Development of testes and differentiation of germ cells in water frogs of the Rana esculenta-complex (Amphibia, Anura)
Development of testes and differentiation of germ cells in water frogs of the Rana esculenta-complex (Amphibia, Anura)
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DOI：
10.1163/156853899x00286
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发表时间：
1999-08-01
影响因子：
1.6
通讯作者：
Bartmanska, J
中科院分区：
文献类型：
--
作者：
Ogielska, M;Bartmanska, J
欧洲水蛙（Rana esculenta）是一种杂交种，其基因组由其亲本物种R. lessonae和R. ridiatura。在减数分裂之前，亲本组中的一个被丢弃，另一个被复制（杂交发生）。在亲本物种中，性别分化开始于蝌蚪阶段28-30（Gosner，1960），在阶段30-36，睾丸由增殖的I度苍白精原细胞组成。在第36-39期，出现了一类新的精原细胞I度（深色）。在第一次冬眠之前，生精小叶充满了包囊，包囊中含有精子发生的各个阶段的生殖细胞，直到伸长的精子细胞。In R. esculenta性腺发育从最早期就受到影响：性腺较小，由数量减少的精原细胞组成。苍白精原细胞I度增殖期延长至生命的第二年。生殖腺的结构以及生殖细胞本身的结构常常是异常的。
The European water frog, Rana esculenta, is a hybrid whose genome is:composed of haploid chromosome sets of its parental species R. lessonae and R. ridibunda. Prior to meiosis one of the parental sets is discarded and the other is duplicated (hybridogenesis). In the parental species sex differentiation begins at tadpole stages 28-30 (Gosner, 1960), at stages 30-36 the testes are composed of proliferating pale spermatogonia I degrees. At stages 36-39 a new class of spermatogonia I degrees (dark) appears. Before first hibernation, seminiferous lobules are filled with cysts containing germ cells at various stages of spermatogenesis up-to elongating spermatids. In R. esculenta gonad development is affected from the earliest stages: the gonads are smaller and composed of reduced number of spermatogonia I degrees. The phase of pale spermatogonia I degrees proliferation is prolonged up to the second year of life. The structure of the gonads, as well as that of germ cells themselves, are often abnormal.