WorldWideScience

Sample records for supavej chev kidson

  1. (A. Chev.) Stevels) Exposed to Crude Oil Contaminated Soil

    African Journals Online (AJOL)

    Six accessions of cultivated Okra (Abelmoschuscaillei (A. Chev.) Stevels) and Abelmoschusesculentus (L.) Moench) were evaluated using growth parameters in crude oil contaminated soil. Seeds were collected from collected from Nigerian Institute of Horticulture (NIHORT), Ibadan and from home gardens in Benin City.

  2. A generalized nonlinear tempeature response function for some growth and developmental parameters in kiwifruit (Actinidia deliciosa (A. Chev. C. F. Liang & A. R. Ferguson

    Directory of Open Access Journals (Sweden)

    Streck Nereu Augusto

    2003-01-01

    Full Text Available Temperature is a major factor that affects metabolic processes in living organisms. Thermal time has been widely used to account for the effects of temperature on crop growth and development. However, the thermal time approach has been criticized because it assumes a linear relationship between the rate of crop growth or development and temperature. The response of the rate of crop growth and development to temperature is nonlinear. The objective of this study was to develop a generalized nonlinear temperature response function for some growth and developmental parameters in kiwifruit (Actinidia deliciosa (A. Chev. C. F. Liang & A. R. Ferguson. The nonlinear function has three coefficients (the cardinal temperatures, which were 0ºC, 25ºC, and 40ºC. Data of temperature response of relative growth rate, relative leaf area growth, net photosynthesis rate, and leaf appearance rate in kiwifruit (female cv. Hayward at two light levels, which are from published research, were used as independent data for evaluating the performance of the nonlinear and the thermal time functions. The results showed that the generalized nonlinear response function is better than the thermal time approach, and the temperature response of several growth and developmental parameters in kiwifruit can be described with the same response function.

  3. Trypanocidal properties of Terminalia ivorensis A. Chev ...

    African Journals Online (AJOL)

    The column fractions of the ethyl acetate fraction gave E.D50 value between 1.98 and 5.46 μg/mL for the very active fractions indicating prospect for the development of potential trypanocidal agent from the plant. Keywords: Terminalis ivorensis, Trypanosoma brucei rhodesiensis, trypanocidal. African Journal of Traditional, ...

  4. The orchestration of life, Part 1: the music of the genes | Kidson ...

    African Journals Online (AJOL)

    A new synthesis between genetics, embryology and music is explored in this article. Words, lyrics, molecular biology, embryology, art and composition have been intermingled with the intention of creating atmosphere, while at the same time being informative and maintaining the accuracy of scientific knowledge and musical ...

  5. Contrasting genetic diversity among Oryza longistaminata (A. Chev ...

    African Journals Online (AJOL)

    Molecular markers have been used extensively in studying genetic diversity, genetic relationships and germplasm management. However, the understanding of between and within population genetic variation and how it is partitioned on the basis of geographic origin is crucial as this helps to improve sampling efficiency.

  6. Terminalia Ivorensis A.Chev and Nauclea Diderrichii De Wild

    African Journals Online (AJOL)

    Nekky Umera

    ... in Nauclea diderrichii. Saw dust showed 0% disease incidence and supported the highest plant growth in both .... Plant pathogens and long-term ecosystem changes. Pages ... Mycoplasma disease, Wisconsin, Oct 24:26, 1982. Mc Clelland ...

  7. In vitro viability and preservation of pollen grain of kiwi (Actinidia chinensis var. deliciosa (A. Chev. A. Chev

    Directory of Open Access Journals (Sweden)

    Douglas André Steinmacher

    2011-01-01

    Full Text Available Kiwi is a dioecious plant species, requiring cross pollination for fruit production. The objective of this study was toevaluate the in vitro viability and shelf life of pollen grains of two kiwi varieties. Flowers of the cultivars Matua and Tomuri werecollected and the pollen germinated in vitro, in culture medium containing agar (1 %, sucrose (0, 5, 10, 20 and 40 % and boric acid(0 and 50 mg L-1H3BO3. Pollen grains were stored in a BOD incubator (25.0 °C, refrigerator (4.0 °C, freezer (-18.0 °C and in liquid N2 (-196.0 °C, and evaluated after 0, 40, 120, 240 and 365 days. The culture medium enriched with 12 % sucrose and 50 mgL-1 H3BO3 was the most suitable. Pollen grains can be stored for a short period in the refrigerator or freezer, and cryopreserved for at least one year.

  8. Antibacterial activity of the stem bark of Tieghemella Heckelii Pierre ex. A Chev against methicillin-resistant Staphylococcus aureus.

    Science.gov (United States)

    Kipre, B G; Guessennd, N K; Koné, M W; Gbonon, V; Coulibaly, J K; Dosso, M

    2017-03-27

    Tieghemella heckelii (Sapotaceae) is a medicinal plant used in Africa, particularly in Côte d'Ivoire for treating various diseases including infections. Identification of prospective antibacterial compounds from stem bark of this plant as a result of its medicinal virtue, led to screening activity against methicillin resistant bacteria. Six extracts (hexane, chloroform, ethyl acetate, ethanol, methanol and sterile distilled water) were prepared and tested on methicillin resistant Staphylococcus aureus (MRSA) using broth microdilution method for activity assessment. From this experiment, the minimum inhibitory concentrations (MICs) and minimum bactericidal concentrations (MBCs) of the plant extracts were determined in sterile 96-well microplates in order to search for both bacteriostatic and bactericidal effects. Afterwards, data analysis was performed using GraphPad Prism5 software (One-way ANOVA and Turkey Multiple Comparison test). The results were then presented as Mean ± SD for experiment repeated three times. Four extracts (ethyl acetate, methanol, ethanol and sterile distilled water) showed credible potency, with strong, significant, and moderate growth inhibition of the MRSA tested. The MIC values which varied from 45 μg/mL to 97 μg/mL according to microbial phenotype, resolutely established the activity of the plant extracts. Additionally, the MBC values which varied, depending on the type of bacteria strain, revealed the bacteriostatic and bactericidal effects of the active extracts against Methicillin-resistant Staphylococcus aureus. The present study is a confirmation of the therapeutic potential of Tieghemella heckelii and its promising contribution to the discovery of a novel antibacterial drug pertaining to these resistant strains.

  9. Influence of environmental factors on mineral elements transport and accumulation in leaves and fruits of kiwifruit plants [Actinidia deliciosa (A.Chev.) C.F.Liang et A.R.Ferguson; Basilicata

    International Nuclear Information System (INIS)

    Montanaro, G.; Dichio, B.; Palese, A.M.

