籼粳亚种组合干物质累积效率与光合特性的关系

从光合特性研究表明：亚种间杂交稻的高干物质累积效率，不是由于单叶光合速率的提高，而是因为叶面积指数增大所致．光合系统发达，利用弱光能力较强，是其叶面积指数增大的生理基础。亚种杂交稻每粒谷子所占叶而积同汕优６３十分接近，但每朵颖花占有的叶面积则比汕优６３低１４．８％。

The rela ttionship between the efficiency of dry matter accumulation and photosynthetic characters in indica-japonica hybrid rice

The physilogical reason for tile high efficiency of dry matter accumulation in indica-japonica hybrid rice from the aspect of photosynthetic characters has been studied. The results indicated that the high efficiency of dry matter accumulation in the hybrid was not due to the incresing of photosynthetic rate in the single leaf,but the rising of its leaf area index. It was the physiological base for the rising of leaf area index that the hybrid had developed photosystem and relatively high. ability of using weak light.The leaf area that per grain in the hybrid had was nearly the same as that in Shanyou 63, but the leaf area that per glume had in the hybrid was about 14.8K lower than that in Shanyou 63.