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通过3轮机械混选,从UP363×WC457、UP368×Shailza和WH157×Bulk 1858 3个杂交组合的后代群体中选育出5个具有不同粒重的品系。这些品系以及Sonalika品种之间进行除反交外的各种可能的杂交。粒重最重(65g)的品系几乎与最重的杂种相当。不同相联度亲本的杂种是等于还是低于中值取决于相联度,并因此表现出负的杂种优势或者无杂种优势。含有等位基因离散亲本的杂种粒重高,且具有高的正杂种优势。因此,等位基因的离散是杂种优势的主要原因。配合力效应受亲本中等位基因分布方式的影响。相联亲本表现出正的一般配合力(gca)效应,而离散亲本则表现出负的一般配合力效应。
Five lines with different grain weights were selected from the progeny population of three crosses of UP363 × WC457, UP368 × Shailza and WH157 × Bulk 1858 by three rounds of mechanical mixing. These crosses, as well as the Sonalika breeds, carry out all possible crossbreeding crosses. The heaviest grain weight (65 g) was comparable to the heaviest hybrids. Whether hybrids of different associations are equal to or below the median depends on the degree of association and therefore shows a negative heterosis or no heterosis. Hybrid grains containing discrete alleles are heavy and have high positive heterosis. Therefore, the allele is the main reason for heterosis. The effect of combining ability is affected by the distribution of alleles in the parents. Associated parents showed a positive gca effect, whereas discrete parents showed negative gc effect.