辽宁省大豆更替品种主要农艺性状研究

本文研究了建国以来辽宁省大豆更替品种主要农艺性状的遗传改进及主要农艺性状与更替品种产量的关系。总的趋势是13个性状中除了分枝数以外其余性状均有不同程度的增长，其中三粒英数、分枝英数、单株粒重、粒茎比、株高及主茎节数的增长量较大，生育期变化量最小。相关与通径分析结果表明，单株粒重与单株荚数、主茎荚数、分枝荚数、百粒重和粒茎比有直接相关效应。单株荚数对单株产量的直接效应最大，是影响单株产量的主要因子。

STUDY ON ALTERATION OF MAIN AGRONOMIC CHARACTERS RELEASED SOYBEAN VARIETIES IN LIAONING

The relationships between main agronomic characters and seed yield per plant of soybean renewed released varieties in Liaoning since the establishment of new China was studied. The general tendency showed that among 13 characters besides No. of branches all increased in different levels. Pods of 3-seed, pods on branches, seed weight per plant, seed/stem ratio, plant height and nodes of main stem increased significantly, and days from emergency to maturity had only few increased. Genetic variations indicated that pods of 3-seed, No. of branches and seed weight per plant were more sensitive to environment. Correlation analyses showed that there exist direct correlative effects between seed weight per plant and pods per plant, pods of main stem, pods on branches, 100-seed weight and seed/stem ratio. Path analyses showed clearly that pods per plant had largest direct effects on seed weight per plant and was the main factor of effecting seed yield per plant.