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1991 -1 996年以 4 3个综合表现良好的亲本配制的二交、四交、八交、十六交组合为材料 ,比较了组合后代农艺性状的平均数和变异性表现及选择效果 ,以探讨不同亲本数杂交对后代的遗传变异的影响。试验结果表明 :亲本数较多的杂交组合后代性状的变异性大于亲本数较少的杂交组合后代相应性状的变异性。这说明 ,增加杂交组合的亲本数有增加后代变异的趋势。遗传相对简单的性状这种趋势越明显。除二交各性状的平均数较小外 ,其它不同杂交数的各类组合的后代在主要产量性状的平均数、1 0个最高值中所占比例的表现上也都无显著差异
From 1991 to 1996, the average, variability and agronomic traits of the combined offspring were compared with 43 hybrids, four crosses, eight crosses and 16 crosses prepared from 43 well-integrated parents The effects of different parents on the genetic variation of offspring were investigated. The results showed that the variability of the progeny traits of the parents with more parents was greater than that of the progeny of the crosses with fewer parents. This shows that increasing the number of parents of the crosses has the tendency of increasing offspring variation. This trend is more pronounced with relatively simple traits of genetics. Except for the average number of the traits in the two crosses was small, the offspring of the other combinations with different numbers of crosses also showed no significant differences in the mean of the major yield traits and the proportion of the 10 highest values