The Arabidopsis transcription factor ANAC032 represses anthocyanin biosynthesis in response to high sucrose and oxidative and abiotic stresses

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Kashif Mahmood

2016-10-01

Full Text Available Production of anthocyanins is one of the adaptive responses employed by plants during stress conditions. During stress, anthocyanin biosynthesis is mainly regulated at the transcriptional level via a complex interplay between activators and repressors of anthocyanin biosynthesis genes. In this study, we investigated the role of a NAC transcription factor, ANAC032, in the regulation of anthocyanin biosynthesis during stress conditions. ANAC032 expression was found to be induced by exogenous sucrose as well as high light stress. Using biochemical, molecular and transgenic approaches, we show that ANAC032 represses anthocyanin biosynthesis in response to sucrose treatment, high light and oxidative stress. ANAC032 was found to negatively affect anthocyanin accumulation and the expression of anthocyanin biosynthesis (DFR, ANS/LDOX and positive regulatory (TT8 genes as demonstrated in overexpression line (35S:ANAC032 compared to wild-type under high light stress. The chimeric repressor line (35S:ANAC032-SRDX exhibited the opposite expression patterns for these genes. The negative impact of ANAC032 on the expression of DFR, ANS/LDOX and TT8 was found to be correlated with the altered expression of negative regulators of anthocyanin biosynthesis, AtMYBL2 and SPL9. In addition to this, ANAC032 also repressed the MeJA- and ABA-induced anthocyanin biosynthesis. As a result, transgenic lines overexpressing ANAC032 (35S:ANAC032 produced drastically reduced levels of anthocyanin pigment compared to wild-type when challenged with salinity stress. However, transgenic chimeric repressor lines (35S:ANAC032-SRDX exhibited the opposite phenotype. Our results suggest that ANAC032 functions as a negative regulator of anthocyanin biosynthesis in Arabidopsis thaliana during stress conditions.

The Arabidopsis Transcription Factor ANAC032 Represses Anthocyanin Biosynthesis in Response to High Sucrose and Oxidative and Abiotic Stresses.

Science.gov (United States)

Mahmood, Kashif; Xu, Zhenhua; El-Kereamy, Ashraf; Casaretto, José A; Rothstein, Steven J

2016-01-01

Production of anthocyanins is one of the adaptive responses employed by plants during stress conditions. During stress, anthocyanin biosynthesis is mainly regulated at the transcriptional level via a complex interplay between activators and repressors of anthocyanin biosynthesis genes. In this study, we investigated the role of a NAC transcription factor, ANAC032, in the regulation of anthocyanin biosynthesis during stress conditions. ANAC032 expression was found to be induced by exogenous sucrose as well as high light (HL) stress. Using biochemical, molecular and transgenic approaches, we show that ANAC032 represses anthocyanin biosynthesis in response to sucrose treatment, HL and oxidative stress. ANAC032 was found to negatively affect anthocyanin accumulation and the expression of anthocyanin biosynthesis ( DFR, ANS/LDOX) and positive regulatory ( TT8) genes as demonstrated in overexpression line (35S:ANAC032) compared to wild-type under HL stress. The chimeric repressor line (35S:ANAC032-SRDX) exhibited the opposite expression patterns for these genes. The negative impact of ANAC032 on the expression of DFR, ANS/LDOX and TT8 was found to be correlated with the altered expression of negative regulators of anthocyanin biosynthesis, AtMYBL2 and SPL9 . In addition to this, ANAC032 also repressed the MeJA- and ABA-induced anthocyanin biosynthesis. As a result, transgenic lines overexpressing ANAC032 (35S:ANAC032) produced drastically reduced levels of anthocyanin pigment compared to wild-type when challenged with salinity stress. However, transgenic chimeric repressor lines (35S:ANAC032-SRDX) exhibited the opposite phenotype. Our results suggest that ANAC032 functions as a negative regulator of anthocyanin biosynthesis in Arabidopsis thaliana during stress conditions.

The state of the epidemic

African Journals Online (AJOL)

jafricabrown

2008-12-05

Dec 5, 2008 ... sectors including government, health care workers and civil society (SANAC, 2006). ... HIV (Table 1), as well as 68% of the global new infections in children and adults; and 76% of .... Such contracts would leverage additional ...

Private pharmacies in an integrated approach to HIV/AIDS services ...

African Journals Online (AJOL)

The South African National AIDS Council emphasises that success in tackling HIV/AIDS depends on leadership at every level of society, as well as mobilisation and co-operation in all sectors including government, health care workers and civil society (SANAC, 2006). This may be an acknowledgement that South Africa's ...

Laboratorní měření předpjatého zdiva

OpenAIRE

Stará, Marie; Čajka, Radim; Matečková, Pavlína; Janulíková, Martina

2012-01-01

Předpínání zdiva je jednou z nejpoužívanějších a současně nejúčinějších metod sanace u staticky porušených objektů. Na stavební fakultě bylo vyrobeno laboratorní zařízení právě pro bližší zkoumání chování předpínaného zdiva. A to konkrétně pro měření deformací zděného rohu především v okolí kotevních desek, které slouží pro přenos předpínacích sil do zdiva. Měření bylo provedeno pro dvě hodnoty předpínacích sil. Předpětí bylo instalováno v obou směrech. Dále je zde okrajově poj...

Sanace rodiny - spolupráce odboru sociálně-právní ochrany dětí městského úřadu Náchod s nestátní neziskovou organizací Salinger o. s.

OpenAIRE

Kundrátová, Aneta

2016-01-01

Bachelor thesis deals with the support of the family and the collaboration of social workers from the Department of Social and Legal Protection of Children of the Municipal Authority in Náchod with the workers of nongovernmental organization Salinger. The first part is aimed to explain the basic concepts concerning the issue of support of the family (family, family at risk, the attitude of the state towards families, child at risk, social and legal protection of children, legislation relating...