    2006-01-01

    In this study, the effect of light availability on actinidia leaf and fruit N, P, K, Ca and Mg accumulation is reported. At fruit-set, exposed and shaded treatments were imposed. Fruit and leaf transpiration was measured using a portable gas exchanges analyser (ADC-LCA4). Sap flow was monitored on whole canes using the Dynagage Sap-Flow (heat balance method). Transpiration of exposed leaves was on average 66% higher than the one of shaded leaves. Sap flow of exposed canes was on average 53 g mE-2 per day; the shadow treatment determined a 60% decrease of sap flow. These differences affected the accumulation of those minerals, notably calcium, which are transported mainly via xylem. Fruit calcium content reached approximately 40 mg fruitE-1 in exposed fruits, while in the shaded ones it was 23 mg fruitE-1. Our results suggest that a greater light availability can promote calcium accumulation. Therefore, the accurate training system management, favouring light interception by canopy and fruits, could be a tool for fruit quality improvement [it

  10. Domestication paysanne des arbres fruitiers forestiers : cas de Coula edulis Bail, Olacaceae, et de Tieghemella heckelii Pierre ex A. Chev., Sapotaceae, autour du Parc National de Taï, Côte d'Ivoire

    NARCIS (Netherlands)

    Bonnéhin, L.

    2000-01-01

    In Côte d'Ivoire agriculture has confined the forest to national parks and state forests. Forest species are disappearing from the rural landscape and the products of these species get ever rarer. Thus, the rural population goes out collecting these products in national parks and state

  11. Browse Title Index

    African Journals Online (AJOL)

    Items 101 - 150 of 695 ... By William J Carmen (2004), Abstract ... J Cooper. Vol 79, No 1 (2008), Book Review Spotter's Guide to Birds of the Bushveld By Saartjie Kidson and Herman van Niekerk (2007), Abstract ... Vol 78, No 1 (2007), Brazza's Martin Phedina brazzae: new information on range and vocalisations, Abstract.

  12. Foliar epidermal characters of some Sterculiaceae species in Nigeria

    African Journals Online (AJOL)

    DR. AWORINDE D.O

    curve and slightly curved. All the species except Cola nitida (Vent) Schott, Malachanta alnifolia (Bak) Pierre, Mansonia altissima (A.Chev) R.Capuron, Theobroma cacao Linn and Waltheria indica Linn are amphistomatic. Stomata types included ...

  13. Browse Title Index

    African Journals Online (AJOL)

    Items 601 - 650 of 1010 ... Vol 2, No 4 (1994), Inventory of cassava plant protection and development ... Chev. under varying levels of plant growth regulators, Abstract .... Using Electrophoretic And Immunochemical Techniques, Abstract PDF.

  14. determination des parametres influents de la dynamique des forets

    African Journals Online (AJOL)

    Administrateur

    Chev. Leguminoseae-Mim. LOL. Loloti. Lannea welwitschii (Hiern) Engl. Anacardiaceae. LON. Lohonfé. Celtis adolphi-frederici Engl. Ulmaceae. LOT. Lotofa. Sterculia rhinopetala K.Schum. Sterculiaceae. MEL. Mélégba. Berlinia confusa Hoyle.

  15. Insects of the Sacarabaeidae family associated with guava (Psidium guajava L. in Ceballos, Ciego de Ávila, Cuba

    Directory of Open Access Journals (Sweden)

    Ioan Alberto Rodríguez Sanatana

    2017-10-01

    Full Text Available Was performed a diagnosis to identify the species of the Scarabaeidae family present in guava cultivation, to determine the distribution and ecological indices of abundance and relative frequency of species associated with the cultivation. The sampling was carried out by light traps, in 35 fields of guava, in five Basic Units of Production and a small property, all belonging to the Ceballos Agroindustrial Enterprise, between May 2013 and June 2015. It was determined that the species of the Scarabaeidae family associated with the cultivation, were Cyclocephala cubana Chap., Phyllophaga patruelis Chev., Phyllophaga puberula Duval, Phyllophaga pilositarsis Blackwelder, Anomala calceata Chev., Strategus sarpedon Burm., Digitonthophagus gazella Fabricius and Dyscinetus picipes Burm. The most abundant species were C. cubana 60% (very abundant and A. calceata Chev. with 10 % (abundant. The species C. cubana, P. patruelis, P. puberula, P. pilositarsis, A. calceata and S. sarpedon, were very frequent, while D. gazella and D. picipes were frequent in guava cultivation.

  16. Reconstruction of sustainable ecosystems on mined lands in the subtropics and tropics of Queensland, Australia

    Energy Technology Data Exchange (ETDEWEB)

    Mulligan, D.; Grigg, A.; Harwood, M. [University of Queensland, Brisbane, Qld. (Australia). Centre for Mined Land Rehabilitation

    1999-07-01

    An overview is presented of results from trial sites of ecosystems that have been established across a range of climatic regimes and a wide variety of soils, tailings, and waste rock materials. The project sites described are four types of open-cut mining operations: the Kidson gold mine, bauxite mines at Weipa, coal mines in the Bowen Basin, and heavy mineral sand mining at North Stradbroke Island. Case studies are presented covering several biological processes, including nutrient cycling, vegetation succession, and seedling recruitment. 10 refs., 5 figs., 3 tabs.

  17. Bidrag til Den Store Danske Encyklopædi

    DEFF Research Database (Denmark)

    Boel, Bent

    2002-01-01

    18 artikler: Edouard Balladur, José Bové, Jean-Pierre Chevènement, Jacques Chirac, Laurent Fabius, Front national, Lionel Jospin, Alain Juppé, Pierre Mauroy, Parti communiste français, Parti socialiste, Charles Pasqua, Jean-Marie Le Pen, Jean-Pierre Raffarin, Rassemblement pour la République...

  18. Effects of Mycorrhiza on the Growth and Productivity of Faidherbia ...

    African Journals Online (AJOL)

    The effects of mycorrhiza on growth and growth components of Faidherbia albida (Del.) A. Chev. was investigated in the semi arid environment of Sokoto State, Nigeria. A complete randomized block design with five replications and factorial combination of three watering regimes (daily for unstressed plant, twice weekly for ...

  19. Influence Of Density On The Durabilities Of Three Ghanaian Timbers ...

    African Journals Online (AJOL)

    Review of factors influencing wood durability shows although density varies depending on trunk position, its role appears controversial for many timber species. Thus, for the first time, the influence of density on the durability of three Ghanaian timbers (Nauclea diderrichii (de Wild.) Merr., Nesogordonia papaverifera (A. Chev ...

