Neo-sex chromosome diversity in Neotropical melanopline grasshoppers (Melanoplinae, Acrididae)
Neo-sex chromosome diversity in Neotropical melanopline grasshoppers (Melanoplinae, Acrididae)
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DOI：
10.1007/s10709-010-9458-8
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发表时间：
2010-07-01
期刊：
影响因子：
1.5
通讯作者：
Marti, Dardo A.
中科院分区：
文献类型：
--
作者：
Castillo, Elio R. D.;Bidau, Claudio J.;Marti, Dardo A.
本文报道了新热带区六种黑蜂亚科新性染色体系统的研究结果，以有助于更好地了解它们的起源和这些系统的行为。我们的分析包括详细描述的结构和行为的性染色体配置在男性和女性减数分裂的物种属于属Ronderosia，Dichromatos和Atrachelacris。3种，R. forcipatus，R. malloi和A.单色，表现为典型的罗伯逊融合性neo性染色体。然而，R. bergi性对表明其起源涉及一个以上的重排。这两个种的Dichromatos提出了一个多neo-X1 X2 Y/X1 X1 X2 X2性别系统，与两个罗伯逊融合参与其起源。对雌性减数分裂的观察证实了所分析的性染色体的性质。我们的研究结果还显示了不同程度的同源性分歧之间的neo-sex染色体和强调的可塑性的染色体互补的新热带区Melanoplinae建立罗伯逊融合，并产生新的性染色体系统。我们还讨论了核型的多样性在这一组染色体进化的着丝粒驱动理论。
We report the results of a study on the neo-sex chromosome systems of six Neotropical Melanoplinae species for contributing to a better understanding of their origin and behaviour of these systems. Our analyses included detailed descriptions of the structure and behaviour of the sex chromosome configurations in male and female meiosis of species belonging to the genera Ronderosia, Dichromatos and Atrachelacris. Three species, R. forcipatus, R. malloi and A. unicolor, showed typical Robertsonian fusion-derived neo sex-chromosomes. However, the male metaphase I orientation of R. bergi sex pair indicated that more than one rearrangement was involved in its origin. The two species of Dichromatos presented a multiple neo-X1X2Y/X1X1X2X2 sex system, with two Robertsonian fusions involved in their genesis. Observations of female meiosis, confirmed the nature of the sex-chromosomes analyzed. Our results also showed different degrees of homology divergence between the neo-sex chromosomes and emphasize the plasticity of the chromosome complement of the Neotropical Melanoplinae to establish Robertsonian fusions and generate novel sex-chromosome systems. We also discuss karyotypic diversity within this group in terms of the centromeric drive theory of chromosomal evolution.