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The transcription factor MYB29 is a regulator of alternative oxidase1a

Author:
  • Xinhua Zhang
  • Aneta Ivanova
  • Klaas Vandepoele
  • Jordan Radomiljac
  • Jan Van De Velde
  • Oliver Berkowitz
  • Patrick Willems
  • Yue Xu
  • Sophia Ng
  • Olivier Van Aken
  • Owen Duncan
  • Botao Zhang
  • Veronique Storme
  • Kai Xun Chan
  • Dries Vaneechoutte
  • Barry James Pogson
  • Frank Van Breusegem
  • James Whelan
  • Inge De Clercq
Publishing year: 2017-03-01
Language: English
Pages: 1825-1843
Publication/Series: Plant Physiology
Volume: 173
Issue: 3
Document type: Journal article
Publisher: American Society of Plant Biologists

Abstract english

Plants sense and integrate a variety of signals from the environment through different interacting signal transduction pathways that involve hormones and signaling molecules. Using ALTERNATIVE OXIDASE1a (AOX1a) gene expression as a model system of retrograde or stress signaling between mitochondria and the nucleus, MYB DOMAIN PROTEIN29 (MYB29) was identified as a negative regulator (regulator of alternative oxidase1a 7 [rao7] mutant) in a genetic screen of Arabidopsis (Arabidopsis thaliana). rao7/ myb29 mutants have increased levels of AOX1a transcript and protein compared to wild type after induction with antimycin A. A variety of genes previously associated with the mitochondrial stress response also display enhanced transcript abundance, indicating that RAO7/MYB29 negatively regulates mitochondrial stress responses in general. Meta-analysis of hormoneresponsive marker genes and identification of downstream transcription factor networks revealed that MYB29 functions in the complex interplay of ethylene, jasmonic acid, salicylic acid, and reactive oxygen species signaling by regulating the expression of various ETHYLENE RESPONSE FACTOR and WRKY transcription factors. Despite an enhanced induction of mitochondrial stress response genes, rao7/myb29 mutants displayed an increased sensitivity to combined moderate light and drought stress. These results uncover interactions between mitochondrial retrograde signaling and the regulation of glucosinolate biosynthesis, both regulated by RAO7/MYB29. This common regulator can explain why perturbation of the mitochondrial function leads to transcriptomic responses overlapping with responses to biotic stress.

Keywords

  • Biochemistry and Molecular Biology

Other

Published
  • ISSN: 0032-0889
Olivier van Aken
E-mail: olivier [dot] van_aken [at] biol [dot] lu [dot] se

Senior lecturer

Molecular Cell Biology

+46 46 222 94 13

B-A330

4

Research group

Plant Biology

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PhD students, main supervisor

Cuong Tran

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