  20. Author Details

    African Journals Online (AJOL)

    Bolaji, A. O.. Vol 14, No 2 (2012) - Articles The occurence of a hybrid swarm involving O. longistaminata A. Chev. et Roehr., Oryza glaberrima Steud. and Oryza sativa Linn. in Jebba, Nigeria Abstract PDF. ISSN: 0794-4896. AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for Librarians · for Authors ...

  1. Growth Responses of Two Cultivated Okra Species (Abelmoschus ...

    African Journals Online (AJOL)

    Abelmoschus esculentus was investigated using six accessions; three for each species in crude oil contaminated soil. The seeds ..... industrial waste. Environmental and Experimental. Botany, 52.79-88. Siemonsma, J. S and Hamon, S. (2002). Abelmoschus caillei (A. chev) Stevels. In: Oyen, L.P.A. and. Lemmens R.H.M. ...

  2. Species of beetles (Coleoptera; Scarabaeidae associated to banana (Musa spp. in Ceballos, Ciego de Avila, Cuba

    Directory of Open Access Journals (Sweden)

    Maria Luisa Sisne Luis

    2016-03-01

    Full Text Available A white light trap was placed in bananas plantations, according to Sisne, 2009 and MINAG, 1985, in the Citric enterprise of Ciego de Ávila during the period between May and July of 2010 with the objective of determining the composition of genus and species of the order Coleoptera family Scarabaeidae associated to the agroecosystem. The species Cyclocephala cubana Chapin, Phyllophaga puberula Duval, and Phyllophaga patruelis Chev. are associated to bananas crops in these areas.

  3. Diversité floristique sous canopée en plantation forestière de Mangombe-Edea (Cameroun

    Directory of Open Access Journals (Sweden)

    Makombu, G.

    2010-01-01

    Full Text Available Floristic diversity under canopy in forest plantation of Mangombe-Edea (Cameroon. Trees plantation of Mangombe is situated in rain forest of low altitude. Six plots among which one of Mansonia altissima (A.Chev. A.Chev., 2 of Lovoa trichilioides Harms, 3 of Terminalia ivorensis A.Chev. and one perturbed natural forest are concerned by this study. The work consisted to the evaluation of the floristic diversity under canopy in order to appreciate the influence of forest plantation on natural regeneration. A total of 26 families, 42 genders and 46 species were censured. Meliaceae and Apocynaceae are present in all the plots. In plot one of T. ivorensis, M. altissima and natural forest, the low value of equitability of Pielou traduces the dominance of flora by few species and the transitory situation of the ecosystem. On contrary the rest of plots present a good repartition of individuals among the species. One can notice a weak organization of the ecologic system in M. altissima plot, this corresponds to favourable conditions of environment for installation of many species represented by a few number of individuals. Shannon indices, relatively low in plot one of T. ivorensis characterize an ecosystem where one species is dominant. Globally, the regeneration under canopy is reconstituted progressively and remains less diversified than the nearest natural forest. Creation of genetic pool through selective entertainment under canopy will permit polycyclic management of plots for sustainable production of wood.

  4. Fast neutron irradiation effects on diffusion processes in the aluminum-magnesium system; Effets de l'irradiation aux neutrons rapides sur les phenomenes lies a la diffusion dans le systeme aluminium-magnesium

    Energy Technology Data Exchange (ETDEWEB)

    Moreau, G [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1969-06-01

    Examination of bulky diffusion couples Al (Mg) - Al and Mg (Al) - Mg handled in same thermal conditions (between 200 and 440 C) out of pile and under fast neutron irradiation show, in the latter case: 1 - An increase of the growth kinetics of {beta} phase which can be explained with KIDSON' s formula. 2 - An apparent increase of solubility caused by migration of a part of excess vacancies as complexes (vacancy - solute atom) to sinks (stacking faults, grain boundaries) or to sub-microscopical clusters. 3 - An enhancement of chemical diffusion at low temperature. At infinite dilution, chemical diffusion coefficient of Mg in Al can be expressed in normal conditions as: D = 1 exp(- 31000/RT {+-} 1200/RT cal/mole) cm{sup 2}.s{sup -1} and under irradiation as: D = 8.10{sup -3} exp(-24500/RT {+-} 1200/RT cal/mole) cm{sup 2}.s{sup -1}. Interpretation can be carried out by DIENES and Damask's theory. Excess defects (vacancies and interstitials generated in equal numbers by radiation) annihilate by migration to sinks and by direct recombination. Sinks density varies with temperature and irradiation time. The part of complexes (vacancy-solute atom) is important in the vacancies annealing kinetics. (author) [French] L'examen de couples de diffusion massifs Al (Mg) - Al et Mg (Al) - Mg traites dans les memes conditions thermiques (entre 200 et 440 C) hors pile et sous flux de neutrons rapides montre dans le dernier cas: 1 - Une acceleration de la cinetique de croissance de la phase {beta} a basse temperature dont on peut rendre compte a l'aide de la formule de KIDSON. 2 - Une augmentation apparente de la solubilite due a l'elimination d'une partie des lacunes en exces sous forme de complexes (lacune -solute) sur des pieges (dislocations, joints) ou sous forme d'amas sub-microscopiques. 3 - Une acceleration de la diffusion a basse temperature. A dilution infinie la diffusion (en cm{sup 2}/s) du Mg dans l'Al passe de: 1 exp(- 31000/RT {+-} 1200/RT cal/mole) a 8.10{sup -3} exp

  5. Scarabaeidae species associate to guava ( Psidium guajava L. in Ciego de Ávila, Cuba

    Directory of Open Access Journals (Sweden)

    Maria Luisa Sisne Luis

    2013-01-01

    Full Text Available Se colocó una trampa de luz blanca en las plantaciones de la Guayaba (Psidium guajava L., según establece Sisne, 2009 y MINAG, 1985, en la Empresa Cítricos de Ciego de Ávila durante el período comprendido entre mayo y julio del año 2010 con el objetivo de determinar la composición de géneros y especies del orden Coleoptera familia Scarabaeidae asociadas al agroecosistema. Se determinó que las especies Cyclocephala cubana Chapin, Phyllophaga puberula Duval, y Phyllophaga patruelis Chev. están asociadas al cultivo de la Guayaba en estas áreas.

  6. A propos du dernier livre de Sebastian Roché, Police de proximité, Nos politiques de sécurité, Paris, Seuil, 2005

    OpenAIRE

    Hassid, Olivier

    2006-01-01

    Les émeutes urbaines de novembre 2005 viennent de relancer le débat sur la nécessité de disposer d’une police de proximité. Mise en place par Jean-Pierre Chevènement et stoppée par Nicolas Sarkozy, la réforme de la police de proximité est, pour de nombreux observateurs, indispensable au maintien du pacte républicain. La sortie du livre de Sebastian Roché est, en ce sens, une aubaine pour le décideur public. L’objectif de ce livre est simple : éclairer celui-ci sur les causes de l’échec de cet...

