Hermaphroditic freshwater clams in the genus Corbicula produce non-reductional spermatozoa with somatic DNA content

被引:48
作者
Komaru, A [1 ]
Konishi, K
Nakayama, I
Kobayashi, T
Sakai, H
Kawamura, K
机构
[1] Mie Univ, Fac Bioresources, Tsu, Mie 514, Japan
[2] Natl Res Inst Aquaculture, Fisheries Agcy, Nansei, Mie 51601, Japan
[3] Natl Fisheries Univ, Yamaguchi 75965, Japan
关键词
D O I
10.2307/1542934
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
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页码:320 / 323
页数:4
相关论文
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