ワカメの生態に関する研究-IV : 着生胞子,配偶体,芽胞体におよぼす露出の影響について

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For the purpose to test its ability to stand to desiccation, the resting zoospores, the gametophytes of various growing stages, and the young sporophytes of Undaria pinnatifida were respectively exposed to the air of various humidity (45, 60.7, 84 and 100%) for various duration (15, 30, 60, 150 and 180min.) at different air temperature. After the necessary treatment they were immersed again into the normal sea water and then cultured for two or four days when their vitality or survival rate, growth rate and condition of health were examined and estimated under microscopical observations. The results obtained were summarized as follows: (1) When they were well dried in the air the resting zoospores, all cells of the gametophytes and the young sporophytes were shrivelled and died with the appearance like ‘plasmolysis’ in 5 ?? 6 minutes without regard to temperature or humidity of the atmosphere. (2) The resting zoospores were more sensitive to desiccation than gametophytes and the young sporophytes (Table 1, 2). In the case of gametophytes, those which were growing actively were more sensitive than those in resting stage (Table 3-A, B). (3) The resting zoospores, the gametophytes and the sporophytes could alive in the air of 100% humidity for long time, but in the air of lower humidity than 70.4% the resting zoospores were fatally affected in about 30 minutes and the gametophytes and the young sporophytes were affected in respectively 1 and 3 hours (Table 1 ?? 4). However the time which needs for desiccation of the materials varied with the temperature, that is to say, the temperature were higher, the time were shorter. Besides, the time varied whether they were cultured purely or not, i.e. it took much times when the glass slides were contaminated with other organisms such as diatoms etc.

ワカメの生態に関する研究-IV : 着生胞子,配偶体,芽胞体におよぼす露出の影響について

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