外源钙对盐胁迫下苦豆子(Sophora alopecuroides)种子萌发和幼苗生长的影响

Effects of Exogenous Calcium on Seed Germination and Seedling Growth of Sophora alopecuroides under Saline Alkali Stress

研究了盐胁迫和外源钙对苦豆子(Sophora alopecuroides)种子萌发和幼苗生长的影响。结果表明:低浓度的NaCl胁迫可以促进苦豆子种子的萌发和幼苗根茎的生长,浓度增加会不同程度地抑制种子萌发。0. 5 mg·L-1NaCl胁迫促进苦豆子幼苗茎和根的生长,高浓度Na Cl胁迫则具有明显的抑制效应,抑制作用对茎生长的效应大于对根生长的效应。幼苗根、茎中富集的钙、钠含量随着外源钙浓度的增加而增加,富集的钙含量随着NaCl溶液浓度的增加而减小。高浓度的CaCl2处理显著提高了萌发率,促进了幼苗根茎的生长。

The effects of salt stress,exogenous calcium and their interaction on seed germination and seedling growth of Sophora alopecuroides. were studied by adding exogenous calcium under simulated salt stress. The results showed that the seed germination of S. alopecuroides was promoted under 0.5 mg·L-1 NaCl solution,while inhibited under 1 and 1.5 mg·L-1 NaCl solution. The stem and root growth of S. alopecuroides seedlings were enhanced under 0.5 mg·L-1 NaCl stress while the inhibition effect was obvious under 1.5 mg·L-1 NaCl stress. The inhibition effect of NaCl on stem growth was greater than root growth. The calcium and sodium ion concentration in roots and stems of seedlings increased with the increase of exogenous calcium ion concentration. The calcium ion concentration in roots and stems of seedlings decreased with the increase of the concentration of NaCl solution. The germination and the growth of S. alopecuroides seedlings were significantly increased under higher concentrations of CaCl2 solution.