Inheritance Analysis of Bolting Correlated Traits Using Mixed Major Gene Plus Polygene Model in Brassica rapa

doi:10.11924/j.issn.1000-6850.2012-2534

Abstract

Abstract: The mixed major-gene plus polygene inheritance model was used to analyze the inheritance of bolting correlated traits in Brassica rapa, which will provide useful information for breeding a late bolting or bolting-resistant cultivars of Brassica rapa. Three phenotypic measurements, bolting index, flowering time, days to 5 cm elongated stalk, respectively, were used for inheritance analysis with six generations of P1(bolting resistant inbreed line) and P2 (vernalization independent type) and their F1, B1, B2 and F2. The results showed that the two traits, bolting index and days to 5 cm elongated stalk, both were controlled by two major genes with additive-dominance-epistatic effects (B-1 model) in hybrid. The flowering time was controlled by one major gene with additive-dominance effects plus poly-genes with additive-dominance-epistatic effects (D model). The heritability of the major genes in B1, B2 and F2 were 96.22%, 93.33%, 93.55% for bolting index, 70.68%, 70.68%, 70.64% for flowering time, 79.44%, 79.55%, 79.38% for days to 5 cm elongated stalk, respectively. But no polygene heritability was checked in B1, B2 and F2 segregating generations. It indicated that the bolting trait in Brassica rapa was controlled by one or tow major genes. This implied that in the genetic improvement for bolting resistant trait major gene is a main factor. It is fit for early selection and environment factor should also be mentioned.

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