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    NKS1, Na+- and K+-sensitive 1, regulates ion homeostasis in an SOS-independent pathway in Arabidopsis

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    Type
    Article
    Authors
    Choi, Wonkyun
    Baek, Dongwon
    Oh, Dongha
    Park, Jiyoung
    Hong, Hyewon
    Kim, Woeyeon
    Bohnert, Hans Jürgen
    Bressan, Ray Anthony
    Park, Hyeongcheol
    Yun, Daejin
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2011-04
    Permanent link to this record
    http://hdl.handle.net/10754/561741
    
    Metadata
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    Abstract
    An Arabidopsis thaliana mutant, nks1-1, exhibiting enhanced sensitivity to NaCl was identified in a screen of a T-DNA insertion population in the genetic background of Col-0 gl1 sos3-1. Analysis of the genome sequence in the region flanking the T-DNA left border indicated two closely linked mutations in the gene encoded at locus At4g30996. A second allele, nks1-2, was obtained from the Arabidopsis Biological Resource Center. NKS1 mRNA was detected in all parts of wild-type plants but was not detected in plants of either mutant, indicating inactivation by the mutations. Both mutations in NKS1 were associated with increased sensitivity to NaCl and KCl, but not to LiCl or mannitol. NaCl sensitivity was associated with nks1 mutations in Arabidopsis lines expressing either wild type or alleles of SOS1, SOS2 or SOS3. The NaCl-sensitive phenotype of the nks1-2 mutant was complemented by expression of a full-length NKS1 allele from the CaMV35S promoter. When grown in medium containing NaCl, nks1 mutants accumulated more Na+ than wild type and K +/Na+ homeostasis was perturbed. It is proposed NKS1, a plant-specific gene encoding a 19 kDa endomembrane-localized protein of unknown function, is part of an ion homeostasis regulation pathway that is independent of the SOS pathway. © 2011 Elsevier Ltd. All rights reserved.
    Citation
    Choi, W., Baek, D., Oh, D.-H., Park, J., Hong, H., Kim, W.-Y., … Yun, D.-J. (2011). NKS1, Na+- and K+-sensitive 1, regulates ion homeostasis in an SOS-independent pathway in Arabidopsis. Phytochemistry, 72(4-5), 330–336. doi:10.1016/j.phytochem.2010.12.005
    Sponsors
    This work was supported by Grants from the World Class University Program (Grant No. R32-10148) funded by the Ministry of Education, Science and Technology and the Biogreen 21 Program (Grant No. 20070301034030) of the Rural Development Administration in Korea. W.C. is supported by a scholarship from the Brain Korea 21 program of the Ministry of Education, Science and Technology.
    Publisher
    Elsevier BV
    Journal
    Phytochemistry
    DOI
    10.1016/j.phytochem.2010.12.005
    PubMed ID
    21227472
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.phytochem.2010.12.005
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division

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