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An Arabidopsis senescence-associated protein SAG29 regulates cell viability under high salinity.
MedLine Citation:
PMID:  20963606     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The plasma membrane is an important cellular organ that perceives incoming developmental and environmental signals and integrates these signals into cellular regulatory mechanisms. It also acts as a barrier against unfavorable extracellular factors to maintain cell viability. Despite its importance for cell viability, molecular components determining cell viability and underlying mechanisms are largely unknown. Here, we show that a plasma membrane-localized MtN3 protein SAG29 regulates cell viability under high salinity in Arabidopsis. The SAG29 gene is expressed primarily in senescing plant tissues. It is induced by osmotic stresses via an abscisic acid-dependent pathway. Whereas the SAG29-overexpressing transgenic plants (35S:SAG29) exhibited an accelerated senescence and were hypersensitive to salt stress, the SAG29-deficient mutants were less sensitive to high salinity. Consistent with this, the 35S:SAG29 transgenic plants showed reduced cell viability in the roots under normal growth condition. In contrast, cell viability in the SAG29-deficient mutant roots was indistinguishable from that in the roots of control plants. Notably, the mutant roots exhibited enhanced cell viability under high salinity. Our observations indicate that the senescence-associated SAG29 protein is associated with cell viability under high salinity and other osmotic stress conditions. We propose that the SAG29 protein may serve as a molecular link that integrates environmental stress responses into senescing process.
Authors:
Pil Joon Seo; Jung-Min Park; Seok Ki Kang; Sang-Gyu Kim; Chung-Mo Park
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-21
Journal Detail:
Title:  Planta     Volume:  233     ISSN:  1432-2048     ISO Abbreviation:  Planta     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1250576     Medline TA:  Planta     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  189-200     Citation Subset:  IM    
Affiliation:
Department of Chemistry, Seoul National University, Seoul, Korea.
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