K^+和Mg^(2+)对盐胁迫下荞麦幼苗生理特性的效应  

Effects of K^+ and Mg^(2+) on Physiological Traits of Buckwheat Seedlings Under Salt Stress

作　　者：杨洪兵[1] 

机构地区：[1]青岛农业大学生命科学学院,山东省高校植物生物技术重点实验室,山东青岛266109

出　　处：《西北农业学报》2015年第5期102-106,共5页Acta Agriculturae Boreali-occidentalis Sinica

基　　金：国家自然科学基金(31371552);山东省自然科学基金(ZR2010CL019)

摘　　要：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。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 Mg^2＋ under salt stress. The results Mg^2＋ treatment could significantly decrease the showed that the appropriate concentrations of K^＋ and 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 Mg^2＋ treatment were 20 mmol/L and 10 mmol/L respectively, the effect of Mg^2＋ treatment was better than that of K^＋.

关 键 词：K^+和Mg^2+ 盐胁迫 荞麦幼苗 生理特性 

分 类 号：Q945.78[生物学—植物学]