茶樹に於ける授精結実に関する研究 : 第 1 報不完全種子の出現に就いて

概要

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There are 3 loculi in the ovary of Thea sinensis L. (Yamatomidori), each of which possesses 4 ovules; two ovules exists in the upper part of the ovary and the others in the lower part. The present study is the cytological observation on the appearance of the abortive seeds. The results are as follows. 1) The embryo-sac formation was observed in about 87% and its percentage in the upper part was almost the same as that in the lower one. 2) The percentage of fertilization was about 71% in the upper part as well as in the lower one. 3) It was observed that about 60% of ovules stopped the development and more abortive seeds were formed in the lower part than in the upper one. 4) In general the abortive seeds seemed to have appeared by about 5 months after flowering (March of next year), though the seeds began to develop in accordance with the elevation of the temperature. Seven months after flowering about 63% of the seeds stopped the development in the upper part while 89% in the lower one.