高温下杂交稻培矮64S／E32与其亲本的光合和抗逆参数的比较

超级稻培矮64S／E32(F1)及其亲本(父本‘E32’和母本‘培矮64S’)的剑叶在不同温度(28、35、40℃ 和45℃)恒温水浴中保温1 h,随着处理温度的升高,F1除了较其亲本有更稳定的光合色素Chl外,还有明显 增加的Car／Chl,相对高的热稳蛋白含量,高而且稳定的总的抗氧化能力。F1在高温下也有较亲本高的光合 能力。高温下,线性电子传递过程比光化学过程对温度更敏感,F1有比亲本更敏感的调节机制,Pn下降比 ΦPSⅡ、Fv／Fm下降快说明光合限制步骤可能主要是位于光合碳同化而不是光化学和光合电子传递过程。

Comparison of parameters of photosynthesis and resistance between super high-yielding rice Peiai 64S/E32 (F1) and its Parental Lines under high temperature

The detached flag leaves of super high-yielding Peiai 64S/E32(pei'ai 64SXE32) ,a hybrid rice culti-vars and its parental lines were soaked at a water bath in different temperature(28 ℃ ,35 ℃ ,40 ℃ and 45 ℃) for one hour. The results were as follows:Comparison with its parental lines,Peiai 64S/E32 had an increasing Car/Chi and relative higher content of heat stable shock protein, stronger and more stable antioxidant capacity and stronger capacity of photosynthesis with temperature, which are the physiological basis of high temperature resistance. Linear electron transportation was more sensitive to high temperature than the photochemical process,while the hybrid had a more sensitive regulation ability than its parental lines. Pn decreased faster than ΦPSII and Fv/Fm under high temperature,indicating that the restricting step was possibly in CO2 fixation but not in process photochemical and photosynthetic electron transportation.