摘要
低温和高温两种不同的逆境锻炼均能提高黄瓜幼苗在高温条件下的游离态水杨酸（ＳＡ）、可溶性蛋白质含量，提高或保持膜保护酶的活性，减轻膜脂过氧化程度，从而增强幼苗对高温的抵抗能力。高温处理使未锻炼的黄瓜幼苗表观光合量子效率（ＡＱＥ）和光合效率（ＣＥ）明显下降，净光合速率（Ｐｎ）降低。温度逆境锻炼使气孔导度（Ｇｓ）、ＡＱＥ、ＣＥ降低较少，保持较高Ｐｎ。表明高温锻炼和低温锻炼在提高黄瓜幼苗抗性方面具有相似的作用，膜保护系统、可溶性蛋白质和游离态ＳＡ对黄瓜幼苗耐高温性具有重要的意义。
The changes of some physiological characters in leaves of cucumber( Cucumis sativus L.)seedling with heat treatment after chilling and heat acclimation were measured for understanding the mechanisms of heat resistance and cross adaptation of cucumber.The contents of soluble protein and free salicylic acid(SA)increased,the activities of peroxidase(POD)and catalase(CAT)were higher in heat treated leaves with different acclimation.The Gs,AQE and CE in acclimated seedlings decreased less,and the rate of photosynthetic activity was higher than that in the seedlings of non-acclimation after heat treatment.All of these indicated that chilling acclimation and heat acclimation was si milar to each other in improving the resistance to heat injury.There was a cross adaptation to adverse circumstances.And there were important effects of membrane protective system,soluble protein and free SA on the resistance to heat stress.
出处
《园艺学报》
CAS
CSCD
北大核心
1998年第4期350-355,共6页
Acta Horticulturae Sinica
基金
国家"九五"科技攻关项目
关键词
黄瓜幼苗
温度逆境锻炼
生理特性
Cucumber seedling
Temperature stress acclimation
Heat treatment
Physiological characters
