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    The Arabidopsis Vacuolar Sorting Receptor1 Is Required for Osmotic Stress-Induced Abscisic Acid Biosynthesis

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    Type
    Article
    Authors
    Wang, Zhenyu
    Gehring, Christoph A cc
    Zhu, Jianhua
    Li, Feng-Min
    Zhu, Jian-Kang cc
    Xiong, Liming cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Bioscience Program
    Molecular Signalling Group
    Plant Science
    Plant Stress Genomics Research Lab
    Date
    2014-11-21
    Online Publication Date
    2014-11-21
    Print Publication Date
    2015-01
    Permanent link to this record
    http://hdl.handle.net/10754/556897
    
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    Abstract
    Osmotic stress activates the biosynthesis of the phytohormone abscisic acid (ABA) through a pathway that is rate limited by the carotenoid cleavage enzyme 9-cis-epoxycarotenoid dioxygenase (NCED). To understand the signal transduction mechanism underlying the activation of ABA biosynthesis, we performed a forward genetic screen to isolate mutants defective in osmotic stress regulation of the NCED3 gene. Here, we identified the Arabidopsis (Arabidopsis thaliana) Vacuolar Sorting Receptor1 (VSR1) as a unique regulator of ABA biosynthesis. The vsr1 mutant not only shows increased sensitivity to osmotic stress, but also is defective in the feedback regulation of ABA biosynthesis by ABA. Further analysis revealed that vacuolar trafficking mediated by VSR1 is required for osmotic stress-responsive ABA biosynthesis and osmotic stress tolerance. Moreover, under osmotic stress conditions, the membrane potential, calcium flux, and vacuolar pH changes in the vsr1 mutant differ from those in the wild type. Given that manipulation of the intracellular pH is sufficient to modulate the expression of ABA biosynthesis genes, including NCED3, and ABA accumulation, we propose that intracellular pH changes caused by osmotic stress may play a signaling role in regulating ABA biosynthesis and that this regulation is dependent on functional VSR1.
    Citation
    The Arabidopsis Vacuolar Sorting Receptor1 Is Required for Osmotic Stress-Induced Abscisic Acid Biosynthesis 2015, 167 (1):137 Plant Physiology
    Publisher
    American Society of Plant Biologists (ASPB)
    Journal
    Plant Physiology
    DOI
    10.1104/pp.114.249268
    PubMed ID
    25416474
    PubMed Central ID
    PMC4281004
    Additional Links
    http://www.plantphysiol.org/lookup/doi/10.1104/pp.114.249268
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    Is Supplemented By:
    • [Bioproject]
      Title: Expression data of WT (NCED3pro:LUC transgenic plants, gl1 Columbia background) and ced2 under osmotic stressPublication Date: 2015-02-20. bioproject: PRJNA189940 Handle: 10754/666423
    ae974a485f413a2113503eed53cd6c53
    10.1104/pp.114.249268
    Scopus Count
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    Articles; Biological and Environmental Science and Engineering (BESE) Division; Bioscience Program

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