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- 저자 : Dellinger, Mike (검색결과 1 건)
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A cellulose synthase-like protein is required for osmotic stress tolerance in <i>Arabidopsis</i>
Zhu, Jianhua,Lee, Byeong-Ha,Dellinger, Mike,Cui, Xinping,Zhang, Changqing,Wu, Shang,Nothnagel, Eugene A.,Zhu, Jian-Kang Blackwell Publishing Ltd 2010 The Plant journal Vol.63 No.1
<P>Summary</P><P>Osmotic stress imposed by soil salinity and drought stress significantly affects plant growth and development, but osmotic stress sensing and tolerance mechanisms are not well understood. Forward genetic screens using a root-bending assay have previously identified <I>salt overly sensitive</I> (<I>sos</I>) mutants of Arabidopsis that fall into five loci, <I>SOS1</I> to <I>SOS5.</I> These loci are required for the regulation of ion homeostasis or cell expansion under salt stress, but do not play a major role in plant tolerance to the osmotic stress component of soil salinity or drought. Here we report an additional <I>sos</I> mutant, <I>sos6-1,</I> which defines a locus essential for osmotic stress tolerance<I>. sos6-1</I> plants are hypersensitive to salt stress and osmotic stress imposed by mannitol or polyethylene glycol in culture media or by water deficit in the soil. <I>SOS6</I> encodes a cellulose synthase-like protein, AtCSLD5. Only modest differences in cell wall chemical composition could be detected, but we found that <I>sos6-1</I> mutant plants accumulate high levels of reactive oxygen species (ROS) under osmotic stress and are hypersensitive to the oxidative stress reagent methyl viologen. The results suggest that SOS6/AtCSLD5 is not required for normal plant growth and development but has a critical role in osmotic stress tolerance and this function likely involves its regulation of ROS under stress.</P>
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