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Effects of non-uniform root zone salinity on water use, Na+ recirculation, and Na+ and H+ flux in cotton

文献类型： 外文期刊

作者： Kong, Xiangqiang 1 ; Luo, Zhen 1 ; Dong, Hezhong 1 ; Eneji, A. Egrinya 1 ; Li, Weijiang 1 ;

作者机构： 1.Shandong Acad Agr Sci, Shandong Key Lab Cotton Culture & Physiol, Cotton Res Ctr, Jinan 250100, Peoples R China

2.Univ Calabar, Fac Agr, Dept Soil Sci, Calabar, Nigeria

关键词： Cotton;Na+;H+<;SUP> antiporter;non-uniform salinity;split-root system;water use

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2012 年 63 卷 5 期

页码：

收录情况： SCI

摘要： A new split-root system was established through grafting to study cotton response to non-uniform salinity. Each root half was treated with either uniform (100/100 mM) or non-uniform NaCl concentrations (0/200 and 50/150 mM). In contrast to uniform control, non-uniform salinity treatment improved plant growth and water use, with more water absorbed from the non- and low salinity side. Non-uniform treatments decreased Na+ concentrations in leaves. The [Na+] in the '0' side roots of the 0/200 treatment was significantly higher than that in either side of the 0/0 control, but greatly decreased when the '0' side phloem was girdled, suggesting that the increased [Na+] in the '0' side roots was possibly due to transportation of foliar Na+ to roots through phloem. Plants under non-uniform salinity extruded more Na+ from the root than those under uniform salinity. Root Na+ efflux in the low salinity side was greatly enhanced by the higher salinity side. NaCl-induced Na+ efflux and H+ influx were inhibited by amiloride and sodium orthovanadate, suggesting that root Na+ extrusion was probably due to active Na+/H+ antiport across the plasma membrane. Improved plant growth under non-uniform salinity was thus attributed to increased water use, reduced leaf Na+ concentration, transport of excessive foliar Na+ to the low salinity side, and enhanced Na+ efflux from the low salinity root.

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