关键词: 甘薯, NaCl胁迫, 离子含量, 生长

Abstract: This paper investigated the contents of K⁺, Na⁺ and Cl^-  and growth status of sweet potato plant with different gene type under NaCl treatment, so as to discuss the effect of K⁺, Na⁺ and Cl^- content changes in different organs  on plant growth and provide basis for identification of salt tolerant materials and studies on salt tolerant mechanism. Taking Shangshu19 as CK, T06 and T11 mutation by EMS  as material, this experiment  analyzed the K⁺, Na⁺ and Cl^-  contents changes in sweet potato root,stem and leaves under NaCl stress and their relation with sweet potato plant growth. The results showed that with the NaCl treatment time prolonging, the dry weight and the ratio of K⁺/Na⁺ of root，stem and leaf in all materials were decreased, while the content of Na⁺、K⁺、Cl^-was gradually increased. But T06 and T11 kept the higher dry weight increasing rate and K⁺ content and K⁺、Na⁺ value, and lower Na⁺ and Cl^- content than that of the CK. There were nagatively significant and extreme significant  correlation between the content of Na⁺ and Cl^- in plant, while the correlation with K⁺ content was significant positively. So the NaCl treatment could keep  higher plant growth rate，lower Cl^- and Na⁺ contents，higher K⁺/Na⁺ value. These indicators could provide reference for salt tolerance identification.

Key words: sweet potato, NaCl stress, ion content, growth