2004•Xibei zhiwu xuebaoRequires access
Effects of salicylic acid on leaves of cucumber seedlings under water stress
Qingquan Huang, Xin Sun, Nianhui Zhang, Feng Hong, Yuan Shu, Dai Qilin, Liang Houguo, Du Linfang, Hong-Hui Lin
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Abstract
The effects of exogenous salicylic acid (SA) treatment on important physiological processes in leaves of cucumber seedlings under water stress were studied. After 24 hours treatment with 1 mmol/L SA, activity of POD increased dramatically. Activity of SOD didn't increase conspicuously. Activities of CAT and APX, which are H_2O_2 removing enzymes, have been restricted. Increasing of H_2O_2 content results in the increasing of MDA (production of oxidation on membrane), and caused slight oxidation stress. In the subsequently progress of treatments, H_2O_2 accumulated after the pretreatment with SA made the activity of CAT and APX increase. H_2O_2 was eliminated then. Content and gene transcrip level of Rubisco in seedlings pretreated by SA was evidently higher than control. The influence of water stress on photosynthesis declined. This progress improved the physiological functions of the seedlings pretreated by SA in compared with the seedlings of control, and increased the endurance of cucumber seedlings in drought stress.