外源水杨酸浸种对盐胁迫下小油菜幼苗根系生长和生理特性的影响

目的]研究外源水杨酸浸种对盐胁迫下小油菜幼苗根系生长和生理特征的影响。方法]以"五月慢"小油菜幼苗为研究对象,采用砂培法研究不同浓度的SA浸种对盐胁迫下的小油菜幼苗地下部干重、根长、根表面积、地下部SOD和POD活性的影响。结果]清水浸种时,随着盐胁迫浓度的增大,根长、根表面积和地下部干重逐渐减少,50 mmol/L盐胁迫处理SOD和POD的活性增加。在无胁迫条件下,随着水杨酸浸种浓度的增加,各项指标均呈现低浓度促进,高浓度抑制。当水杨酸浸种浓度为1.0 mmol/L时,增加的幅度最大,效果最佳。不同浓度的SA浸种对盐胁迫具有不同的缓解效果。结论]该研究结果可为小油菜抗盐胁迫提供科学的依据。

Effect of Exgo enous Salicylic Aic d on Root Gr owth and Physiological Characteristics of Brassica chinensis L.Seedlings under Salt Stress

Objective ] To study the effect of exogenous salicylic acid on root growth and physiological characteristics of Brassica chinensis L. seedlings under salt stress.Method ] Wuyue Man seedlings were used as research object and sand culture was used to study the effect of exog-enous salicylic acid on root dry weight, root length, root surface area and the activities of superoxide dismutase ( SOD), and peroxidase (POD) of Brassica chinne sis L.seedlings under salt stress.Result] During the water soaking of seed, with the increase in salt concentration, root dry weight, root length, and root surface area decreased.At the 50 mmol/L salt, the activities of SOD and POD firstly rose then dropped. Without salt stress, with the increase in soaking concentration, all indicators take on low concentration promotion and high concentration inhi-bition.When the SA soaking concentration is 1.0 mmol/L, the increase amplitude was the greatest and the effect was optimal.Soaking with different SA concentration under salt stress showed different alleviation effects. Conclusion] The results of this study can provide scientific ba-sis for Brassica chinensis L.seedling resisting salt stress.