The Flowering Repressor SVP Confers Drought Resistance in Arabidopsis by Regulating Abscisic Acid Catabolism

Zhen Wang, Fuxing Wang, Yechun Hong, Juanjuan Yao, Zhizhong Ren, Huazhong Shi, Jian Kang Zhu

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Terrestrial plants must cope with drought stress to survive. Under drought stress, plants accumulate the phytohormone abscisic acid (ABA) by increasing its biosynthesis and decreasing its catabolism. However, the regulatory pathways controlling ABA catabolism in response to drought remain largely unclear. Here, we report that the flowering repressor SHORT VEGETATIVE PHASE (SVP) is induced by drought stress and associates with the promoter regions of the ABA catabolism pathway genes CYP707A1, CYP707A3 and AtBG1, causing decreased expression of CYP707A1 and CYP707A3 but enhanced expression of AtBG1 in Arabidopsis leaves. Loss-of-function mutations in CYP707A1 and CYP707A3 or overexpression of AtBG1 could rescue the drought-hypersensitive phenotype of svp mutant plants by increasing cellular ABA levels. Collectively, our results suggest that SVP is a central regulator of ABA catabolism and that a regulatory pathway involving SVP, CYP707A1/3, and AtBG1 plays a critical role in plant response to water deficit and plant drought resistance. This study reports that the flowering repressor SVP is a central regulator of ABA catabolism by regulating the expression of the ABA catabolism pathway genes CYP707A1, CYP707A3 and AtBG1. Loss-of-function mutations in CYP707A1 and CYP707A3 or overexpression of AtBG1 can rescue the drought-hypersensitive phenotype of svp mutant plants by increasing cellular ABA levels. The results suggest that a regulatory pathway involving SVP, CYP707A1/3, and AtBG1 plays a critical role in plant response to water deficit and plant drought resistance.

Original languageEnglish
Pages (from-to)1184-1197
Number of pages14
JournalMolecular Plant
Volume11
Issue number9
DOIs
StatePublished - Sep 10 2018

Keywords

  • ABA catabolism
  • AtBG1
  • CYP707A1
  • CYP707A3
  • SVP
  • drought resistance

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