Developmental morphology of high yielding maize

利用植物学家理论，对玉米杂交种的丰产性进行了分析，并与亲本进行了比较。玉米杂交种的高产是由于分化小花数的增加和保持较高的成熟率，从而导致每穗成熟粒数增加，并与在小花分化期发育和活性较高的第三植物人群叶面积增大有关。但选育植物群组成变异较大的亲本是必要的。

High yielding ability of maize hybrids were analyzed and compared with their parental lines by means of developmental morphological method using phytomer theory.High yield in maize hybrids was resulted from increase of number of differentiated florets and keeping high ripening percentage which caused increasing number of ripened grains per ear and were correlated with leaf area enlargement in the third phytomer group that developed and had high activities during floret differentiation stage.Diallel analysis of phytomer(group) composition showed that genetical control of morphological characteristics may be relatively easy. But it is necessary to breed parental lines which have wide variation in phytomer(group) composition.