水杨酸对番茄幼苗抗冷性的影响

Effects of Salicylic Acid on Cold Tolerance of Tomato Seedlings

在番茄三叶一心期,叶片喷施浓度为0.5、2.0、4.0mmol/L水杨酸(SA)溶液后,进行低温胁迫处理,研究外源水杨酸对番茄幼苗抗冷性的影响。结果表明:不同浓度外源SA处理均能提高番茄幼苗的抗冷性,其中以2.0mmol/L SA溶液预处理效果最佳。低温胁迫4d后,2.0mmol/LSA处理的叶片电解质渗透率显著低于其他处理;MDA含量增幅最小,为73.01%;可溶性糖含量增幅最大,为87.35%;叶绿素含量降幅最小,为16.47%。说明2.0mmol/L SA预处理对缓解番茄幼苗冷害最有效。

The effects of SA on tolerance of tomato seedlings to cold stress were studied,with the tomato seedlings at three-leaf stage treated with a series of concentration of salicylic acid （SA）（0.5,2.0,and 4.0 mmol/L）.The results showed that SA could enhance the tolerance of tomato seedlings to cold stress,with the most effective for the concentration of SA at 2.0 mmol/L.Compared to non-treated tomato seedlings with cold stress,the rate of electrolyte leakage of tomato seedlings could be detected in the leaves of tomato seedlings treated with the concentration of SA at 2.0 mmol/L for 4 days after cold stress,which was significantly lower than other ones.While malondialdehyde（MDA） had a least increase of 73.01％.The content of soluble sugar had a highest increase of 87.35 ％.Chlorophyll content had a decrease of 16.47 ％.Therefore,the results suggested that tolerance of tomato seedlings to cold stress could be increased after a pre-treatment with SA at concentration of 2.0 mmol/L.