棉種子の開花直後に於ける表皮細胞の突起樣相
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概要
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The object of this study was to investigate the appearances of protuberance from the epidermal cell of cotton ovule in the first stage of elongation in Lang's hvpothesis, i. e. elongation till 96 hours after thc flower opens (the time of the opening of flower in this study indicated when the petals began to separate at the apex in the early morning), and to discuss the fact that fuzz pattern appeared only after the lint pattern had fully determinated in his hypothesis. Two varieties were used in this study, the one was Shiso-men of Asiatic cotton (Gossypium arboreum) and the other Mopo No. 380 of Upland cotton (Gossypium hirsutum). The observations were done in the part of median longitudinal section with depth of 5〜10 microns of ovule by paraffin method. Result of this study is summarized as follows : Some elongations of the epidermal cell commenced within 30 minutes after the flower opens, and maximum number of elongation in the first stage were recognized between 30 minutes and 3 hours after the flower opens, afterwards a small number of cell continued to elongate, but all stopped to do within 96 hours. Percentage of the number of elongation in 9 hours after the flower opens to totall number of elongation in the first stage was 63% in Mopo 380 and 58% in Shiso-men, and the percentage till 24 hours was 76% in Mopo No. 380 and 81% in Shiso-men. Considering the reason that the formation of daughter cells, which were divided from the cell-division, was not observated which were divided from the cell-division, was not observated within 3 hours after the flower opens, author acertained that all, at least, this majority of elongations in the first stage were formed from the original epidermal cell in that day of flowering. Detailed result will be reported in Bulletin No. 3 of the Phsiographical Science Research Institute, Tokyo University.
- 1950-08-30