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    Arabidopsis decuple mutant reveals the importance of SnRK2 kinases in osmotic stress responses in vivo

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    Type
    Article
    Authors
    Fujii, Hiroaki cc
    Verslues, Paul E.
    Zhu, Jian-Kang cc
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Center for Desert Agriculture
    Date
    2011-01-10
    Online Publication Date
    2011-01-10
    Print Publication Date
    2011-01-25
    Permanent link to this record
    http://hdl.handle.net/10754/561701
    
    Metadata
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    Abstract
    Osmotic stress associated with drought or salinity is a major factor that limits plant productivity. Protein kinases in the SNF1-related protein kinase 2 (SnRK2) family are activated by osmotic stress, suggesting that the kinases are involved in osmotic stress signaling. However, due to functional redundancy, their contribution to osmotic stress responses remained unclear. In this report, we constructed an Arabidopsis line carrying mutations in all 10 members of the SnRK2 family. The decuple mutant snrk2.1/2/3/4/5/6/7/8/9/10 grew poorly under hyperosmotic stress conditions but was similar to the wild type in culture media in the absence of osmotic stress. The mutant was also defective in gene regulation and the accumulation of abscisic acid (ABA), proline, and inositol 1,4,5-trisphosphate under osmotic stress. In addition, analysis of mutants defective in the ABA-activated SnRK2s (snrk2.2/3/6) and mutants defective in the rest of the SnRK2s (snrk2.1/4/5/7/8/9/10) revealed that SnRK2s are a merging point of ABA-dependent and -independent pathways for osmotic stress responses. These results demonstrate critical functions of the SnRK2s in mediating osmotic stress signaling and tolerance.
    Citation
    Fujii, H., Verslues, P. E., & Zhu, J.-K. (2011). Arabidopsis decuple mutant reveals the importance of SnRK2 kinases in osmotic stress responses in vivo. Proceedings of the National Academy of Sciences, 108(4), 1717–1722. doi:10.1073/pnas.1018367108
    Sponsors
    We thank the Arabidopsis Biological Resource Center for providing the T-DNA insertion mutants. This work was supported by National Institutes of Health Grant R01GM059138 (to J.-K.Z.).
    Publisher
    Proceedings of the National Academy of Sciences
    Journal
    Proceedings of the National Academy of Sciences
    DOI
    10.1073/pnas.1018367108
    PubMed ID
    21220313
    PubMed Central ID
    PMC3029766
    Additional Links
    http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3029766
    ae974a485f413a2113503eed53cd6c53
    10.1073/pnas.1018367108
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Center for Desert Agriculture

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