薯蕷 Dioscorea Batatas DECNE. の花器形態に関する研究 : (第 2 報)大和黒皮種に於ける胚嚢発達, 並びに授精・結実に就いて

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It has already been established in the author's previous paper that the flower of "Yamato-Kurokawa", a common species belonging to the Dioscorea Batatas, was the diocious plant (MIZUNO 1953). The present study is a cytological investigation of the development of embryo sac and the phenomena of fertilization during the course of flowering. The fertilization and seed formation of this species were found naturally occuring to some extent in the field. Pollens seem to be formed about a day before flowering, but many abotive pollens are numbered in the anther. Develoment of embryo sac is usually interpreted as the modified Normal Type (Monosporic 8-nucleate Polygonum type), and its formation seems to finish about 2 days after flowering. In many cases, however, the embryo sac shows irregular in the development of the megagametogenesis. Self-fertilization by means of the gametic fusion, is observed about 4-5 days after flowering. Moreover, fertilizations are numbered more at the early flowering (from the late of July to the early August) than the other time. In one botrys, just then, fertilizations of basal flower seem to be better than the upper parts. Formation of the endosperm is the nuclear type, that is, the nuclei are invested with a cytoplasmic wall and extended into the center of the embryo sac. Development of the embryo is very bad and it is nothing but doing two successive divisions at 2 months after fertilization. The author has not yet found normal development in to the seeds. In the early time of flowering, at the expiration of 2 weeks after pollination, the seeds seem to complete on irregular development; while in the late time, all ovules develop in to seed only with coat.
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薯蕷 Dioscorea Batatas DECNE. の花器形態に関する研究 : (第 2 報)大和黒皮種に於ける胚嚢発達, 並びに授精・結実に就いて

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