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自花授粉作物中.半姊妹系和姊妹系常产生于各种近亲杂交体系。而这些家系通常由于相对于其它选择单元(如s_l家系)的期望增益不大.还没有用作选择单元。利用自交半姊妹系(SHS)或全姊妹系(SFS)以及它们与S_l家系之间表型变异的差异.能降低选择方法间所期望增益的差异。本研究的目的:一是根据加性和纯合显性效应的遗传模式预测每个家系单元上选择期望增益的大小,二是对随机杂交的小麦和大豆群体衍生的SHS、SFS和S_l家系中的表型变异作出一般评价.并用此比较期望的增益值。由于误差较小.SFS小麦家系的产量表型变异(σ_(SPS)~2)的估计值较S_l家系的变异(σ_s~z_l)估计值小,小麦S_l家系与SFS或SHS家系选择期望值相对效率是1.14(σ_(SFS)/σ_(S_l))。结论是.SHS或SFS家系中的选择对生产力性状具有最大的卑益。这种选择需要较多的种籽方可满足测定.也可把选择单元的小区规模增大.增加重复次数,从而改进平均估计的精度,降低表型变异。
Self-pollinating crops, half a sister and sister siblings often occur in a variety of inbreeding. These families are usually not as large as the desired gain relative to other selection units (eg, s_l family) and have not been used as selection units yet. Using differences in SHS or SFS and phenotypic variation between them and the S-1 pedigree can reduce the difference in expected gain between selection methods. The purpose of this study is to predict the size of the desired gain of each family unit based on the hereditary model of additive and homozygous dominant effects and to estimate the expected gain of SHS, SFS and S-1 in wheat and soybean populations derived from random crosses Of the phenotypic variation to make a general assessment, and use this to compare the expected gain value. Due to the small error, the estimation of yield phenotypic variation (σ SPSS ~ 2) in SFS wheat lines was smaller than that of S 1 lines (σ_s ~ z_l), and the relative efficiency of expected selection of S_l family and SFS or SHS pedigrees Is 1.14 (σ_ (SFS) / σ_ (S_l)). The conclusion is that the choices in the SHS or SFS families have the greatest benefit to productivity traits. This selection requires more seed to satisfy the assay, but also increases the cell size of the selected cells, increases the number of repeats, improves the accuracy of the average estimation and reduces the phenotypic variation.