  7. A propos du dernier livre de Sebastian Roché, Police de proximité, Nos politiques de sécurité, Paris, Seuil, 2005.

    OpenAIRE

    Hassid, Olivier

    2018-01-01

    Les émeutes urbaines de novembre 2005 viennent de relancer le débat sur la nécessité de disposer d’une police de proximité. Mise en place par Jean-Pierre Chevènement et stoppée par Nicolas Sarkozy, la réforme de la police de proximité est, pour de nombreux observateurs, indispensable au maintien du pacte républicain. La sortie du livre de Sebastian Roché est, en ce sens, une aubaine pour le décideur public. L’objectif de ce livre est simple : éclairer celui-ci sur les causes de l’échec de cet...

  8. Palaeocirculation across New Zealand during the last glacial maximum at ˜21 ka

    Science.gov (United States)

    Lorrey, Andrew M.; Vandergoes, Marcus; Almond, Peter; Renwick, James; Stephens, Tom; Bostock, Helen; Mackintosh, Andrew; Newnham, Rewi; Williams, Paul W.; Ackerley, Duncan; Neil, Helen; Fowler, Anthony M.

    2012-03-01

    What circulation pattern drove Southern Alps glacial advances at ˜21 ka? Late 20th century glacial advances in New Zealand are commonly attributed to a dual precipitation increase and cooler than normal temperatures associated with enhanced westerly flow that occur under synoptic pressure patterns termed 'zonal' regimes (Kidson, 2000). But was the circulation pattern that supported major Southern Alps glacial advances during the global LGM similar to the modern analog? Here, a Regional Climate Regime Classification (RCRC) time slice was used to infer past circulation for New Zealand during the LGM at ˜21 ka. Palaeoclimate information that supported the construction of the ˜21 ka time slice was derived from the NZ-INTIMATE Climate Event Stratigraphy (CES), one new Auckland maar proxy record, and additional low-resolution data sourced from the literature. The terrestrial evidence at ˜21 ka implicates several possibilities for past circulation, depending on how interpretations for some proxies are made. The interpretation considered most tenable for the LGM, based on the agreement between terrestrial evidence, marine reconstructions and palaeoclimate model results is an 'anticyclonic/zonal' circulation regime characterized by increased influences from blocking 'highs' over the South Island during winter and an increase in zonal and trough synoptic types (with southerly to westerly quarter wind flow) during summer. These seasonal circulation traits would have generated lower mean annual temperatures, cooler than normal summer temperatures, and overall lower mean annual precipitation for New Zealand (particularly in the western South Island) at ˜21 ka. The anticyclonic/zonal time slice reconstruction presented in this study has different spatial traits than the late 20th Century and the early Little Ice Age signatures, suggesting more than one type of regional circulation pattern can drive Southern Alps glacial activity. This finding lends support to the hypothesis

  9. Antinociceptive Effect of Tephrosia sinapou Extract in the Acetic Acid, Phenyl-p-benzoquinone, Formalin, and Complete Freund’s Adjuvant Models of Overt Pain-Like Behavior in Mice

    Directory of Open Access Journals (Sweden)

    Renata M. Martinez

    2016-01-01

    Full Text Available Tephrosia toxicaria, which is currently known as Tephrosia sinapou (Buc’hoz A. Chev. (Fabaceae, is a source of compounds such as flavonoids. T. sinapou has been used in Amazonian countries traditional medicine to alleviate pain and inflammation. The purpose of this study was to evaluate the analgesic effects of T. sinapou ethyl acetate extract in overt pain-like behavior models in mice by using writhing response and flinching/licking tests. We demonstrated in this study that T. sinapou extract inhibited, in a dose (1–100 mg/kg dependent manner, acetic acid- and phenyl-p-benzoquinone- (PBQ- induced writhing response. Furthermore, it was active via intraperitoneal, subcutaneous, and peroral routes of administration. T. sinapou extract also inhibited formalin- and complete Freund’s adjuvant- (CFA- induced flinching/licking at 100 mg/kg dose. In conclusion, these findings demonstrate that T. sinapou ethyl acetate extract reduces inflammatory pain in the acetic acid, PBQ, formalin, and CFA models of overt pain-like behavior. Therefore, the potential of analgesic activity of T. sinapou indicates that it deserves further investigation.

  10. Identité et écologie des espèces forestières commerciales d'Afrique centrale : le cas de Milicia spp. (synthèse bibliographique

    Directory of Open Access Journals (Sweden)

    Daïnou, K.

    2012-01-01

    Full Text Available Identity and ecology of Central African timber tree species: the case of Milicia spp., a review. Iroko designates the two African tree species Milicia excelsa (Welw. C.C.Berg and Milicia regia (A.Chev. C.C.Berg known as highly valuable in the timber trade. Despite its economical importance and a decrease in population densities due to exploitation, there is a significant lack of ecological and sylvicultural knowledge required for a sustainable management of iroko. In West Africa, M. excelsa has received more attention from scientists than M. regia, but several topics clearly need further investigations or outcomes cannot be transferred in the context of Central African rainforests. A first thing to verify is whether speciation really occurred in the genus Milicia: morphological differences between the two species are very low, and a revision in this genus may lead to some rearrangements of conservatory and management policies related to this taxonomic group. Furthermore, (i patterns related to the reproductive phenology and its controlling factors, (ii gene flow among and between populations and individuals regarding life history traits, influence of human activities and paleoecological perturbations, and (iii dynamics of seedling populations are among aspects that require emphasis in order to propose efficient tools for forest managers. Unless scientists provide these crucial data, the abundance of iroko in tropical rainforests will only depend on expensive plantations activities.

  11. Anti-Fungal Activity and Allelopathic Influence of Vitex agnus-castus L. (Verbenaceae Essential Oils on Actinidia deliciosa in vitro Culture

    Directory of Open Access Journals (Sweden)

    N. Ya. Levchyk

    2016-12-01

    Full Text Available The results of research of Vitex agnus-castus L. plants from the collection of M. M. Gryshko National Botanical Garden, NAS of Ukraine are given. The species belongs to a group of prospective essential oil plants which are characterized by valuable medicinal, food, aromatic, honey, technical and decorative properties, and can be used in many industries, including pharmaceutical, cosmetic and food. The quantitative content and qualitative composition of the vegetating plant’s essential oil are determined, its antifungal influence on the cultures of Aspergillus niger, Alternaria alternatа andFusarium culmorum is assessed. Antifungal properties of V. agnus-castus essential oil were used to sterilize Actinidia deliciosa (A. Chev C.F. Liang & A.R. Fergusonexplants introduced in vitro. V. agnus-castusessential oil is shown to have allelopathic effect on A. deliciosa plants. The possibility of using the oil in vitro to cultivate A. deliciosa callus as a source of bioactive substances and to enhance the effectiveness of biotechnological methods of plant propagation is discussed.

