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对两个大豆高世代品系进行再选择。研究了几个主要性状的遗传变异和选择潜力 ,探讨了性状再选择的可能性。分析了两个品系中 8个性状和 3个产量性状的综合遗传变异度。在一定选择压下同时进行多性状选择的遗传进展进行估计 ,应用多元正态分布函数的近似计算 ,估计了多性状综合选择时所需基础群体的规模。为作物育种中多性状遗传进度研究及群体规模估计提出了新的设想。结果表明 ,南农 88-4 8在 60 0 -1 0 0 0株供选群体中 ,保持每荚粒数水平不变下 ,可使每株荚数和百粒重获得2 .5% -5%左右的相对遗传进度 ;苏豆 89-2在 1 2 0 0 -2 50 0左右的供选群体下 ,在保持产量的同时 ,可使成熟期、病斑率、虫蚀率获得 2 .5% -5%、2 .5% -5%、7.5%-1 5%的相对遗传进度
Re-select two high-generation soybean lines. The genetic variation and selection potential of several major traits were studied, and the possibility of trait selection was discussed. The comprehensive genetic variability of eight traits and three yield traits in two cultivars was analyzed. Estimating the genetic progress of selective traits while selecting traits for multiple traits, the approximate population of multivariate normal distribution functions was used to estimate the size of the basic population needed for comprehensive trait selection. This paper puts forward a new idea for the study of multi-trait genetic progress and population size estimation in crop breeding. The results showed that when the Nongong 88-4 8 was in the 60 0 -1 0 0 selection groups, keeping the level of pods per pod unchanged, the yield per pod and the weight per 100 kernels could be 2.5% -5 % Relative to the genetic progress; Su beans 89-2 in the 120250 0 or so selected population, while maintaining the yield, while the maturity, disease rate, worm eclipse rate of 2.5 % -5%, 2.5% -5%, 7.5% -1 5% relative genetic progress