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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％。
Studies on photosynthetic characteristics show that the high dry matter accumulation efficiency of intersubspecific hybrid rice is not due to the increase of single leaf photosynthetic rate but due to the increase of leaf area index. Developed photosynthetic system, the ability to use weak light, is its physiological basis for the increase of leaf area index. Subspecies hybrid rice per grain of leaves accounted for the same plot and Shanyou 63 is very close, but each leaf area occupied by the spike is 14.8% lower than Shanyou 63.