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  • ORA59 and EIN3 interaction couples jasmonate-ethylene synergistic action to antagonistic salicylic acid regulation of PDF expression.

    Author(s) : He XiangJiang JiShanWang ChangQuanKatayoon Dehesh

    Author Affiliation : Department of Botany and Plant Sciences and Institute of Integrative Genome Biology, University of California, Riverside, CA 92506, USA.

    Author Email : kdehesh@ucr.edu

    Journal article : Journal of Integrative Plant Biology 2017 Vol.59 No.4 pp.275-287 ref.41

    Abstract : Hormonal crosstalk is central for tailoring plant responses to the nature of challenges encountered. The role of antagonism between the two major defense hormones, salicylic acidsalicylic acidSubject Category: Chemicals and Chemical Groups
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    (SA) and jasmonic acidjasmonic acidSubject Category: Chemicals and Chemical Groups
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    (JA), and modulation of this interplay by ethyleneethyleneSubject Category: Chemicals and Chemical Groups
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    (ET) in favor of JA signaling pathway in plant stress responses is well recognized, but the underlying mechanism is not fully understood. Here, we show the opposing function of two transcription factorstranscription factorsSubject Category: Chemicals and Chemical Groups
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    , ethylene insensitive3 (EIN3) and EIN3-Like1 (EIL1), in SA-mediated suppression and JA-mediated activation of PLANT DEFENSIN1.2 (PDF1.2). This functional duality is mediated via their effect on protein, not transcript levels of the PDF1.2 transcriptional activator octadecanoid-responsive Arabidopsis59 (ORA59). Specifically, JA induces ORA59 protein levels independently of EIN3/EIL1, whereas SA reduces the protein levels dependently of EIN3/EIL1. Co-infiltration assays revealed nuclear co-localization of ORA59 and EIN3, and split-luciferase together with yeast-two-hybrid assays established their physical interaction. The functional ramification of the physical interaction is EIN3-dependent degradation of ORA59 by the 26S proteasome. These findings allude to SA-responsive reduction of ORA59 levels mediated by EIN3 binding to and targeting of ORA59 for degradation, thus nominating ORA59 pool as a coordination node for the antagonistic function of ET/JA and SA.

    ISSN : 1672-9072

    URL : http://onlinelibrary.wiley.com/journa...

    Record Number : 20173323523

    Publisher : Wiley

    Location of publication : Beijing

    Country of publication : China

    Language of text : English

    Indexing terms for this abstract:

    Organism descriptor(s) : Arabidopsis thalianaarabidopsis thalianaSubject Category: Organism Names
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    Descriptor(s) : ethyleneethyleneSubject Category: Chemicals and Chemical Groups
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    , jasmonic acidjasmonic acidSubject Category: Chemicals and Chemical Groups
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    , plant growth regulatorsplant growth regulatorsSubject Category: Chemicals and Chemical Groups
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    , plant proteinsplant proteinsSubject Category: Chemicals and Chemical Groups
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    , salicylic acidsalicylic acidSubject Category: Chemicals and Chemical Groups
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    , synergismsynergismSubject Category: Miscellaneous
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    , transcription factorstranscription factorsSubject Category: Chemicals and Chemical Groups
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    Identifier(s) : plant growth substances, plant hormones, synergy

    Broader term(s) : ArabidopsisarabidopsisSubject Category: Organism Names
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    , BrassicaceaebrassicaceaeSubject Category: Organism Names
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    , BrassicalesbrassicalesSubject Category: Organism Names
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    , eudicotseudicotsSubject Category: Organism Names
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    , angiospermsangiospermsSubject Category: Organism Names
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    , SpermatophytaspermatophytaSubject Category: Organism Names
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    , plantsplantsSubject Category: Organism Names
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    , eukaryoteseukaryotesSubject Category: Organism Names
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