Vicente Pereira Luis Lenin, Chaboli Alevi Kaio Cesar, Urbanin Castanhole Márcia Maria, Figueiredo Moreira Felipe Ferraz, Freires Barbosa Julianna, Massumi Itoyama Mary
Departamento de Biologia, Laboratório de Citogenética e Molecular de Insetos, UNESP-Universidade Estadual Paulista, São José do Rio Preto, SP, Brasil
Departamento de Biologia, Laboratório de Biologia Celular, UNESP-Universidade Estadual Paulista, São José do Rio Preto, SP, Brasil.
J Insect Sci. 2015 Mar 22;15(1). doi: 10.1093/jisesa/iev009. Print 2015.
The Heteroptera have holocentric chromosomes with kinetic activity restricted to the end of chromosomes. The first meiotic division is reductional for the autosomes and equational for the sexual. Only a few species of this suborder have been analyzed. In this study, we observed the morphologies of the testes of the Heteroptera species Belostoma anurum (Herrich-Schäffer, 1948), Belostoma micantulum (Stal, 1858), Gelastocoris angulatus (Melin, 1929), Gelastocoris flavus flavus (Guérin-Méneville, 1844), Rheumatobates crassifemur crassifemur (Esaki, 1926), Buenoa amnigenus (White, 1879), Buenoa unguis (Truxal, 1953), Martarega brasiliensis (Truxal, 1949), Martarega membranácea (White, 1879), Martarega uruguayensis (Berg, 1883), Rhagovelia tenuipes (Champion, 1898) and Rhagovelia zela (Drake, 1959). We found that the testes of these species can be round, round/spiral, or elongated/spiral. The size of the prophase I cells was found to vary, with the smallest ones being detected in B. micantulum and Rha. zela, the largest in G. f. flavus, and ones of intermediate size in R. c. crassifemur and M. brasiliensis. With respect to the chromosome complement, we verified the presence of 2n = 16: (14A+XY, B. micantulum and G. angulatus), 21: (20A+X0, R. c. crassifemur), 23: (22A+X0, Rha. zela and Rha. tenuipes), 25: (24A+X0, Bu. amnigenus and Bu. unguis; 22A+2m+X0, M. membranacea), 27: (24A+2m+X0, M. brasiliensis and M. uruguayensis), 29: (26A+X1X2Y, B. anurum), and 35: (30A+X1X2X3X4Y, G. f. flavus). We found that the features of spermatogenesis in these species are similar to those of other previously described Heteroptera species, differing only in testicular morphology, chromosome number, and sex chromosome system.
半翅目昆虫具有全着丝粒染色体，其着丝粒活性局限于染色体末端。第一次减数分裂对于常染色体是减数分裂，对于性染色体是等数分裂。该亚目仅少数物种得到过分析。在本研究中，我们观察了以下半翅目物种的睾丸形态：无尾负蝽（Herrich-Schäffer，1948）、闪光负蝽（Stal，1858）、角扁蝽（Melin，1929）、黄斑扁蝽黄斑亚种（Guérin-Méneville，1844）、粗腿水黾粗腿亚种（Esaki，1926）、沼水黾（White，1879）、爪水黾（Truxal，1953）、巴西玛塔水黾（Truxal，1949）、膜质玛塔水黾（White，1879）、乌拉圭玛塔水黾（Berg，1883）、细足长蝽（Champion，1898）和泽长蝽（Drake，1959）。我们发现这些物种的睾丸可以是圆形、圆/螺旋形或细长/螺旋形。前期I细胞的大小各不相同，最小的在闪光负蝽和泽长蝽中检测到，最大的在黄斑扁蝽黄斑亚种中，中等大小的在粗腿水黾粗腿亚种和巴西玛塔水黾中。关于染色体组，我们证实存在以下染色体数目：2n = 16：（14条常染色体+XY，闪光负蝽和角扁蝽），21：（20条常染色体+X0，粗腿水黾粗腿亚种），23：（22条常染色体+X0，泽长蝽和细足长蝽），25：（24条常染色体+X0，沼水黾和爪水黾；22条常染色体+2条微小染色体+X0，膜质玛塔水黾），27：（24条常染色体+2条微小染色体+X0，巴西玛塔水黾和乌拉圭玛塔水黾），29：（26条常染色体+X1X2Y，无尾负蝽），以及35：（30条常染色体+X1X2X3X4Y，黄斑扁蝽黄斑亚种）。我们发现这些物种精子发生的特征与其他先前描述的半翅目物种相似，仅在睾丸形态、染色体数目和性染色体系统方面存在差异。
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