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应用全姊妹轮回选择和S_1家系轮回选择两种方案对基础群体M_4进行了改良;对基础群体M_5只进行了全姊妹轮回选择的改良。结果表明:对同一群体用两种方案进行改良皆有显著效果。从遗传进展比较,全姊妹轮回选择方案所取得的产量遗传进展较大,但二方案未有显著差异,其它大部分农艺性状也以全姊妹方案的遗传进展较大。从群体变异程度变化的比较,S_1家系方案要优于全姊妹方案。不同群体采用同一种轮回选择方案,表现出变异程度大的群体,选择的遗传进展也大。多元方差分析表明,改良群体和基础群体间在产量平均数向量上皆有显著差异,全姊妹方案使群体的多元方差变小,S_1家系方案则使群体多元方差增大。通径分析结果表明,不同群体的有关性状对单株籽粒产量的影响有差别,同时其作用程度也不尽相同。
The basic sister group M_4 was improved by using both sibling reincarnation and S_1 family reincarnation. Only the improvement of all-sibling reincarnation was selected for the basic group M_5. The results show that: the same group with two programs to improve both have a significant effect. Compared with the genetic progress, the whole sire recurrent selection program made more progress in yield, but no significant difference was found in the two programs. Most of the other agronomic traits also made great progress in the inheritance of the whole sisters program. From the comparison of changes in the degree of group variation, the S_1 pedigree program outperformed the full sister program. Different groups use the same kind of reincarnation plan, showing a large degree of variation in the population, the choice of genetic progress is also large. Multivariate analysis of variance showed that there was a significant difference in the average yield vector between the improved group and the basic group, the all-sisters scheme reduced the multiple variance of the population, and the S-1 family scheme increased the multiple-group variance. The results of path analysis showed that the effects of different traits on the grain yield per plant were different, and their degrees of action were also different.