evelopmental genetic analysis for head diameter of cauliflower (Brassica oleracea L. var. botrytis L.)
花椰菜花球球径的发育遗传研究

An additive-dominant genetic model with genotype-environment(GE) interaction was employed to analyze the genetic behavior of head diameter of cauliflower at different developmental stages, based on 2-year data from 6×6 diallel crosses. The results indicate that head diameter of parents and F1 was mainly controlled by additive effects at whole developmental period, and the effect of environmental deviation of different years on it was less. Compared with genetic main effects, GE interaction effects played a minor and insignificant role on the head diameter. The predicted additive effects of head diameter at different developmental stages indicated that enhanced head diameter over population mean could be expected when Ruixue 70, c-3 and c-5 were selected as parents, while opposite phenomenon was observed when Fuzhou 80 and c-8 were selected. It was found that, by conditional variances and conditional additive effects, extra new additive and dominant effects were detected at most developmental periods, which were relatively stable under different environmental conditions. But interestingly, opposite direction was observed for these extra new additive and dominant effects before and after Oct.12. Significant conditional additive variance and conditional dominant variance were detected at most stages (except final stage conditioned on Oct.24 for conditional additive variance). Eighty-eight point eight percent of unconditional additive variation was contributed by net additive effects accumulated from initial time to Oct.6.