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    A bi-functional xyloglucan galactosyltransferase is an indispensable salt stress tolerance determinant in arabidop

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    Type
    Article
    Authors
    Li, Wenbo
    Guan, Qingmei
    Wang, Zhenyu
    Wang, Yingdian
    Zhu, Jianhua
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Center for Desert Agriculture
    Date
    2013-07
    Permanent link to this record
    http://hdl.handle.net/10754/562850
    
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    Show full item record
    Abstract
    Salinity is an abiotic stress that substantially limits crop production worldwide. To identify salt stress tolerance determinants, we screened for Arabidopsis mutants that are hypersensitive to salt stress and designated these mutants as short root in salt medium (rsa). One of these mutants, rsa3-1, is hypersensitive to NaCl and LiCl but not to CsCl or to general osmotic stress. Reactive oxygen species (ROS) over-accumulate in rsa3-1 plants under salt stress. Gene expression profiling with Affymetrix microarray analysis revealed that RSA3 controls expression of many genes including genes encoding proteins for ROS detoxification under salt stress. Map-based cloning showed that RSA3 encodes a xyloglucan galactosyltransferase, which is allelic to a gene previously named MUR3/KAM1. The RSA3/ MUR3/KAM1-encoded xylogluscan galactosyltransferase regulates actin microfilament organization (and thereby contributes to endomembrane distribution) and is also involved in cell wall biosynthesis. In rsa3-1, actin cannot assemble and form bundles as it does in the wild-type but instead aggregates in the cytoplasm. Furthermore, addition of phalloidin, which prevents actin depolymerization, can rescue salt hypersensitivity of rsa3-1. Together, these results suggest that RSA3/MUR3/KAM1 along with other cell wall-associated proteins plays a critical role in salt stress tolerance by maintaining the proper organization of actin microfilaments in order to minimize damage caused by excessive ROS. © 2013 The Author.
    Citation
    Li, W., Guan, Q., Wang, Z.-Y., Wang, Y., & Zhu, J. (2013). A Bi-Functional Xyloglucan Galactosyltransferase Is an Indispensable Salt Stress Tolerance Determinant in Arabidopsis. Molecular Plant, 6(4), 1344–1354. doi:10.1093/mp/sst062
    Sponsors
    This work was supported by National Science Foundation (NSF) grants IOS0919745 and MCB0950242 to J.Z. and by NSF grant DBI0922650.
    Publisher
    Elsevier BV
    Journal
    Molecular Plant
    DOI
    10.1093/mp/sst062
    PubMed ID
    23571490
    ae974a485f413a2113503eed53cd6c53
    10.1093/mp/sst062
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Center for Desert Agriculture

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