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ISHS Acta Horticulturae 1208: II Asian Horticultural Congress

Growth and flowering of Polyxena corymbosa (Hyacinthaceae)

Authors:   S. Fukai, Y. Katsu, T. Narumi-Kawasaki, E. Kodaira
Keywords:   forcing culture, delayed started culture, temperature
DOI:   10.17660/ActaHortic.2018.1208.49
Abstract:
Polyxena corymbosa (L.) Jessop is a Hyacinthaceae bulbous plant native to the Cape area in South Africa. P. corymbosa is a typical dwarf bulbous plant and blooms in early winter. The aims of this study are to reveal the basic flowering physiology of P. corymbosa and to establish flowering control of the species. Flower initiation of P. corymbosa occurred from late July to early August during storage and the inflorescence developed quickly until the middle of September. Bulbs of more than 2 g are suitable for commercial use. The floral initiation was depressed at 30C. Bulbs kept at 20 to 25C produced inflorescences with several flower primodia until 4 weeks of storage. Bulbs cultured at 15 and 20C showed nearly same days to sprout and flower. On the other hand, bulbs cultured at 25C delayed both sprouting and flowering considerably. Forcing culture is possible when bulbs are stored at 20C from early summer. Delayed-start culture is also possible if corms are stored at 30C in early autumn to prevent floral development during storage.

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