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KMID : 0381120080300030197
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Genes and Genomics
2008 Volume.30 No. 3 p.197 ~ p.204
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Genetic Analysis of Seed Number per Pod in Brassica napus Using Augmented North Carolina (NC) Ⅱ
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Zhang Liwu
Liu Pingwu
Hong Dengfeng
Yang Guangsheng
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Abstract
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Seed number per pod is one of the three important components of yield in rapeseed. An experiment with the augmented NCⅡ design was conducted for investigating the heterosis, combining ability and genetic model of this trait. Results revealed that this trait was fitted with additive-dominance genetic model by using the variance analysis of (Wr +Vr ) and (Wr -Vr ). Higher general predictability ratio (0.693) supported that both additive and non-additive genes governed this trait. The moderate estimates of narrow-sense heritability (0.588) further confirmed this. The gene distribution estimates indicated the occurrence of asymmetry. At least one major group of genes controlled the inheritance of this trait. Per se performance of parents is a reflection of their ‘gca’ (general combining ability) effects in most F1s. Among the genotypes Y106 ranked as the top general combiner followed by HZ398 and HZ396. High estimates of mid-parent heterosis and potential ratio were observed in HZ398/Y106, indicating that it would be worthwhile to utilize these diverse genotypes as parents for the development of improved hybrids or segregants.
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KEYWORD
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Brassica napus, seed number per pod, combining ability, genetic components, gene distribution, augmented NC Ⅱ
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