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    ABA receptors: The START of a new paradigm in phytohormone signalling

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    Type
    Article
    Authors
    Klingler, John cc
    Batelli, Georgia
    Zhu, Jian-Kang cc
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Center for Desert Agriculture
    Date
    2010-06-03
    Online Publication Date
    2010-06-03
    Print Publication Date
    2010-07-01
    Permanent link to this record
    http://hdl.handle.net/10754/565950
    
    Metadata
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    Abstract
    The phytohormone abscisic acid (ABA) plays a central role in plant development and in plant adaptation to both biotic and abiotic stressors. In recent years, knowledge of ABA metabolism and signal transduction has advanced rapidly to provide detailed glimpses of the hormone's activities at the molecular level. Despite this progress, many gaps in understanding have remained, particularly at the early stages of ABA perception by the plant cell. The search for an ABA receptor protein has produced multiple candidates, including GCR2, GTG1, and GTG2, and CHLH. In addition to these candidates, in 2009 several research groups converged on a novel family of Arabidopsis proteins that bind ABA, and thereby interact directly with a class of protein phosphatases that are well known as critical players in ABA signal transduction. The PYR/PYL/RCAR receptor family is homologous to the Bet v 1-fold and START domain proteins. It consists of 14 members, nearly all of which appear capable of participating in an ABA receptor-signal complex that responds to the hormone by activating the transcription of ABA-responsive genes. Evidence is provided here that PYR/PYL/RCAR receptors can also drive the phosphorylation of the slow anion channel SLAC1 to provide a fast and timely response to the ABA signal. Crystallographic studies have vividly shown the mechanics of ABA binding to PYR/PYL/RCAR receptors, presenting a model that bears some resemblance to the binding of gibberellins to GID1 receptors. Since this ABA receptor family is highly conserved in crop species, its discovery is likely to usher a new wave of progress in the elucidation and manipulation of plant stress responses in agricultural settings. © 2010 The Author(s).
    Citation
    Klingler, J. P., Batelli, G., & Zhu, J.-K. (2010). ABA receptors: the START of a new paradigm in phytohormone signalling. Journal of Experimental Botany, 61(12), 3199–3210. doi:10.1093/jxb/erq151
    Publisher
    Oxford University Press (OUP)
    Journal
    Journal of Experimental Botany
    DOI
    10.1093/jxb/erq151
    PubMed ID
    20522527
    PubMed Central ID
    PMC3107536
    ae974a485f413a2113503eed53cd6c53
    10.1093/jxb/erq151
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Center for Desert Agriculture

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