摘要： 本实验研究了1%的CaCl₂浸种对高温胁迫下小麦叶绿体结构及光合作用的生理生化特性的影响.结果表明,Ca²⁺处理可以减轻连续高温胁迫下叶片光合速率的下降幅度,降低了叶绿体类囊体膜的高温损伤.进一步的电泳分析说明,与对照比较,Ca²⁺处理增加了色素、PSⅡ（光系统Ⅱ）反应中心、捕光色素复合物及P700-Chl a（叶绿素a）复合物的含量,加强了Rubisco（二磷酸核酮糖羧化加氧酶）的合成,提高了光合速率.

关键词: 小麦, Ca²⁺, 光合速率, 类囊体膜

Abstract: The effects of secd-soaking with 1% CaCl₂ on the structure of chloro-plast of wheat and the physiological and biochemical characteristics in photosynthesis under heat stress were investigated. The results suggested that Ca²⁺ treatment might well mitigate the damage of thylakoid membrane and hence assuage the decrease of rate of leaf photosynthesis caused by continuous high temperature. The further analyses with elcctrophoresis demonstrated that Ca²⁺ treatment increased the contents of pigments, PSⅡ reaction center, light-receiving pigment complex and P700-Chl a complex, enhanced the synthesis of Rubisco and, as a result, raised the rate of photosynthesis.

Key words: Wheat (T. aestivum), Calcium, Rate of photosynthesis, Thylakoid membrane