Studies on flower bud formation of Chinese kale (Brassica oleracea L. var. alboglabra L. H. Bailey)

Okuda, Nobuyuki

A Chinese kale is one of the flower vegetables using a flower bud, a flower stalk, etc., and has mainly spread widely through southern China and the countries in Southeast Asia. The breeding and raising of new vegetables are expected by the introduction of Chinese kale with heat tolerance to Japan. For that purpose, it is necessary to study the morphological, physiological and ecological characteristics of Chinese kale. It is especially important to fully understand the conditions of flower bud formation, since this is the harvest object, and the formation conditions of seed for a propagation. In this research, I attempted to clarify the morphological characteristics of the Chinese kale cultivar first. Subsequently, the earliness of an anthesis of Chinese kale was investigated over several years, and the relation between the morphological characteristics and the earliness of an anthesis was considered. Furthermore, the influence of temperature exerted on flower bud formation of Chinese kale under temperature control was investigated, and the influence of the low temperature treatment term and seedling age which are exerted on flower bud formation was investigated. Moreover, the influence of the daylength and plant growth regulator which are exerted on flower bud formation of Chinese kale was considered. The possibility of modeling which predicts the budding time and anthesis time of Chinese kale based on these results was examined. Furthermore, the influence of the age of the floret and the pollen parent exerted on seed formation of Chinese kale was investigated, and the conditions of a seed production were considered.

Studies on flower bud formation of Chinese kale (Brassica oleracea L. var. alboglabra L. H. Bailey)

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