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1

Transport of Indole-3-Acetic Acid during Gravitropism in Intact Maize Coleoptiles 1  

UK PubMed Central (United Kingdom)

We have investigated the transport of tritiated indole-3-acetic acid (IAA) in intact, red light-grown maize (Zea mays) coleoptiles during gravitropic induction and the subsequent development...Full Text Available

1990-12-01

2

Oxygen-dependent catabolism of indole-3-acetic acid in Bradyrhizobium japonicum.  

UK PubMed Central (United Kingdom)

Some strains of Bradyrhizobium japonicum have the ability to catabolize indole-3-acetic acid (IAA). Examination of this catabolism in strain 110 by in vivo experiments has revealed an enzymatic activity...Full Text Available

1991-08-01

3

Indole-3-Acetic Acid Biosynthesis in Colletotrichum gloeosporioides f. sp. aeschynomene  

UK PubMed Central (United Kingdom)

We characterized the biosynthesis of indole-3-acetic acid by the mycoherbicide Colletotrichum gloeosporioides f. sp. aeschynomene. Auxin production was tryptophan dependent....Full Text Available

1998-12-01

4

Free and Conjugated Indole-3-Acetic Acid in Developing Bean Seeds 1  

UK PubMed Central (United Kingdom)

The changes in conjugated indole-3-acetic acid (IAA) levels compared to the levels of free IAA have been analyzed during the development of bean (Phaseolus vulgaris L.) seed using quantitative...Full Text Available

1989-10-01

5

Arabidopsis thaliana auxotrophs reveal a tryptophan-independent biosynthetic pathway for indole-3-acetic acid.  

UK PubMed Central (United Kingdom)

We used tryptophan auxotrophs of the dicot Arabidopsis thaliana (wall cress) to determine whether tryptophan has the capacity to serve as a precursor to the auxin, indole-3-acetic acid (IAA). Quantitative...Full Text Available

1993-11-01

6

Abscisic Acid Alters the Metabolism of Indole-3-Acetic Acid in Senescing Flowers of Cucumis melo L  

UK PubMed Central (United Kingdom)

Experiments were conducted to investigate indole-3-acetic acid (IAA) and abscisic acid (ABA) metabolism associated with postanthesis senescence of ovaries from nonpollinated muskmelon (Cucumis...Full Text Available

1990-11-01

7

The Decrease in Auxin Polar Transport Down the Lupin Hypocotyl Could Produce the Indole-3-Acetic Acid Distribution Responsible for the Elongation Growth Pattern  

UK PubMed Central (United Kingdom)

The variation of indole-3-acetic acid (IAA) transport along Lupinus albus L. hypocotyls was studied using decapitated seedlings and excised sections. To confirm that the mobile species...Full Text Available

1992-09-01

8

Relationship between Indole-3-Acetic Acid Levels in Apple (Malus pumila Mill) Rootstocks Cultured in Vitro and Adventitious Root Formation in the Presence of Indole-3-Butyric Acid 1  

UK PubMed Central (United Kingdom)

In vitro rooting response and indole-3-acetic acid (IAA) levels were examined in two genetically related dwarfing apple (Malus pumila Mill) rootstocks. M.26 and M.9...Full Text Available

1989-02-01

9

Regulation of Indole-3-Acetic Acid Biosynthetic Pathways in Carrot Cell Cultures 1  

UK PubMed Central (United Kingdom)

2,4-Dichlorophenoxyacetic acid (2,4-D) promotes the accumulation of tryptophan-derived indole-3-acetic acid (IAA) in carrot cell cultures during callus proliferation by a biosynthetic pathway that is...Full Text Available

1992-11-01

10

Metabolism of Indole-3-Acetic Acid by Pericarp Discs from Immature and Mature Tomato (Lycopersicon esculentum Mill) 1  

UK PubMed Central (United Kingdom)

[1′-14C, 13C6]Indole-3-acetic acid was infiltrated into immature pericarp discs from fruits of tomato (Lycopersicon esculentum Mill., cv Moneymaker)....Full Text Available

1992-11-01

11

Metabolism and Synthesis of Indole-3-Acetic Acid (IAA) in Zea mays (Levels of IAA during Kernel Development and the Use of in Vitro Endosperm Systems for Studying IAA Biosynthesis).  

