Abstract
Flowering response in intergeneric hybrid Brassicoraphanus (Brassica oleracea×Raphanus sativus, 2n=36) and interspecific hybrid Hakuran (B.×napus, 2n=38) was compared to their parental species with respect to their endogenous gibberellin (GA) contents. Flowering response of both hybrids was similar to that of their seed vernalization type parental species, e.g., R. sativus and B. campestris, respectively, but sensitivity of progenies to vernalization treatment was lowered and still unstable. Endogenous GA increased in hybrids and parental species after seed vernalization, but the GA content in vernalized hybrid seedlings was not intermediate compared to levels in the vernalized parental species. Increase in the endogenous GA in the vernalized plants was independent of the flowering response to vernalization.
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