水杨酸对沙打旺幼苗耐盐性的影响

Effects of Salicylic Acid on Salt Tolerance of Astragalus adsurgens Pall. Seedlings

以沙打旺(Astragalus adsurgens Pall.)幼苗为材料,采用200 mmol/L Na Cl并添加不同浓度水杨酸(SA,0.2、0.4、0.6、0.8、1.0 mmol/L)的处理方法 ,通过测定沙打旺幼苗耐盐生理指标,确定外源SA对沙打旺幼苗耐盐生理特性的影响。结果表明,一定浓度的SA能明显提高盐胁迫下沙打旺幼苗叶片脯氨酸和可溶性糖含量;增强盐胁迫下沙打旺幼苗叶片过氧化物酶(POD)和过氧化氢酶(CAT)活性,降低叶片丙二醛(MDA)含量;提高盐胁迫下沙打旺幼苗的根系活力。0.6 mmol/L SA处理效果最为明显。说明外源SA能够调节沙打旺幼苗有机渗透调节物质含量和抗氧化酶系活性以及根系活力,缓解盐胁迫对沙打旺幼苗的伤害。

For studying the effects of exogenous salicylic acid on the physiological parameters of salt tolerance in Astragalus adsurgens Pall. Seedlings, the Astragalus adsurgens Pall. Seedlings were treated with 200 mmol / L Na Cl and salicylic acid of different dose（0.2、0.4、0.6、0.8、1.0 mmol / L）. The results showed that the exogenous SA could increase the content of proline and soluble sugar in Astragalus adsurgens Pall. leaves under salt stress and increase the activities of peroxidase（POD） and catalase（CAT） in leaves. Simultaneously, exogenous SA could reduce malondialdehyde（MDA） content in leaves and increase root vigor of Astragalus adsurgens Pall. seedlings. The optimal level of exogenous SA was 0.6 mmol/L. It indicated that exogenous SA could regulate organic compatible solutes and protect the anti-oxidization enzymes and root vigor in Astragalus adsurgens Pall seedling, and alleviate the injury of salt stress on Astragalus adsurgens Pall. plants.