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Comparative analysis of rDNA location in five Neotropical gomphocerine grasshopper species

机译：五个新热带蝗虫蝗物种rDNA定位的比较分析

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摘要

We report here, for the first time, the chromosome complement, number and location of the nucleolar organizer regions (NORs) revealed by silver staining (AgNO3) and fluorescent in situ hybridization (FISH) in five Neotropical gomphocerine species: Rhammatocerus brasiliensis, R. brunneri, R. palustris, R. pictus and Amblytropidia sp. The objective of this study was to summarize available data and propose a model of chromosome evolution in Neotropical gomphocerines. All five species studied showed chromosome numbers consisting of 2n = 23,X0 in males and 2n = 24,XX in females. Amblytropidia sp. was the only species showing a bivalent (M8) with megameric behavior during meiosis. The rDNA sites were restricted to autosomal pairs, i.e. the pericentromeric region of the S9 chromosome, the consensus NOR location in all five species. R. brasiliensis was the only species showing additional NORs on M4 and M6 pairs which, likewise the S9 NOR, were active in all cells analyzed. Comparison of these results with those reported previously in Palearctic gomphocerine species suggests higher resemblance of Neotropical species with the Old World species also possessing 23/24 chromosomes. Evolutionary mechanisms responsible for the observed interspecific variation in NOR location in this group are discussed.
机译：我们在这里首次报道了五个新热带地区的银染（AgNO 3 ）和荧光原位杂交（FISH）揭示的核仁组织区（NORs）的染色体互补，数目和位置gomphocerine物种：巴西Rhammatocerus，R。brunneri，R。palustris，R。pictus和Amblytropidia sp。这项研究的目的是总结现有数据，并提出新嗜性红霉素的染色体进化模型。研究的所有五个物种的染色体数均由雄性2n = 23，X0和雌性2n = 24，XX组成。弱视菌是唯一在减数分裂过程中表现出大分子行为的二价（M 8 ）物种。 rDNA位点仅限于常染色体对，即S 9 染色体的着丝粒区，这是所有五个物种的共有NOR位置。巴西雷氏菌是唯一在M 4 和M 6 对上显示其他NOR的物种，同样，S 9 NOR在所有细胞分析。将这些结果与以前在古古淋菌物种中报道的结果进行比较表明，新热带物种与旧世界物种也具有23/24染色体的相似性更高。讨论了负责观察该组NOR物种间变异的进化机制。

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