Hermaphroditic freshwater clams in the genus Corbicula produce non-reductional spermatozoa with somatic DNA content
Hermaphroditic freshwater clams in the genus Corbicula produce non-reductional spermatozoa with somatic DNA content
复制标题
DOI：
10.2307/1542934
复制
发表时间：
1997-12-01
影响因子：
1.6
通讯作者：
Kawamura, K
中科院分区：
文献类型：
--
作者：
Komaru, A;Konishi, K;Kawamura, K
两性淡水文蛤产生非还原精子，其精子DNA含量与日本三叶县文蛤的体细胞DNA含量基本一致。雌雄同体的C.aff.佐贺县的河豚和台湾的河豚也会产生非还原精子。另一方面，雌雄异株的桑黛的精子拥有体细胞中发现的一半的DNA。染色体数目分析表明，Mie县的Leana(体细胞3n=54，减数分裂细胞18)和佐贺县的C.aff，flumina(2n=36，18减数分裂细胞)分别为三倍体和二倍体。C.Leana，C.aff.的第一次减数分裂或第二次减数分裂，导致精子不能还原。我们假设雌核发育生殖发生在两个物种中；母体染色体也是非还原的，精子激活卵子的发育，但不会对后代做出贡献。
Hermaphroditic freshwater clams in the genus Corbicula produce non-reductional spermatozoa, The DNA content of spermatozoa was almost identical with that of somatic cells in C. leana from Mie Prefecture, Japan. Hermaphroditic C. aff. fluminea from Saga Prefecture and C. fluminea from Taiwan also produce non-reductional spermatozoa. On the other hand, spermatozoa of the dioecious C. sandai had half the DNA found in somatic cells. Analysis of chromosome numbers suggests that C. leana (3n = 54 in somatic cells and 18 in meiotic cells) from Mie Prefecture and C. aff, fluminea (2n = 36 in gills and 18 bivalents in meiotic cells) from Saga Prefecture are triploids and diploids, respectively. C. leana, C. aff. fluminea, and C. fluminea may lack either first or second meiosis, resulting in non-reductional spermatozoa. We assume that gynogenetic reproduction occurs in both species; maternal chromosomes are also non-reductional, and spermatozoa activate development of the eggs, but do not contribute to the offspring.