蝽科精巢细胞减数分裂染色体行为及其反映的属种间亲缘关系

为探讨蝽科精巢细胞减数分裂各时期染色体形态和行为差异， 以及据此反映的属种间亲缘关系， 采用常规染色体制片法对蝽科6属9种精巢细胞减数分裂各期染色体形态特征、 行为及精子的形成进行了观察和比较研究。结果表明： 蝽科精巢细胞为交叉型减数分裂， “O”型交叉为其典型交叉减数分裂形式。各属种减数分裂各期染色体行为相似， 但形态不同。减数分裂各期染色体形态、 排列方式， 中期染色体相对长度、 组成与核型以及精子形态等特征具有属种间差异性。蝽科精巢细胞中期Ⅰ染色体组平均相对长度都为12.5， 在进化过程中染色体组长度信息总量不变。基于染色体相对长度的聚类分析结果显示， 菜蝽属Eurydema、 麦蝽属Aelia、 珠蝽属Rubiconia和条蝽属Graphosoma亲缘关系密切， 而二星蝽属Stollia与果蝽属Carpocoris关系较近。

Chromosome behaviors of testis cells and the implied genetic relationship among the observed genera and species in Pentatomidae (Hemiptera:Pentatomidae)

In order to explore the difference in chromosome morphology and behavior at different phases in the process of meiosis of testis cells, genetic relationship among genera and species, and evolutionary law in Pentatomidae, we observed the chromosome morphology and behaviors and the formation of sperms of testis cells of 9 species belonging to 6 genera of Pentatomidae by using conventional chromosome preparation. The results showed that testis cells of Pentatomidae are "O"-type during the meiosis. The chromosomes of testis cells of Pentatomidae are similar in behavior but different in morphology. The arrangement and relative length of chromosomes, the karyotype and the sperm characteristics are different among genera and species. The average relative length of chromosome sets of the observed species in Pentatomidae is all 12.5. The amount information of chromosome set length of testis cell of Pentatomidae is constant in the evolutionary process. Eurydema, Aelia, Rubiconia and Graphosoma display a close genetic relationship, while Stollia and Carpocoris are more closely related based on the cluster analysis of chromosome relative length of the observed species.