【摘要】 应用通径分析和逐步回归相结合的统计方法,研究了籽粒产量一般和较高的两种玉米杂种群体(它们分别由一般自交系杂交和优良自交系杂交的单交种组成)中高产基因型的基本性状。结果表明,高产基因型的特征随群体的产量水平而异。对于产量一般杂种群体,主要特征是果穗较长、较粗,粒重较高;对于产量较高杂种群体,主要特征是轴重和出籽率皆较高。由于轴重和出籽率有着极显著(α<0.01)的负相关,后者的产量改良将比前者困难得多。更多还原

【Abstract】 The elementary characters of high-yielding genotype were investigated for two corn hybrid populations constituted by single-crosses with ordinary-and higher-levels of kernel yield ((?)=125.14 and 159.33 grams per plant) respectively. The statistical procedure of path analysis combined with stepwise regression was applied. The results showed that the characteristics of high-yielding genotype varied with the yield level of populations. For the ordinary-yield population, the principal characteristics were longer ear length, bigger ear diameter and higher weight of kernel;yet for the higher-yield population, the characteristics mainly were higher both of cob weight and kernel percentage produced (kernel weight/ear weight). However, cob weight and kernel percentage had a highly negative correlation (α<0.01). This suggests that to improve the yield level of the higher-yield population will be much more difficult than that of the ordinary-yield one.更多还原