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《Acta Botanica Boreali-Occidentalia Sinica》 2006-11
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K~+,Na~+ and Cl~- Distribution and Absorption in Cucumber Seedlings under NaCl Stress

WANG Su-ping,GUO Shi-rong~*,ZHOU Guo-xian,JIA Yong-xia(College of Horticulture,Nanjing Agricultural University,Nanjing 210095,China)  
Hydroponics was adopted to study K~+,Na~+ and Cl~-contents in different parts of cucumber seedlings at different NaCl concentrations.It was shown that under NaCl stress cucumber plants decreased the K~+ content and increased the Cl~-content and the decrement and increment increased as the NaCl concentrations increased;after having been treated with NaCl for four days,the K~+ decrements sharply increased in various parts and the Na~+ and Cl~-contents showed a quick increase in the leaves;the three ions presented a compartmentalized distribution in which Na~+ mainly accumulated in the roots and stems and Cl~ mainly concentrated in the stems and K~+ decrement occurred from the roots to the leaves.At high or low NaCl concentration,cucumber plants increased the selectivity of their K~+ absorption and upward transport and the capacity of their compartmentalized ion distribution,which was conducive to avoiding the disorder of ion metabolism and alleviating the damage of NaCl stress.It follows that the compartmentalized ion distribution on the organ level is one of salt-tolerance mechanisms in cucumber plants.
【Fund】: 高等学校博士点科研基金(20050307031);; 江苏省农业三项工程项目(SX(2005)088)资助
【CateGory Index】: S642.2
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