  12. Determination and validation of mTOR kinase-domain 3D structure by homology modeling

    Directory of Open Access Journals (Sweden)

    Lakhlili W

    2015-07-01

    Full Text Available Wiame Lakhlili,1 Gwénaël Chevé,2 Abdelaziz Yasri,2 Azeddine Ibrahimi1 1Laboratoire de Biotechnologie (MedBiotech, Faculté de Médecine et de Pharmacie de Rabat, Université Mohammed V de Rabat, Rabat, Morroco; 2OriBase Pharma, Cap Gamma, Parc Euromédecine, Montpellier, France Abstract: The AKT/mammalian target of rapamycin (mTOR pathway is considered as one of the commonly activated and deregulated signaling pathways in human cancer. mTOR is associated with other proteins in two molecular complexes: mTOR complex 1/Raptor and the mTOR complex 2/Rictor. Using the crystal structure of the related lipid kinase PI3Kγ, we built a model of the catalytic region of mTOR. The modeling of the three-dimensional (3D structure of the mTOR was performed by homology modeling program SWISS-MODEL. The quality and validation of the obtained model were performed using PROCHECK and PROVE softwares. The overall stereochemical property of the protein was assessed by the Ramachandran plot. The model validation was also done by docking of known inhibitors. In this paper, we describe and validate a 3D model for the mTOR catalytic site.Keywords: mTOR, homology modeling, mTOR kinase-domain, docking

  13. Effects of Hydrogen Cyanamide on the Floral Morphogenesis of Kiwifruit Buds Efectos de la Cianamida de Hidrógeno sobre la Morfogénesis Floral de Kiwi

    Directory of Open Access Journals (Sweden)

    Hakan Engin

    2010-09-01

    Full Text Available The influence of hydrogen cyanamide (HC on the flower bud development of kiwifruit (Actinidia deliciosa (A. Chev. C.F. Liang & A.R. Ferguson. ‘Hayward’ was studied. The bud samples were taken every 5-10 d starting from dormant season (March and fixed in FAA (10% formalin, 50% ethanol, 5% glacial acetic acid. Flower bud development was compared in three HC concentrations and the control. 1%, 2%, and 3% of HC was applied 35 d before the expected natural bud break. During the onset of bud break, only 57.6% of control buds had sepal primordia developed. On the other hand, HC treated buds had almost completed their stamen formation and started stigma primordia. When the control vines were in advanced bud break, gynoecial plateau already began to form in the vines treated with 2 and 3% HC. Vines treated with 1% HC lagged a little behind and had not started developing the gynoecial plateau. As the bud developed from the open cluster to the tight bud stage, the differences between the control and HC treated plants were more distinct. However, there were no differences between HC treatments as the ovule initiation took place in the buds.El presente estudio evalúa la influencia de la aplicación de cianamida de hidrogeno (HC sobre el desarrollo de las yemas florales de kiwi (Actinidia deliciosa (A. Chev. C.F. Liang & A.R. Ferguson cv. Hayward. Las muestras de yemas se tomaron cada 5-10 días comenzando en la época de dormancia en marzo y se fijaron en FAA (10% formaldehido, 50% etanol, 5% ácido acético glacial. Se comparó el desarrollo de las yemas florales en tres concentraciones de HC y el control. Se aplicó HC al 1%, 2% y 3% 35 días antes del brote natural de las yemas. En el momento de la apertura de las yemas, sólo el 57,6% de las yemas de control habían desarrollado los primordios de los sépalos. Por el contrario, las yemas tratadas con HC casi habían completado la formación de estambres y habían empezado el desarrollo de primordios

  14. Possible climate warming effects on vegetation, forests, biotic (insect, pathogene) disturbances and agriculture in Central Siberia for 1960- 2050

    Science.gov (United States)

    Tchebakova, N. M.; Parfenova, E. I.; Soja, A. J.; Lysanova, G. I.; Baranchikov, Y. N.; Kuzmina, N. A.

    2012-04-01

    Regional Siberian studies have already registered climate warming over the last half a century (1960-2010). Our analysis showed that winters are already 2-3°C warmer in the north and 1-2°C warmer in the south by 2010. Summer temperatures increased by 1°C in the north and by 1-2°C in the south. Change in precipitation is more complicated, increasing on average 10% in middle latitudes and decreasing 10-20% in the south, promoting local drying in already dry landscapes. Our goal was to summarize results of research we have done for the last decade in the context of climate warming and its consequences for biosystems in Central Siberia. We modeled climate change effects on vegetation shifts, on forest composition and agriculture change, on the insect Siberian moth (Dendrolimus suprans sibiricus Tschetv) and pathogene (Lophodermium pinastri Chev) ranges in Central Siberia for a century (1960-2050) based on historical climate data and GCM-predicted data. Principal results are: In the warmer and drier climate projected by these scenarios, Siberian forests are predicted to decrease and shift northwards and forest-steppe and steppe ecosystems are predicted to dominate over 50% of central Siberia due to the dryer climate by 2080. Permafrost is not predicted to thaw deep enough to sustain dark (Pinus sibirica, Abies sibirica, and Picea obovata) taiga. Over eastern Siberia, larch (Larix dahurica) taiga is predicted to continue to be the dominant zonobiome because of its ability to withstand continuous permafrost. The model also predicts new temperate broadleaf forest and forest-steppe habitats; At least half of central Siberia is predicted to be climatically suitable for agriculture at the end of the century although potential croplands would be limited by the availability of suitable soils agriculture in central Siberia would likely benefit from climate warming Crop production may twofold increase as climate warms during the century; traditional crops (grain, potato

  15. Outcomes of the distal intraarticular humeral fractures treated by olecranon osteotomy

    Directory of Open Access Journals (Sweden)

    Erhan Yılmaz

    2009-01-01

    Full Text Available Objectives: To evaluate the management and outcome of intraarticular fractures of the distal humerus treated by open reduction and internal fixation using the olecranon osteotomy technique. Materials and methods: Twenty-one patients with in-traarticular fractures of the distal humerus were treated by open reduction and internal fixation. The mean age of the patients was 41.6 years and the mean follow-up pe-riod was 25.3 months. All fractures were type C accord-ing to the AO/ASIF fracture classification system. Chev-ron type olecranon osteotomy was performed within 12-24 h after the injury in all cases but 4 of them. Physical and radiological examination of patients with the appro-priate range checks were made.Results: All fractures united within average duration of 3.2 months. Excellent or good results were found in pa-tients less than 50 years-old, in women, when passing time from injury to surgery was within 12 hours and when early mobilization was achieved. The complica-tions were seen as 2 (9.6% transient neuropraxia of the ulnar nerve, 2 (9.6% failure of fixation, 1 (4.8% het-erotopic ossification and 1 (4.8% olecranon non-union. Fracture type (C1 and time from occurrence of injury to surgery (<12 hours are the main prognostic factors for achieving the excellent/ good functional results.Conclusions: The critical factors for a successful out-come of intraarticular fractures of the distal humerus in-cluded meticulous surgical technique, stable internal fix-ation, surgical experimentation and early controlled postoperative mobilization.

