Quantitative proteomics of Sesuvium portulacastrum leaves revealed that ion transportation by V-ATPase and sugar accumulation in chloroplast played crucial roles in halophyte salt tolerance

文献类型： 外文期刊

第一作者： Yi, Xiaoping

作者： Yi, Xiaoping;Sun, Yong;Yang, Qian;Guo, Anping;Chang, Lili;Wang, Dan;Tong, Zheng;Jin, Xiang;Wang, Limin;Wang, Xuchu;Yi, Xiaoping;Guo, Anping;Chang, Lili;Wang, Xuchu;Yu, Jianlan;Jin, Wenhai

作者机构：

关键词： Halophyte;Ion transportation;Quantitative proteomics;Sesuvium portulacastrum;Sugar accumulation;Vacuolar ATPase

期刊名称：JOURNAL OF PROTEOMICS （ 影响因子：4.044； 五年影响因子：4.02 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Physiological and proteomic responses of Sesuvium portulacastrum leaves under salinity were investigated. Different from glycophytes, this halophyte had optimal growth at 200-300mM NaCl and accumulated more starch grains in chloroplasts under high salinity. Increased contents of soluble sugars, proline, and Na+ were observed upon salinity. X-ray microanalysis revealed that Na+ was mainly compartmentalized into cell vacuole. Quantitative proteomics produced 96 salt responsive proteins, and the majority was chloroplast-located proteins. Gene ontology analysis revealed that proteins involved in ion binding, proton transport, photosynthesis and ATP synthesis were overrepresented. The expressions of a Na+/H+ antiporter and several ATP synthase subunits were activated upon high salinity. ATP hydrolysis assay demonstrated that V-ATPase activity at tonoplast was dramatically increased upon NaCl whereas vacuolar H+-pyrophosphatase and plasma membrane P-ATPase activities were not increased, which indicated that sodium compartmentalization was mainly performed by enhancing V-ATPase activity rather than P-ATPase and H+-pyrophosphatase. Accumulation of soluble sugars as well as sodium compartmentalization maintained the osmotic balance between vacuole and cytoplasm, which finally established ionic homeostasis in saline cells in true halophytes. Biological significance: Physiological and proteomic analyses of S. portulacastrum leaves under different salinities were investigated. This true halophyte accumulated more soluble sugars, starch, proline and Na+ under high salinity. Differential proteomics produced 96 salt responsive proteins and the majority was involved in ion binding, proton transport, photosynthesis, and ATP synthesis. A Na+/H+ antiporter and several ATP synthase subunits were induced upon high salinity. ATP hydrolysis assay demonstrated that V-ATPase activity at tonoplast was dramatically increased whereas vacuolar H+-pyrophosphatase and plasma membrane ATPase activities were stable upon NaCl. These findings demonstrated that the increased Na+ was compartmentalized into vacuole by enhancing V-ATPase activity rather than H+-ATPase.

分类号： Q51

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