UK PubMed Central (United Kingdom)

Kernels of Zea mays on an intact plant accumulate indole-3-acetic acid (IAA) at the rate of 190 ng g-1 fresh weight h-1. Of the IAA synthesized, 97% is in the esterified form and less than 3% remains...Full Text Available

1994-09-01

12

Ethylene-Enhanced Catabolism of [14C]Indole-3-Acetic Acid to Indole-3-Carboxylic Acid in Citrus Leaf Tissues 1  

UK PubMed Central (United Kingdom)

Exogenous [14C]indole-3-acetic acid (IAA) is conjugated in citrus (Citrus sinensis) leaf tissues to one major substance which has been identified as indole-3-acetylaspartic...Full Text Available

1990-01-01

13

Effect of Exogenous Indole-3-Acetic Acid and Indole-3-Butyric Acid on Internal Levels of the Respective Auxins and Their Conjugation with Aspartic Acid during Adventitious Root Formation in Pea Cuttings  

UK PubMed Central (United Kingdom)

The influence of exogenous indole-3-acetic acid (IAA) and indole-3-butyric acid (IBA) on the internal levels of these auxins was studied during the first 4 days of adventitious root formation in cuttings...Full Text Available

1991-07-01

14

Distribution of Indole-3-Acetic Acid and the Occurrence of Its Alkali-Labile Conjugates in the Extraxylary Region of Pinus sylvestris Stems 1  

UK PubMed Central (United Kingdom)

Free and conjugated indole-3-acetic acid (IAA) were measured by quantitative gas chromatography-selected ion monitoringmass spectrometry in the extraxylary region of the stem of large Pinus...Full Text Available

1990-08-01

15

Changes in Free and Conjugated Indole 3-Acetic Acid and Abscisic Acid in Young Cotton Fruits and Their Abscission Zones in Relation to Fruit Retention during and after Moisture Stress  

UK PubMed Central (United Kingdom)

Experiments were conducted with field-grown cotton (Gossypium hirsutum L.) in 1985 and 1986 to determine effects of water deficit on levels of conjugated indole 3-acetic...Full Text Available

1988-01-01

16

Wounding Nicotiana tabacum Leaves Causes a Decline in Endogenous Indole-3-Acetic Acid 1  

UK PubMed Central (United Kingdom)

We have previously observed that auxin can act as a repressor of the wound-inducible activation of a chimeric potato proteinase inhibitor II-CAT chimeric gene (pin2-CAT) in transgenic...Full Text Available

1991-07-01

17

Inhibitory Action of Auxin on Root Elongation Not Mediated by Ethylene  

UK PubMed Central (United Kingdom)

The inhibitory effects of indole-3-acetic acid (IAA) and 1-aminocyclopropane-1-carboxylic acid (ACC) on elongation growth of pea (Pisum sativum L.) seedling roots were investigated...Full Text Available

1989-09-01

18

Influence of Water Deficits on the Abscisic Acid and Indole-3-Acetic Acid Contents of Cotton Flower Buds and Flowers  

UK PubMed Central (United Kingdom)

A field experiment was conducted during the summer of 1988 to test the hypothesis that water deficit affects the abscisic acid (ABA) and indole acetic acid (IAA) concentrations in cotton (Gossypium...Full Text Available

1990-07-01

19

In Vivo Measurement of Indole-3-acetic Acid Decarboxylation in Aging Coleus Petiole Sections  

UK PubMed Central (United Kingdom)

The concentration of indoleacetic acid (IAA) in plant tissues is regulated, in part, by its rate of decarboxylation. However, the commonly used in vitro assays for IAA oxidase may not...Full Text Available

1983-09-01

20

Changes in Amide-Linked and Ester Indole-3-Acetic Acid in Cotton Fruiting Forms during Their Development  

UK PubMed Central (United Kingdom)

The concentration of free indoleacetic acid (IAA) is high in cotton (Gossypium hirsutum L.) fruiting forms before anthesis, but is low at and for a few days after anthesis. Amide-linked...Full Text Available

1989-03-01

 
 
 
 
21

Auxin-Induced Ethylene Production as Related to Auxin Metabolism in Leaf Discs of Tobacco and Sugar Beet 1  

UK PubMed Central (United Kingdom)

Exogenously supplied indole-3-acetic acid (IAA) stimulated ethylene production in tobacco (Nicotiana glauca) leaf discs but not in those of sugar beet (Beta vulgaris...Full Text Available

