Study on Degenesation of Ovules in the Ovary of Japanese chestnut (Castanea cremata Sieb. et Zucc.)

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1. Stigma of Japanese chestnut located on the top of the style with milk white color, and was surrounded by epidermal cells with thick and hard cell wall like cuticule.2. Pollen adhered on the stigma began to germinate at the stage of completion of style elongation.3. Pollen tube elongated more rapidly when pollinated at the begining stage of pollen germination than the other stage.4. The number of pollen tube per style was very few.5. It was concluded that the degeneration of ovules was owing to nonfertization, because the time of nucellus degeneration which began prior to the ovule degeneration agreed with the time when embryo sac developed and fertilization was accomplished.