2003 年 69 巻 4 号 p. 799-805
Culture studies were conducted on two local populations of a marine alga Bangia atropurpurea (Roth) Lyngbye from Enoshima and Fukaura, Japan. The wild plants from Enoshima and Fukaura were asexual and dioecious sexual plants, respectively. The archeospore germling has the same sexuality of the parental plant of gametophytes in the dioecious Fukaura plant. Isolated male or female gametophytes produced apogamous conchocelis from the vegetative cells of each plant. These conchocelis filaments produced conchosporangial branches, and the liberated conchospores grew to gametophytes. The sexuality of the gametophyte is the same as the sexuality of the mother plant. Archeospores from Enoshima and Fukaura plant were cultured at various temperatures of 5-30°C under a photon flux density of 80 μmol photons/m2/s and day lengths of 14 L:10 D and 10 L:14 D. After 40 days in culture, the maximum plant length of Fukaura was markedly smaller than those of Enoshima at 10-25°C. The Enoshima plant produced archeospores only and grew well at 15-25°C, but did not grow at 30°C after 16 days. However, the Fukaura plant grew at 10-30°C and grew well at 20-25°C. The plant produced zygotospores at 15-20°C within 40 days in culture. The results of these observations suggest that the plants of Enoshima and Fukaura have different types of life history, and the plant of Fukaura is a completely dioecious plant with an apogamic reproductive subcycle.
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