K~+和Mg~(2+)对盐胁迫下荞麦幼苗生理特性的效应

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、20mmol/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20mmol/L和10mmol/L,且Mg2+的处理效果优于K+处理。

Effects of K+ and Mg2+ on Physiological Traits of Buckwheat Seedlings Under Salt Stress

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⁺.