  16. Allelopathic effects of the invasive Prosopis juliflora (Sw. DC. on selected native plant species in Middle Awash, Southern Afar Rift of Ethiopia

    Directory of Open Access Journals (Sweden)

    Samuel Getachew

    2012-12-01

    Full Text Available The allelopathic effects of the invasive Prosopis juliflora (Sw. DC. was studied on seed germination and seedling growth of Acacia nilotica(L. Willd. ex Del., Acacia tortilis (Forssk. Hayne, Cenchrus ciliaris L. and Enteropogon rupestris (J.A. Schmidt A. Chev. Vegetation sampling in different habitat types in the area was made to identify the target plant species. Comparison of canopy characteristics among P. juliflora, A. nilotica and A. tortilis was also made to observe differences if any in canopy closure. P. juliflora was recorded in all habitat types in highest density and observed affecting the plant diversity there in. Its growth characteristics and dense thicket formation restrict light to the ground flora and hence diminishes plant diversity. Leaf, bark and root aqueous extract of P. juliflora at 0, 0.5, 0.8, 1, 2 and 6% wereprepared and their effect studied on germination percentage and seedling growth of the study plant species. Germination of A. nilotica and A. tortilis was not affected by all aqueous extracts of different organ parts of P. juliflora while leaf and root extracts at higher concentrations inhibited germination of C. ciliaris and E. rupestris. Shoot and root growth of the study species were inhibited by leaf and root at higher concentrations. Seed germination of all species except A. nilotica was inhibited by soil amended with decaying plant parts and under canopy soil. The effect is species specific and annuals (grasses and herbs were affected more than perennials. Leaf seems to contain greater number/amount of inhibitors than does root and bark. Bark seems to contain the least. Heavy accumulation of toxic substances at under canopy soil of P. juliflora may be one of the reasons for its invasiveness and low plant diversity.

  17. Propostas marxistas de educação estética: aproximações e afastamentos em torno do fenômeno da catarse - doi: 10.5007/2175-795X.2011v29n2p699

    Directory of Open Access Journals (Sweden)

    Vitor Marcel Schühli

    2011-06-01

    formação do indivíduo, a partir de teorias que apostam na possibilidade de a arte impulsionar a transformação sobre a realidade e contribuir para a superação da alienação. Foram analisadas as teorias de educação estética dos autores marxistas L. G. Iuldáchev, B. M. Teplov, e A. Sánchez Vázquez. No recorte aqui proposto, buscou-se demonstrar que, apesar de os três autores partirem de uma concepção histórico-social de individualidade, suas formulações diferem no que diz respeito à abordagem do fenômeno da catarse. Na dialética entre identifi cação e distanciamento do sujeito com o objeto artístico, a ênfase dos autores sobre um ou outro momento da relação acaba por marcar sua posição em torno do fenômeno da catarse. Enquanto em Iuldachév e em Teplov pode-se dizer que encontra destaque o momento da identifi cação, Sánchez Vázquez busca com o conceito de situação estética recuperar a importância do distanciamento nessa relação. Acredita-se que estudar as formulações desses teóricos pode iluminar as refl exões atuais sobre a educação estética, bem como auxiliar, com sua perspectiva materialista e dialética, a crítica aos estudos que absolutizam o papel da consciência no projeto de transformação social.

  18. Analysis of the ArcA regulon in anaerobically grown Salmonella enterica sv. Typhimurium

    Directory of Open Access Journals (Sweden)

    Porwollik Steffen

    2011-03-01

    Full Text Available Abstract Background Salmonella enterica serovar Typhimurium (S. Typhimurium is a Gram-negative pathogen that must successfully adapt to the broad fluctuations in the concentration of dissolved dioxygen encountered in the host. In Escherichia coli, ArcA (Aerobic Respiratory Control helps the cells to sense and respond to the presence of dioxygen. The global role of ArcA in E. coli is well characterized; however, little is known about its role in anaerobically grown S. Typhimurium. Results We compared the transcriptional profiles of the virulent wild-type (WT strain (ATCC 14028s and its isogenic arcA mutant grown under anaerobic conditions. We found that ArcA directly or indirectly regulates 392 genes (8.5% of the genome; of these, 138 genes are poorly characterized. Regulation by ArcA in S. Typhimurium is similar, but distinct from that in E. coli. Thus, genes/operons involved in core metabolic pathways (e.g., succinyl-CoA, fatty acid degradation, cytochrome oxidase complexes, flagellar biosynthesis, motility, and chemotaxis were regulated similarly in the two organisms. However, genes/operons present in both organisms, but regulated differently by ArcA in S. Typhimurium included those coding for ethanolamine utilization, lactate transport and metabolism, and succinate dehydrogenases. Salmonella-specific genes/operons regulated by ArcA included those required for propanediol utilization, flagellar genes (mcpAC, cheV, Gifsy-1 prophage genes, and three SPI-3 genes (mgtBC, slsA, STM3784. In agreement with our microarray data, the arcA mutant was non-motile, lacked flagella, and was as virulent in mice as the WT. Additionally, we identified a set of 120 genes whose regulation was shared with the anaerobic redox regulator, Fnr. Conclusion(s We have identified the ArcA regulon in anaerobically grown S. Typhimurium. Our results demonstrated that in S. Typhimurium, ArcA serves as a transcriptional regulator coordinating cellular metabolism, flagella

  19. Changes in transcription of cytokinin metabolism and signalling genes in grape (Vitis vinifera L.) berries are associated with the ripening-related increase in isopentenyladenine.