1983-11-01

22

A gene encoding a protein modified by the phytohormone indoleacetic acid  

UK PubMed Central (United Kingdom)

We show that the expression of an indole-3-acetic acid (IAA)-modified protein from bean seed, IAP1, is correlated to the developmental period of rapid growth during seed development. Moreover, this...Full Text Available

2002-02-05

23

Stable Isotope Labeling, in Vivo, of d- and l-Tryptophan Pools in Lemna gibba and the Low Incorporation of Label into Indole-3-Acetic Acid 1  

UK PubMed Central (United Kingdom)

We present evidence that the role of tryptophan and other potential intermediates in the pathways that could lead to indole derivatives needs to be reexamined. Two lines of Lemna gibba...Full Text Available

1991-04-01

24

Quantitation of Indoleacetic Acid Conjugates in Bean Seeds by Direct Tissue Hydrolysis 1  

UK PubMed Central (United Kingdom)

Gas chromatography-selected ion monitoring-mass spectral analysis using [13C6]indole-3-acetic acid (IAA) as an internal standard provides an effective means for quantitation of...Full Text Available

1989-06-01

25

Isomerization of 1-O-Indol-3-Ylacetyl-?-d-Glucose 1  

UK PubMed Central (United Kingdom)

The first compound in the series of reactions leading to the ester conjugates of indole-3-acetic acid (IAA) in kernels of Zea mays sweet corn is the acyl alkyl acetal, 1-O-indol-3-ylacetyl-β-d-glucose...Full Text Available

1990-09-01

26

Enzymic Synthesis of Indole-3-Acetyl-1-O-?-d-Glucose 1  

UK PubMed Central (United Kingdom)

The first enzyme-catalyzed reaction leading from indole-3-acetic acid (IAA) to the myo-inositol esters of IAA is the synthesis of indole-3-acetyl-1-O-β-d-glucose...Full Text Available

1988-12-01

27

Chemical modification of humic acids by the introduction of indole-containing fragments  

British Library Electronic Table of Contents (United Kingdom)

A method for the chemical modification of the initial structure of humic acids by acylation with indole-3-acetic acid chloride was developed to increase the biological activity of preparations based on peat and lignite humic acids. The plant growth stimulating effect and the antibacterial activity of the synthesized humic preparations were studied.

2011-01-01

28

Characterization of Auxin Conjugates in Arabidopsis. Low Steady-State Levels of Indole-3-Acetyl-Aspartate, Indole-3-Acetyl-Glutamate, and Indole-3-Acetyl-Glucose1  

UK PubMed Central (United Kingdom)

Amide-linked indole-3-acetic acid (IAA) conjugates constitute approximately 90% of the IAA pool in the dicot Arabidopsis, whereas ester-linked conjugates and free IAA account for approximately...Full Text Available

2000-06-01

29

Cambial-Region-Specific Expression of the Agrobacterium iaa Genes in Transgenic Aspen Visualized by a Linked uidA Reporter Gene1  

UK PubMed Central (United Kingdom)

The level of indole-3-acetic acid (IAA) was locally modified in cambial tissues of transgenic aspen (Populus tremula L. × Populus tremuloides Michx.). We also...Full Text Available

2000-06-01

30

Synthesis of 4,5,6,7 and 2,4,5,6,7 deuterium-labeled indole-3-acetic acid for use in mass spectrometric assays  

Energy Technology Data Exchange (ETDEWEB)

Syntheses are described for tetra and pentadeutero indole-3-acetic acid (IAA) labeled in positions 4,5,6,7 or 2,4,5,6,7 of the indole moiety. Polydeuterated IAA is proposed as an internal standard for gas chromatographic-mass spectrometric analysis of IAA by selected ion monitoring. Nanogram amounts of IAA may be assayed by monitoring the base peak of IAA at m/z = 130 (134 for d/sub 4/-IAA) and the molecular ion of the methyl ester of IAA at 189 (193 for d/sub 4/-IAA). Deuterium in positions 4,5,6, and 7 and, to only a slightly lesser extent, that in position 2 of IAA is retained during alkali treatment, thus permitting use of these compounds as internal standards for assay of IAA released by alkaline hydrolysis of ester and amide conjugates. The use of polydeutero internal standards separates the standards from the isotope cluster caused by the normal abundance of heavy isotopes and also permits use of reduced mass resolution, thus leading to ...

1980-10-01