Ultrastructure and Differentiation of Hydrodictyon Reticulatum IV. Conjugation of Gametes and the Development of Zygospores and Azygospores
Ultrastructure and Differentiation of Hydrodictyon Reticulatum IV. Conjugation of Gametes and the Development of Zygospores and Azygospores
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Hydrodictyon Reticulatum IV 的超微结构和分化。
DOI：
10.1071/bi9720279
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发表时间：
1972
期刊：
影响因子：
--
通讯作者：
J. Pickett
中科院分区：
文献类型：
--
作者：
H. Marchant;J. Pickett
In H.配子与其它类动物的区别主要在于有些配子的鞭毛之间有一个电子致密的顶帽。接合直到配子发育的共生体壁破裂时才发生;甚至在释放的配子中也经常不发生。只有在从接合明显的培养物中收集的游动体中，这些顶帽才延伸为受精小管。受精是通过一个配子上的这种小管的尖端与另一个配子的鞭毛之间的膜融合而发生的，而另一个配子显然没有受精小管。随后的横向融合产生四鞭毛合子，这些合子在鞭毛收缩和细胞壁沉积之前仅能活动很短的时间。核融合通常先于壁分泌。不能结合的配子通常会形成一堵墙，形成奇配子。
In H. reticulatum, gametes differed from other zooids principally in that some of them bore an electron·dense apical cap between their flagella. Conjugation did not take place until the walls of the coenobia, in which the gametes developed, ruptured; and often did not occur even among the liberated gametes. Only in zooids collected from cultures in which conjugation was evident were these apical caps extended as fertilization tubules. Fertilization took place by the fusion of the tip of this tubule on one gamete with the membrane between the flagella of another which apparently lacked a fertilization tubule. Subsequent lateral fusion of the united zooids produced quadriflagellate zygotes which were active for only a short time before flagellar retrac· tion and cell wall deposition. Karyogamy usually preceded wall secretion. Gametes failing to conjugate often laid down a wall to form azygotes.