Simultaneous production of triploid and haploid eggs by triploid Squalius alburnoides (Teleostei : Cyprinidae)
Simultaneous production of triploid and haploid eggs by triploid Squalius alburnoides (Teleostei : Cyprinidae)
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DOI：
10.1002/jez.a.51
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发表时间：
2004-07-01
影响因子：
2.8
通讯作者：
Coelho, MM
中科院分区：
文献类型：
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作者：
Alves, MJ;Gromicho, M;Coelho, MM
杂交鲑包括二倍体和多倍体形式，具有改变的繁殖模式。在本文中，我们报道了一个杂交，其中一个三倍体雌性同时产生大的三倍体和小的单倍体卵子，这些卵子与S。pyrenaicus精子虽然大的鸡蛋是罕见的（15%），他们起源的后代具有较高的存活率，使四倍体是占主导地位的幸存的兄弟姐妹。这种杂交显然产生了全部雌性后代。遗传模式推断使用4个微卫星标记和NORs（核仁组织者区）表型，并建议，单倍体鸡蛋可能是由一个非典型的杂交，其中消除不匹配的基因组允许随机分离和重组之间的同源特异性基因组，而三倍体鸡蛋克隆。这些结果表明，三倍体未减数卵的出现可能是该复合体自然四倍化的一条新途径。(C)2004 Wiley-Liss，Inc.
The hybrid minnow Squalius alburnoides comprises diploid and polyploid forms with altered modes of reproduction. In the present paper, we report a cross where a triploid female generated both large, triploid and small, haploid eggs simultaneously, which were fertilized with S. pyrenaicus sperm. Although the large eggs were rarer (15%), they originated offspring with higher survivorship, so that tetraploids were dominant among the surviving siblings. The cross yielded apparently all female progeny. Inheritance patterns were inferred using four microsatellite markers and NORs (Nucleolus Organizer Regions) phenotypes, and suggested that haploid eggs were probably produced by an atypical hybridogenesis, in which the elimination of the unmatched genome permitted random segregation and recombination between the homospecific genomes, while the triploid eggs were clonal. The present results suggest that the occurrence of triploid unreduced eggs may be a new route for the natural tetraploidization in the complex. (C) 2004 Wiley-Liss, Inc.