Production of anisogametes and gamete motility dimorphism in Monostroma angicava
Production of anisogametes and gamete motility dimorphism in Monostroma angicava
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Monostroma angicava 异配子的产生和配子运动二态性
DOI：
10.1007/s004970050096
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发表时间：
1997
影响因子：
--
通讯作者：
T. Ichimura
中科院分区：
文献类型：
--
作者：
T. Togashi;T. Motomura;T. Ichimura
从异配生殖的进化角度出发，通过对异态双相生活史海洋鱼类各种有性生殖特征的分析，研究了其生殖策略。狭叶膜配子体雌雄异株，配子稍异花。配子体的配子囊体积、密度和成熟部分的面积在雌雄间没有差异。因此，认为每种性别用于配子生产的生殖生物量投资相同。异配生殖在这个物种中似乎是来自于配子发生过程中细胞分裂数量的差异，因为大多数雄性配子囊每个产生64（26）个配子，雌性产生32（25）个配子。这与雄性和雌性配子中细胞大小的测量结果相对应。此外，在Charatsunai采样的性成熟植物的性别比为1：1。因此，有人建议，在该领域的两倍多的男性配子释放的女性配子。雌雄配子均表现出趋光性。新鲜释放的雄配子的游动速度略高于雌配子。雄配子具有游泳能力。72 h和雌配子。84小时。两性间配子运动的差异似乎与细胞大小有关。游动合子是负趋光性和游泳更迅速地比配子的任何性别。
The reproductive strategy of a marine alga with a heteromorphic biphasic life cycle was studied by analyzing various sexual reproductive characters in light of the evolution of anisogamy. Gametophytes ofMonostroma angicavawere dioecious and their gametes were slightly anisogamous. Volume of gametangium, density of gametangia and area of mature gametangial parts on each gametophyte did not differ from male to female. Therefore, the reproductive biomass investment for gamete production was considered to be the same for each sex. Anisogamy in this alga appeared to be derived from the difference in the number of cell divisions during gametogenesis, because the majority of male gametangia each produced 64 (26) gametes and the female produced 32 (25) gametes. This corresponded with measurements of cell size in male and female gametes. Further, the sex ratio was 1:1 for sexually mature plants sampled at Charatsunai. Therefore, it was suggested that in the field twice as many male gametes are released as female gametes. Liberated gametes of both sexes showed positive phototaxis. The swimming velocity of freshly liberated male gametes was a little higher than that of female gametes. Male gametes had the potential to swim for ca. 72 h and female gametes for ca. 84 h. The difference in gamete motility between the two sexes seemed to be related to cell size. Planozygotes were negatively phototactic and swam more rapidly than gametes of either sex.