オキワナモズクの養殖に関する研究-5-配偶子の接合と接合子の発生

概要

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The circumstantial conditions for discharge of the gametes, their subsequent attachment and for the development of zygote were examined in the laboratory. 1) The gametes which were discharged under conditions of 15-30°C of water temperature and 8-16 hours of light-period per day, were observed to show high rates of parthenogenetic germination in some circumstances. 2) The settled number of fused and unfused gametes was found abundant in waters of 20-25°C temperature and long-day light periods. 3) The zygotes were abundantly found in 20°C of water temperature under shortday light periods, especially within the first hour of the beginning of the day light-period. 4) In Chordariaceae to which the present species belongs the process of conjugation of the gametes has not been so far observed sufficiently, while it was observed in detail in the present experiment. 5) The development of zygote showed the discoid type. After about one month of attachment, the germlings grew into new erect sporophytes under adequate culture conditions. 6) The gametes which were germinated parthenogenetically developed into the discoid type, as in the development of zoospore from their unilocular sporangium, and formed plurilocular gametangia after 15-20 days of attachment.
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