外源水杨酸和茉莉酸对荞麦幼苗耐盐生理特性的效应

Effects of Exogenous Salicylic Acid and Jasmonic Acid on Physiological Traits of Salt Tolerance in Buckwheat (Fagopyrum esculentum Moench) Seedlings

以盐敏感荞麦品种‘TQ-0808’幼苗为材料,采用100mmol·L-1NaCl并添加不同浓度水杨酸(SA)和茉莉酸(JA)的处理方法,测定荞麦耐盐生理指标,确定外源SA和JA对荞麦耐盐生理特性的效应。结果表明,外源SA和JA均能明显降低盐胁迫下荞麦叶片质膜透性和丙二醛(MDA)含量,外源SA降低的幅度略高于JA,外源SA最适浓度为0.6mmol·L-1;外源SA和JA均能明显增加盐胁迫下荞麦叶片超氧化物歧化酶(SOD)和抗坏血酸过氧化物酶(APX)活性及叶片净光合速率,外源JA增加的幅度明显大于SA,外源JA最适浓度为40mol·L-1。外源SA和JA明显改善盐胁迫下荞麦的生理特性,对盐胁迫具有较好的缓解作用,说明通过适当浓度的外源SA和JA处理来提高荞麦耐盐性是可行的。

Buckwheat （Fagopyrum esculentum） seedlings of salt sensitive variety ‘TQ-0808＇ were treated as materials. Through the treatment of 100 mmol.L^（-1） NaCl and adding different concentrations of salicylic acid （SA） and jasmonic acid （JA） to determine physiological indexes of salt tolerance and to make sure the effects of exogenous SA and JAon physiological traits of salt tolerance in buckwheat. The results showed that the exogenous SA and JA could significantly reduce the plasmalemma permeability and malondialdehyde （MDA） content of buckwheat leaves under salt stress, and the exogenous SA reduced slightly more than the exogenous JA did. The optimal concentration of exogenous SA was 0.6 mmol.L^（-1）. The exogenous SA and JA could significantly increase the activities of superoxide dismutase （SOD） and ascorbate peroxidase （APX） and the net photosynthetic： rate of buckwheat leaves under salt stress, and the exogenous JA increased significantly greater than the exogenous SA did. The optimal concentration of exogenous JA was 40μmol.L^（-1）. Exogenous SA and JA could significantly improve the physiological characteristics of buckwheat and had better mitigation under salt stress. It indicates that improving salt tolerance of buckwheat is feasible through the appropriate concentration treatment of exogenous SA and JA.