薯蕷 Dioscorea Batatas DECNE. の花器形態に関する研究 : (第 3 報)大和黒皮種に於ける気温と授精に就いて : (第 4 報)長薯に於ける花器の構造に就いて

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III. On the Relation between Temperature and Fertilization in Yamato-Kurokawa. It has already been established in the author's previous report that the fertilizations of Yamato-Kurokawa were more effective at the early flowering from the end of July to the beginning of August than at any other time, and that in one botry better fertilizations were made at the basal flowers than at the upper ones (MIZUNO, 1954). In the present paper, the further investigation was added to ascertain the relation between temperature and fertilization. The results were as follows : It was observed that the non-fertilized seeds incline to appear in the case of the low temperature while the fertilized seeds increase gradually in number according as the temperature rises. As to the appearance of non-fertilized seed in the low temperature, some causes were considered by the author based on his observation. First, the embryo sac did not perfectly develope in the time of flower opening. Secondly, the anthers had sterile pollens without contents in them. The pollen wall tended to show an irregular curvature. IV. On the flower organ of Naga-Imo. In the previous report, it has already been established that the flower organs of Yamato-Kurokawa, Ise-Imo and Icho-Imo are bisexual. The present paper deals with the variability of the flower organ of Naga-Imo, a common species belonging to the Dioscorea Batatas DECNE., obtained in two districts (Sapporo and Osaka in Japan). The results were as follows : Naga-Imo of Sapporo district was a dioecious plant having only male flower, as had been established. On the other hand, it was decided that the flowers of Naga-Imo of Osaka district were bisexual ones; each flower had one pistil possessing a style with six branched stigma as well as six stamens. The ovary was a so-called inferior one which was divided into three loculi, each loculus having two anatropous ovules. From the above observation, it may be fairly said that the form of flower organ suggests the existence of two lines in Naga-Imo.
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薯蕷 Dioscorea Batatas DECNE. の花器形態に関する研究 : (第 3 報)大和黒皮種に於ける気温と授精に就いて : (第 4 報)長薯に於ける花器の構造に就いて

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