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两个小麦高世代品系中进行再选择。单株选择,随机区组设计,分系比较。采用方差分析法估计了该二群体中几个主要性状的遗传变异度和遗传进度,从而探讨了再选择的方法和效果。应用多元正态分布的近似计算,估测了多个性状综合选择时,所需的基础群体规模,为作物育种中的多性状遗传进度研究和群体规模估计提出了新的设想。 通过本文对两个小麦高世代品系的具体分析计算得出,南农82-4品系的产量三因素可在有700-1500株供选基础群体下,通过纯系选择,在保持原有单株穗数水平上,每穗粒软和千粒重获得2.5%-5%左右的相对遗传进度。南农2101品系在有2000-3000株左右的供选基础群体下,通过纯系选择,在保持该品系原有产量水平上,使赤霉病抗性、开花期和穗上发芽率获2.596-5%、2.5%-5%和7.5%-15%的相对遗传进度。
Two high-generation wheat lines were selected again. Single plant selection, randomized block design, fractional comparison. Variance analysis was used to estimate the genetic variability and genetic progress of several major traits in the two populations, and the methods and effects of reselection were discussed. The approximate calculation of multivariate normal distribution is used to estimate the basic population size needed for the comprehensive selection of multiple traits. A new idea is proposed for the research on the genetic progress of multi-traits in crop breeding and population size estimation. Through the detailed analysis of the two high-generation wheat lines, the three factors of Nannong 82-4 line can be selected by the pure lines in the range of 700-1500 for selection, Spike number per panicle soft and 1000 grain weight gain 2.5% -5% relative genetic progress. Nannong 2101 strain has about 2000-3000 lines of selection for the base group, through the selection of pure lines, to maintain the original yield level of the line, so that the scab resistance, flowering and spike on germination rate 2.596- 5%, 2.5% -5% and 7.5% -15% relative genetic progress.