    Science.gov (United States)

    Böttcher, Christine; Burbidge, Crista A; Boss, Paul K; Davies, Christopher

    2015-09-16

    Cytokinins are known to play an important role in fruit set and early fruit growth, but their involvement in later stages of fruit development is less well understood. Recent reports of greatly increased cytokinin concentrations in the flesh of ripening kiwifruit (Actinidia deliciosa (A. Chev.) C.F. Liang & A.R. Ferguson) and grapes (Vitis vinifera L.) have suggested that these hormones are implicated in the control of ripening-related processes. A similar pattern of isopentenyladenine (iP) accumulation was observed in the ripening fruit of several grapevine cultivars, strawberry (Fragaria ananassa Duch.) and tomato (Solanum lycopersicum Mill.), suggesting a common, ripening-related role for this cytokinin. Significant differences in maximal iP concentrations between grapevine cultivars and between fruit species might reflect varying degrees of relevance or functional adaptations of this hormone in the ripening process. Grapevine orthologues of five Arabidopsis (Arabidopsis thaliana L.) gene families involved in cytokinin metabolism and signalling were identified and analysed for their expression in developing grape berries and a range of other grapevine tissues. Members of each gene family were characterised by distinct expression profiles during berry development and in different grapevine organs, suggesting a complex regulation of cellular cytokinin activities throughout the plant. The post-veraison-specific expression of a set of biosynthesis, activation, perception and signalling genes together with a lack of expression of degradation-related genes during the ripening phase were indicative of a local control of berry iP concentrations leading to the observed accumulation of iP in ripening grapes. The transcriptional analysis of grapevine genes involved in cytokinin production, degradation and response has provided a possible explanation for the ripening-associated accumulation of iP in grapes and other fruit. The pre- and post-veraison-specific expression of

  20. Arabinogalactan proteins in plants

    Directory of Open Access Journals (Sweden)

    Ewa Szczuka

    2013-04-01

    Full Text Available AGPs (arabinogalactan-proteins are the major constituent of arabic gum and have been used as emulsifiers and stabilizing agents. They are also one of the most abundant and heterogeneous class forming a large family of proteoglycans that sculpt the surface not only of plant but also of all eukaryotic cells. Undoubtedly, AGPs appear in numerous biological processes, playing diverse functions. Despite their abundance in nature and industrial utility, the in vivofunction(s of AGPs still remains unclear or even unknown. AGPs are commonly distributed in different plant organs and probably participate in all aspects of plant growth and development including reproduction (e.g. they are present in the stigma including stigma exudates, and in transmitting tissues in styles, pollen grains, and pollen tubes. The functions and evident involvement of AGPs in sexual plant reproduction in a few plant species as Actinidia deliciosa (A.Chev. C.F.Liang & A.R.Ferguson, Amaranthus hypochondriacus L., Catharanthus roseus (L. G.Don, Lolium perenneL. and Larix deciduaMill. are known from literature. The localization of two kinds of AGP epitopes, recognized by the JIM8 and JIM13 mAbs, in anatomically different ovules revealed some differences in spatial localization of these epitopes in ovules of monocots Galanthus nivalis L. and Galtonia candicans (Baker Decne. and dicots like Oenothera species and Sinapis albaL. A detailed study of the localization of AGPs in egg cells, zygotes, including the zygote division stage, and in two-celled proembryos in Nicotiana tabacumL. prompts consideration of the necessity of their presence in the very early steps of ontogenesis. The selective labeling obtained with AGP mAbs JIM8, JIM13, MAC207, and LM2 during Arabidopsis thaliana(L. Heynh. development suggests that some AGPs can be regarded as molecular markers for gametophytic cell differentiation. Moreover, the results show evident differences in the distribution of specific AGP

  1. Influence of tropical leaf litter on nitrogen mineralization and community structure of ammonia-oxidizing bacteria

    Directory of Open Access Journals (Sweden)

    Diallo, MD.

    2015-01-01

    Full Text Available Description of the subject. The present study concerns the relationships among leaf litter decomposition, substrate quality, ammonia-oxidizing bacteria (AOB community composition and nitrogen (N availability. Decomposition of organic matter affects the biogeochemical cycling of carbon (C and N. Since the composition of the soil microbial community can alter the physiological capacity of the community, it is timely to study the litter quality effect on N dynamic in ecosystems. Objectives. The aim of this study was to determine the influence of leaf litter decomposition on N mineralization. The specific objectives of this study were to evaluate the influence of the litter biochemistry of five plants species (Faidherbia albida A.Chev., Azadirachta indica A.Juss., Casuarina equisetifolia L., Andropogon gayanus Kunth and Eragrostis tremula Hochst. ex Steud. on N mineralization in a tropical ferrous soil (Lixisol, nitrification, and genetic diversity of ammonia-oxidizing bacteria. Denaturing gradient gel electrophoresis (DGGE of amplified fragments of genes coding for 16S rRNA was used to study the development of bacterial communities during decomposition of leaf litter in soils. Method. Community structure of AOB was determined at two time periods: day 0 and day 140. Ten strains were tested and each of these strains produced a single band. Thus, DGGE DNA band patterns were used to estimate bacterial diversity. Plant secondary compounds such as polyphenols are purported to influence nutrient cycling by affecting organic matter degradation, mineralization rates, N availability and humus formation. In a laboratory study, we investigated the influence of six phenolic acids (ferulic, gallic, vanillic, syringic, p-coumaric and p-HBA acids commonly found in the plant residues on N mineralization and NH4+ and NO3- production in soils. Results. The results showed that litter type did affect soil nitrification. Faidherbia albida litter was associated with

  2. Light quality management in fruit orchards: physiological and technological aspects Manejo de la calidad de la luz en huertos frutales: Aspectos fisiológicos y tecnológicos

    Directory of Open Access Journals (Sweden)

    Richard M. Bastías

    2012-12-01

    Full Text Available Light quality (sunlight spectrum management promises to provide a new technological alternative to sustainable production in horticultural crops. However, little information exists about physiological and technological aspects on light quality management in fruit crops. Sunlight composition changes widely in orchard canopies, inducing different plant responses in fruit trees mediated by phytochrome (PHY and cryptochrome (CRY activity. High proportion of far-red (FR in relation to red (R light increases shoot elongation, while blue (B light induces shoot dwarfing. Red and ultraviolet (UV light increases fruit skin anthocyanin synthesis, while FR light shows a negative effect. Red and B light can also alter leaf morpho-physiological traits in fruit trees, such palisade thickness, stomatal aperture, and chlorophyll content. Besides improvement of photosynthetically active radiation (PAR availability, the use of reflective films improves UV and R light proportion, with positive effects on PHY mediated-responses (fruit color, fruit weight, shoot growth, as reported in apple (Malus domestica Borkh., peach (Prunus persica (L. Batsch, and sweet cherry (Prunus avium (L. L.. Colored nets widely alter spectral light composition with effects on plant growth, yield, and quality in apple, kiwifruit (Actinidia deliciosa A. Chev. C.F. Liang & A.R. Ferguson, peach, and blueberry (Vaccinium corymbosum L. orchards. Mechanisms of colored nets seem to be associated to photosynthetic and morphogenetic process regulated by PAR availability, R/B light proportion, and CRY activity. Alteration of light quality affects significantly fruit tree plant responses and could be a useful tool for sustainable (e.g. lower use of chemicals and labor-practices management of yield and quality in modern orchards.El manejo de la calidad de la luz (espectro de la luz solar promete proveer una nueva alternativa tecnológica para la producción sostenible de cultivos hortícolas. Sin

