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  The Significance of WRKY45 Transcription Factor in Metabolic Adjustments During Dark-induced Leaf Senescence

Barros, J. A. S., Cavalcanti, J. H. F., Pimentel, K. G., Medeiros, D., Silva, J. C. F., Condori-Apfata, J. A., et al. (2022). The Significance of WRKY45 Transcription Factor in Metabolic Adjustments During Dark-induced Leaf Senescence. Plant, Cell and Environment, (9), 2682-2695. doi:10.1111/pce.14393.

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Genre: Journal Article
Alternative Title : Plant, Cell & Environment

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 Creators:
Barros, Jessica A. S.1, Author
Cavalcanti, João Henrique F.1, Author
Pimentel, Karla G.1, Author
Medeiros, D.B.2, Author           
Silva, José C. F.1, Author
Condori-Apfata, Jorge A.1, Author
Lapidot-Cohen, Taly1, Author
Brotman, Y.3, Author           
Nunes-Nesi, Adriano1, Author
Fernie, A. R.2, Author           
Avin-Wittenberg, Tamar1, Author
Araújo, Wagner L.1, Author
Affiliations:
1external, ou_persistent22              
2Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753339              
3Genetics of Metabolic Traits, Cooperative Research Groups, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_2497694              

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Free keywords: Alternative pathways, Arabidopsis thaliana, energy depletion, mitochondria, transcription factor
 Abstract: ABSTRACTPlants are constantly exposed to environmental changes that affect their performance. Metabolic adjustments are crucial to control energy homeostasis and plant survival, particularly during stress. Under carbon starvation conditions, coordinated reprogramming is initiated to adjust metabolic processes, which culminate in premature senescence. This fact notwithstanding, the regulatory networks that modulate transcriptional control during low energy remain poorly understood. Here, we show that the WRKY45 transcription factor (TF) is highly induced during both developmental and dark-induced senescence. The overexpression of Arabidopsis WRKY45 resulted in an early senescence phenotype characterized by a reduction of maximum photochemical efficiency of photosystem II and chlorophyll levels in the later stages of darkness. The detailed metabolic characterization showed significant changes in amino acids coupled with the accumulation of organic acids in WRKY45 overexpression lines during dark-induced senescence. Furthermore, the markedly up-regulation of alternative oxidase (AOX1a, AOX1d) and electron transfer flavoprotein/ubiquinone oxidoreductase (ETFQO) genes suggested that WRKY45 is likely associated with a dysregulation of mitochondrial signalling and the activation of alternative respiration rather than amino acids catabolism regulation. Collectively our results provided molecular evidence that WRKY45 is involved in the plant metabolic reprogramming following carbon starvation and highlight the potential role of WRKY45 in the modulation of mitochondrial signalling pathways.This article is protected by copyright. All rights reserved.

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Language(s): eng - English
 Dates: 2022-07-112022-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1111/pce.14393
 Degree: -

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Title: Plant, Cell and Environment
  Other : Plant, Cell & Environment
Source Genre: Journal
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Publ. Info: Oxford, England : Blackwell Science
Pages: - Volume / Issue: (9) Sequence Number: - Start / End Page: 2682 - 2695 Identifier: ISSN: 0140-7791
CoNE: https://pure.mpg.de/cone/journals/resource/954925471334