期刊
BIOLOGIA PLANTARUM
卷 58, 期 1, 页码 179-184出版社
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s10535-013-0349-6
关键词
Cucumis sativus; Cucurbita moschata; NaCl; plasma membrane H+-ATPase; Na+/H+ antiport; SOS1; salinity
资金
- 973 Project [2009CB119000]
- National Natural Science Foundation of China [30871738, 31172000]
- Chinese Ministry of Education [109113]
- Natural Science Foundation of Hubei Province [2008CDB081]
Self-grafted and pumpkin rootstock-grafted cucumber plants were subjected to the following four treatments: 1) aerated nutrient solution alone (control), 2) nutrient solution with 10 mM Ca(NO3)(2)(Ca), 3) nutrient solution with 90 mM NaCl (NaCl), and 4) nutrient solution with 90 mM NaCl + 10 mM Ca(NO3)(2) (NaCl+Ca). The NaCl treatment decreased the plant dry mass and content of Ca2+ and K+ but increased the Na+ content in roots and shoots. Smaller changes were observed in pumpkin rootstock-grafted plants. Supplementary Ca(NO3)(2) ameliorated the negative effects of NaCl on plant dry mass, relative growth rate (RGR), as well as Ca2+, K+, and Na+ content especially for pumpkin rootstock-grafted plants. Supplementary Ca(NO3)(2) distinctly stimulated the plasma membrane (PM) H+-ATPase activity which supplies the energy to remove excess Na+ from the cells. The expressions of gene encoding PM H+-ATPases (PMA) and gene encoding a PM Na+/H+ antiporter (SOS1) were up-regulated when Ca(NO3)(2) was applied. The pumpkin rootstock-grafted plants had higher PM H+-ATPase activity as well as higher PMA and SOS1 expressions than the self-grafted plants under NaCl + Ca treatment. Therefore, the addition of Ca2+ in combination with pumpkin rootstock grafting is a powerful way to increase cucumber salt tolerance.
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