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New data on karyotype, spermatogenesis and ovarian trophocyte ploidy in three aquatic bug species of the families Naucoridae, Notonectidae, and Belostomatidae (Nepomorpha, Heteroptera)
Comparative Cytogenetics ( IF 1 ) Pub Date : 2020-03-05 , DOI: 10.3897/compcytogen.v14i1.48709
Desislava Stoianova , Nikolay Simov , Manh Quang Vu , Duc Minh Nguyen , Snejana Grozeva

We report the karyotype, some aspects of spermatogenesis, and ovarian trophocytes ploidy in three aquatic bug species: Ilyocoris cimicoides (Linnaeus, 1758), Notonecta glauca Linnaeus, 1758, and Diplonychus rusticus Fabricius, 1871 from previously unexplored regions – South Europe (Bulgaria) and Southeast Asia (Vietnam). Our results add considerable support for the published karyotype data for these species. In I. cimicoides, we observed achiasmate male meiosis – the first report of achiasmy for the family Naucoridae. More comprehensive cytogenetic studies in other species of the Naucoridae are required to elucidate the role of achiasmy as a character in the systematics of the family. Our observations on the association between phases of spermatogenesis and developmental stages in I. cimicoides and N. glauca differ from the previously published data. In these species, we assume that the spermatogenesis phases are not strongly associated with certain developmental stages. For further cytogenetic studies (on the Balkan Peninsula), we recommend July as the most appropriate month for collection of I. cimicoides and N. glauca. In the ovaries of both species, we studied the level of ploidy in metaphase and interphase trophocytes. In I. cimicoides, diploid and tetraploid metaphase trophocytes were found. Heteropycnotic elements, observed in interphase trophocytes of this species, represented the X chromosomes. It allowed us to determine the trophocytes ploidy at interphase (2n was repeated up to 16 times). The situation with N. glauca was different. The metaphase trophocytes were diploid and we were not able to determine the ploidy of interphase trophocytes since such conspicuous heteropycnotic elements were not found. The scarce data available suggest a tendency for a low level of trophocyte ploidy in the basal infraorders (Nepomorpha and Gerromorpha) and for a high level in the more advanced Pentatomomorpha. Data about this character in species from other infraorders are needed to confirm that tendency.

中文翻译:

Naucoridae,Notonectidae和Belostomatidae家族(Nepomorpha,Heteroptera)的三种水生昆虫物种的核型,精子发生和卵巢营养细胞倍性的新数据

我们报告了三种水生小虫物种的核型,精子发生的某些方面以及卵巢滋养细胞的倍性:伊利亚科里斯cimicoides(Linnaeus,1758年),白叶夜蛾(Notonecta glauca Linnaeus,1758年)和Diplonychus Rustus Fabricus,1871年从以前未开发的地区–南欧(保加利亚)和东南亚(越南)。我们的结果为这些物种的核型数据提供了相当大的支持。在烟蓟马(I. cimicoides)中,我们观察到了花生四哥的减数分裂现象-这是Naucoridae家族的花生四哥的第一个报道。需要对其他鹦鹉科物种进行更全面的细胞遗传学研究,以阐明花生四烯酸作为家庭系统中的一个角色的作用。我们对西米茄和北山羊精子形成阶段与发育阶段之间关系的观察。glauca与以前发布的数据不同。在这些物种中,我们假设精子发生阶段与某些发育阶段没有强烈关联。对于进一步的细胞遗传学研究(在巴尔干半岛),我们建议将七月作为最合适的月份收集七叶蝉和青冈猪笼草。在这两个物种的卵巢中,我们研究了中期和间期营养细胞的倍性水平。在烟蓟马中发现了二倍体和四倍体中期营养细胞。在该物种的相间滋养细胞中观察到的异养元素代表了X染色体。它使我们能够确定相间的滋养细胞倍性(2n重复多达16次)。N. glauca的情况有所不同。中期营养细胞是二倍体,我们无法确定间质营养细胞的倍性,因为未发现这种明显的异养性元素。可用的稀缺数据表明,基底亚基(Nepomorpha和Gerromorpha)的营养细胞倍性水平较低,而更高级的Pentatomomorpha的营养水平较高。需要来自其他基础物种的物种中有关此特征的数据来确认这种趋势。
更新日期:2020-03-05
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