K+和Mg2+对盐胁迫下荞麦幼苗生理特性的效应
Effects of K+ and Mg2+ on Physiological Traits of Buckwheat Seedlings Under Salt Stress

以不同耐盐性荞麦幼苗（盐敏感品种川荞3号和耐盐品种川荞4号）为试验材料，在盐胁迫下添加不同浓度（5、10、15、20 mmol/L）K+和Mg2+处理，测定荞麦幼苗生理指标。结果表明，适当浓度K+和Mg2+处理可显著降低盐胁迫下荞麦叶片质膜透性和MDA质量摩尔浓度，耐盐品种（川荞4号）降低幅度较大；显著增加盐胁迫下荞麦幼苗根系活力及叶片叶绿素质量分数和SOD活性，盐敏感品种（川荞3号）增加幅度较大；K+和Mg2+处理的最适浓度分别为20 mmol/L和10 mmol/L，且Mg2+的处理效果优于K+处理。
Buckwheat seedlings with different salt tolerance were used as experimental materials. Physiological indexes of buckwheat seedlings were determined through adding different concentrations of K+ and Mg2+ under salt stress. The results showed that the appropriate concentrations of K+ and Mg2+ treatment could significantly decrease the plasmalemma permeability of leaves and MDA molality of buckwheat under salt stress,the salt-tolerant buckwheat variety decreased more,and that could significantly increase the roots vigor of buckwheat seedlings and leaves chlorophyll mass fraction and SOD activity under salt stress,and the salt-sensitive buckwheat variety increased more. The optimal concentrations of K+ and Mg2+ treatment were 20 mmol/L and 10 mmol/L respectively,the effect of Mg2+ treatment was better than that of K+.