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首页> 外文期刊>Zoological Science >Chromosomal polymorphism in the gray shrew Crocidura attenuata (Mammalia : Insectivora)
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Chromosomal polymorphism in the gray shrew Crocidura attenuata (Mammalia : Insectivora)

机译：灰色sh（Crocidura activatea）中的染色体多态性（哺乳动物：Insectivora）

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摘要

Conventional and G-banded karyotypes of Crocidura attenuata Milne-Edwards, 1872 from Guangdong, southern China, are reported. The diploid chromosome number (2n) varied from 35 to 38among specimens, while the fundamental arm number (FN) consistently was 54. Of the autosomes, 14 pairs including four meta- or submetacentric, three subtelocentric, and seven acrocentric pairs showed no variation in all specimens,, whereas the remaining pairs showed Robertsonian polymorphism. The X and Y chromosomes were medium sized submetacentric and small acrocentric chromosomes, respectively. These karyotypes differ from that of C. attenuata from Taiwan, which has 40 chromosomes with 56 arms. Such differences are largely attributable to a non-Robertsonian rearrangement, where both 2n and FN values are different from each other. The largest metacentric pair observed in karyotypes from Guangdong may have resulted from the centromere-telomere translocation between an acrocentric and a subtelocentric pairs of karyotype homologous to that from Taiwan. Both morphometric difference and sequence divergence in mitochondrial cytochrome b gene between samples from Guangdong and Taiwan was relatively small. However, the nonRobertsonian rearrangement assumed between karyotypes of the shrews from Guangdong and Taiwan suggest that they are reproductively isolated from each other. The eastern continental and Taiwanese populations therefore may represent different species under the names, C. attenuata (sensu stricto), and C. tanakae Kuroda, 1938, respectively.
机译：据报道，来自中国南方的广东省的细小鳄鳄（Crocidura activatea Milne-Edwards，1872年）的常规和G带核型。二倍体染色体数（2n）在35至38个样本之间变化，而基本臂数（FN）始终为54。在常染色体中，14对，包括4个亚中心或亚亚中心，3个亚中心和7个顶心对没有变化。所有标本，而其余对则显示出罗伯逊多态性。 X和Y染色体分别是中等大小的亚中轴染色体和小的杂顶体染色体。这些核型不同于台湾的C.衰减虫，其具有40条染色体和56条臂。这种差异主要归因于非罗伯逊重排，其中2n和FN值互不相同。广东的核型中观察到的最大的亚中心核对可能是由与台湾的核中心型的近端和亚远心核对之间的着丝粒-端粒易位引起的。广东和台湾样本之间线粒体细胞色素b基因的形态学差异和序列差异均较小。然而，来自广东和台湾的rew的核型之间假定的非罗伯逊重排表明它们是生殖分离的。因此，东部大陆和台湾种群可能分别以1938年的C. tensa（sensu stricto）和tanakae Kuroda的名字代表不同的物种。

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