  3. ALOGAMIA EM ARROZ (Oryza sativa L. E RELAÇÃO COM CARACTERÍSTICAS AGRONÔMICAS RICE (Oryza sativa L. ALLOGAMY AND RELATIONSHIP WITH AGRONOMIC TRAITS

    Directory of Open Access Journals (Sweden)

    Péricles de Carvalho Ferreira Neves

    2007-09-01

    Full Text Available

    A produção de sementes híbridas de arroz, utilizando a técnica chinesa, requer uma grande quantidade de mão-de-obra e é cara. Alternativas para aumentar a taxa de polinização cruzada podem ajudar a reduzir tal custo. A Embrapa Arroz e Feijão desenvolve um projeto de produção de híbridos através da transferência de caracteres alogâmicos (comprimento de estigma e antera da Oryza longistaminata A. Chev. para a cultivada Oryza sativa L. O objetivo deste estudo foi determinar as correlações genética e fenotípica entre esses caracteres e os agronômicos. O. longistaminata foi cruzada com a O. sativa e retrocruzada duas vezes para a cultivada. Foram obtidas 25 linhagens F3:6 e estudadas as correlações entre os caracteres alogâmicos (comprimento de estigma, antera e espigueta e os agronômicos (comprimento de estigma, antera, espigueta, arista e panícula, esterilidade, degrane, altura de planta, perfilhos por planta, e exserção de panícula. O desenho experimental utilizado foi o de blocos ao acaso com quatro repetições. Os ensaios foram conduzidos em dois locais dentro da área experimental da Embrapa Arroz e Feijão. Em geral, foram observadas pequenas correlações genética e fenotípica entre caracteres alogâmicos e agronômicos. Elevada e significativa associação foi observada entre o comprimento de estigma e o de anteras, o comprimento de estigma e o de arista, o comprimento de antera e o de arista, e o comprimento de panícula e a altura de planta.

    PALAVRAS-CHAVE: Oryza longistaminata; taxa de autopolinização; arroz híbrido; produção de sementes.

  4. La ética hacia el futuro

    Directory of Open Access Journals (Sweden)

    Jaime Campos

    1993-08-01

    Full Text Available

    El honor y la responsabilidad de haber sido elegido presidente del Círculo André Lambling me han conducido a reflexiones intelectuales sobre la moral en general y las éticas en particular, que han dado como resultado más interrogantes que respuestas.

    Comienzo por analizar dos hechos concretos: primero, el espíritu abierto de los miembros del Círculo que permitió a un médico no europeo orientar temporalmente esta asociación pluricultural construida alrededor de la inteligencia y del saber, y en segundo lugar un informe de Noelle Lenoir, dirigido al ex primer Ministro Francés Michel Rocard sobre una “ética biomédica a la francesa” que, en el capítulo dedicado a las relaciones Norte,c;ur, escribe: “Laética en los países pobres debería primero consistir en hacer llegar a la población los cuidados básicos, una higiene de vida aceptable, una alimentación sufIciente”, pero la divergencia de ideas está también presente en el seno de la alta burocracia, puesto que según el señor Chevénement “En todo el mundo hay que mantener referencia a valores universales”, porque la preservación de la vida, la búsqueda del bienestar y el amor por el conocimiento pertenecen a la humanidad. He juzgado entonces necesario consultar algunos autores a los cuales hago referencia, que influyeron de una u otra forma en esta exposición.

    Yo considero que en materia de ética, así como en varios campos del saber, lo absoluto no existe y es bueno recordar que, durante siglos, la moral ha estado basada en el resentimiento, en el placer de la delación, y hasta en el odio. Por esta razón, la moral no puede conceder ninguna autoridad ni ningún poder, porque como lo manifestó Sartre: “Un acto no es moral sino cuando es libre”.

    En la actualidad los debates sociales transcurren a través de los medios de comunicación en donde predomina la dictadura de la imagen, imagen que ha invadido nuestro espacio social y nuestras

  5. Study of Bud Differentiation in Hayward and Tomuri Cultivars of Kiwifruit

    Directory of Open Access Journals (Sweden)

    Ebrahim Abedi gheshlaghi

    2017-12-01

    Full Text Available Introduction: It is important to understand the structural events associated with flower morphogenesis in horticultural plants, because it has many aspects of practical horticultural significance. Information about different stages of flower initiation and development is important for better management of the vineyardsand fruit set. Knowledge of floral ontogeny in kiwifruit is also important for the establishment of breeding programs and for the understanding of the evolutionary processes involved in the development of the floral organs. The main objective of this study was documentation of the differentiation stages of flower buds for better understanding of morphological and external changes in (Actinidiadeliciosa[A. Chev.] C.F. Liang &A.R. Ferguson var.deliciosa cvs.Hayward (female and Tomuri (male. Materials and Methods: The experiment was carried out over two years in a mature 'Hayward' and ‘Tomuri’ kiwifruit vineyard at the Citrus and Subtropical Research Center of Iran (Ramsar city. Pistillate and staminate flowers development was followed from the stage of undifferentiated primordia, present in the axils of leaf primordia in dormant buds since mid-March to early June 2015 and 2016. Equally buds in diameter and size from sixth to twentieth buds on one-year old cane of Hayward and Tomuri selected at 5 to 7 days intervals. They were sampled and fixed in a solution of formalin, ethanol 70%, glacial acetic acid (2:5:1 FAA then stored in refrigerator. Fifteen buds of each sample dissected under a Nikon SMZ645 stereo zoom microscope. The very dense pubescence within the buds was removed manually without damaging the axillary flower primordia. The remaining pubescence was removed using dissecting needles. Various stages of flower differentiation were explained with principal growth stage 5 of BBCH scale. Results and Discussion: The first signs of the flower on Tomuri were observed 2 days before bud swelling stage (01, on the March 12th