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首页> 外文期刊>Genetics and Molecular Research >Karyotypic diversity in a population of Bryconamericus aff. iheringii (Characidae)
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Karyotypic diversity in a population of Bryconamericus aff. iheringii (Characidae)

机译：Bryconamericus aff种群的核型多样性。 iheringii（夏瓜科）

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Bryconamericus comprises 56 species distributed into three groups, on the basis of the position and shape of the maxillary teeth: B. exodon, B. microcephalus and B. iheringii groups. Few cytogenetic data are available for this genus, but the diploid number of 52 chromosomes is quite common, although the karyotypic variability is extensive. This study aimed to characterize a population of B. aff. iheringii and thus contribute more cytogenetic information and better understanding of the structure and karyotypic evolution of this genus. We found 6 cytotypes with different NOR patterns: cytotype I showed a karyotype formula of 12m+10sm+16st+14a (FN = 90) and single NORs; cytotype II with 18m+14sm+10st+10a (FN = 94) and cytotype III with 20m+18sm+4st+10a (FN = 94), showing both single and multiple NORs; cytotype IV with 20m+14sm+12st+6a (NF = 98), cytotype V with 22m+18sm+8st+4a (FN = 100) and cytotype VI with 18m+24sm+6st+4a (FN = 100), all with multiple NORs. Cytotype I is the most different in relation to FN and NOR pattern, and can be regarded as belonging to another species of the genus Bryconamericus, living in sympatry in Três Bocas Stream. The remaining cytotypes may have been generated by crosses between them and by pericentric inversions. Meiotic cells were also analyzed and showed that despite the high karyotypic variability, chromosome pairing occurred normally. The great variability found in B. aff. iheringii may be related to a high degree of polymorphism; nevertheless, the possibility of occurrence of more than one species in this location is not ruled out, demonstrating the need for conservation of the Três Bocas Stream.
机译：Bryconamericus包括56种，根据上颌牙齿的位置和形状分为三类：B. exodon，B。microcephalus和B. iheringii。该属的细胞遗传学数据很少，但52号染色体的二倍体数目相当普遍，尽管核型变异性很大。这项研究旨在表征嗜血杆菌的种群。并因此贡献了更多的细胞遗传学信息，并更好地了解了该属的结构和核型演化。我们发现了6种具有不同NOR模式的细胞类型：I型细胞显示出12m + 10sm + 16st + 14a（FN = 90）的核型公式和单个NOR。具有18m + 14sm + 10st + 10a的细胞类型II（FN = 94）和具有20m + 18sm + 4st + 10a的细胞类型III（FN = 94），显示单个或多个NOR。具有20m + 14sm + 12st + 6a（NF = 98）的IV型，具有22m + 18sm + 8st + 4a（FN = 100）的V型细胞和具有18m + 24sm + 6st + 4a（FN = 100）的VI型细胞类型多个NOR。细胞型I与FN和NOR模式的区别最大，可以认为是另一类Bryconamericus物种，它们生活在TrêsBocas流的共生体中。其余的细胞类型可能是通过它们之间的杂交和周缘倒置产生的。还对减数分裂细胞进行了分析，结果表明尽管核型变异性很高，但染色体配对正常发生。 B. aff。中发现的巨大变异性。 iheringii可能与高度多态性有关;但是，不排除在此地点出现多个物种的可能性，这表明有必要保护特雷斯·博卡斯溪。

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