水杨酸对黄瓜幼苗抗高温胁迫能力的影响

Effects of salicylic acid (SA) on high-temperature stress resistance of cucumber seedling

对津绿2号黄瓜四叶期的幼苗分别喷施0、50、100和200μmol·L-1的水杨酸(SA)溶液,24h后以42℃的高温胁迫24h。结果表明:不同浓度的SA溶液均可降低黄瓜叶片中的相对电导率和丙二醛(MDA)含量,增加SOD活性,以50μmol·L-1的效果最优。但相对电导率和MDA含量的降幅及SOD活性的增幅则随SA浓度的增加而减小。

Cucumber seedlings with four leaves of Jinlu No.2 were sprayed by 0,50,100,200 μmol·L-1 salicylic acid (SA).After 24 h,they were stressed by high-temperature of 42℃ for 24 h.The results showed that: SA solutions of different concentrations could reduce the relative electrical conductivity and malondialdehyde (MDA) content,and increase SOD activity.The SA concentration with the best effect was 50 μmol·L-1.But the reduced degree of the relative electrical conductivity and MDA content,and the increased degree of SOD activity were decreasing with the increasing of SA concentration.