玉米群体粒叶比与光合特性及产量的关系

以４个玉为单交种为材料，在适宜密度条件下，于抽丝期剪叶或剪穗改变粒叶比与光合竺探讨不同品种群体粒叶比与产量、分配指数、光合速率及茎秆内可溶性糖含量的关系。结果表明：在适宜的叶面积指数（ＬＡＩ）条件下，同一品种群体粒叶比高，则分配指数和叶片光合速率高，茎秆中可溶性糖积累少，因此，高粒叶比具有强源畅流的作用。在适宜的ＬＡＩ范围内，扩大群体总库容，提高粒叶比有利于获得高产。

Grain leaf ratio in relation to photosynthesis and grain yield in maize

Foliage and ears of four maize cultivars were cut off at silking stage under field condition to investigate the effects of different grain leaf ratios on the photosynthesis and grain yield. The results showed that high grain leaf ratio enhanced photosynthesis, solube sugar in stalk and translocation to the grain. On the basis of optimum LAI, the high grain leaf ratio was an index to evaluate the source and sink relationship for high grain yield.