Rodrigo Duarte Drumond

Universidade Estadual de Campinas (UNICAMP)

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Luiz Gustavo Guedes Corrêa

University of Potsdam

Paolo Di Mascio

Universidade de São Paulo

Gustavo Turqueto Duarte

Belgian Nuclear Research Centre

Cleverson C. Matiolli

Universidade Estadual de Campinas (UNICAMP)

Fernanda M. Prado

Universidade de São Paulo

Juarez Pires Tomaz

Instituto Agronômico do Paraná

Michel Vincentz

Universidade Estadual de Campinas (UNICAMP)

Christian Meyer

Institut Jean-Pierre Bourgin

Américo José Carvalho Viana

Universidade Estadual de Campinas (UNICAMP)

Luciane Gauer

Monsanto (Brazil)

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Universidade Estadual de Campinas (UNICAMP)

Centre National de la Recherche Scientifique

Max Planck Institute of Molecular Plant Physiology

Universidade de São Paulo

Universidade Cidade de São Paulo

Universidade Estadual Paulista (Unesp)

AgroParisTech

Université Paris-Saclay

Institut Jean-Pierre Bourgin

Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

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The Arabidopsis bZIP Gene AtbZIP63 Is a Sensitive Integrator of Transient Abscisic Acid and Glucose Signals

PLANT PHYSIOLOGY (2011)

Cleverson C. Matiolli Juarez Pires Tomaz Gustavo Turqueto Duarte Fernanda M. Prado Luiz‐Eduardo Del‐Bem

Abstract Glucose modulates plant metabolism, growth, and development. In Arabidopsis (Arabidopsis thaliana), Hexokinase1 (HXK1) is a glucose sensor that may trigger abscisic acid (ABA) synthesis and sensitivity to mediate glucose-induced inhibition of seedling development. Here, we show that the intensity of short-term responses to glucose can vary with ABA activity. We report that the transient (2 h/4 h) repression by 2% glucose of AtbZIP63, a gene encoding a basic-leucine zipper (bZIP) transcription factor partially involved in the Snf1-related kinase KIN10-induced responses to energy limitation, is independent of HXK1 and is not mediated by changes in ABA levels. However, high-concentration (6%) glucose-mediated repression appears to be modulated by ABA, since full repression of AtbZIP63 requires a functional ABA biosynthetic pathway. Furthermore, the combination of glucose and ABA was able to trigger a synergistic repression of AtbZIP63 and its homologue AtbZIP3, revealing a shared regulatory feature consisting of the modulation of glucose sensitivity by ABA. The synergistic regulation of AtbZIP63 was not reproduced by an AtbZIP63 promoter-5′-untranslated region::β-glucuronidase fusion, thus suggesting possible posttranscriptional control. A transcriptional inhibition assay with cordycepin provided further evidence for the regulation of mRNA decay in response to glucose plus ABA. Overall, these results indicate that AtbZIP63 is an important node of the glucose-ABA interaction network. The mechanisms by which AtbZIP63 may participate in the fine-tuning of ABA-mediated abiotic stress responses according to sugar availability (i.e., energy status) are discussed.

10.1104/pp.111.181743

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The arabidopsis bZIP gene AtbZIP63 is a sensitive integrator of transient abscisic acid and glucose 'signals POT. 1[W][OA]'

PLANT PHYSIOLOGY (2011)

Cleverson C. Matiolli Juarez Pires Tomaz Gustavo Turqueto Duarte Fernanda M. Prado Luiz‐Eduardo Del‐Bem

Transient (computer programming)

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