Abstract:
:To gain a better understanding of salt stress responses in plants, we used a proteomic approach to investigate changes in rice (Oryza sativa) root plasma-membrane-associated proteins following treatment with 150 mmol/L NaCl. With or without a 48 h salt treatment, plasma membrane fractions from root tip cells of a salt-sensitive rice cultivar, Wuyunjing 8, were purified by PEG aqueous two-phase partitioning, and plasma-membrane-associated proteins were separated by IEF/SDS-PAGE using an optimized rehydration buffer. Comparative analysis of three independent biological replicates revealed that the expressions of 18 proteins changed by more than 1.5-fold in response to salt stress. Of these proteins, nine were up-regulated and nine were down-regulated. MS analysis indicated that most of these membrane-associated proteins are involved in important physiological processes such as membrane stabilization, ion homeostasis, and signal transduction. In addition, a new leucine-rich-repeat type receptor-like protein kinase, OsRPK1, was identified as a salt-responding protein. Immuno-blots indicated that OsRPK1 is also induced by cold, drought, and abscisic acid. Using immuno-histochemical techniques, we determined that the expression of OsRPK1 was localized in the plasma membrane of cortex cells in roots. The results suggest that different rice cultivars might have different salt stress response mechanisms.
journal_name
Proteomicsjournal_title
Proteomicsauthors
Cheng Y,Qi Y,Zhu Q,Chen X,Wang N,Zhao X,Chen H,Cui X,Xu L,Zhang Wdoi
10.1002/pmic.200800340subject
Has Abstractpub_date
2009-06-01 00:00:00pages
3100-14issue
11eissn
1615-9853issn
1615-9861journal_volume
9pub_type
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