The diversity and the evolution of mating systems have been studied in various eukaryotes. Volvox sect. Volvox of the volvocine green algae is suitable for evolutionary studies of the transition from homothallic to heterothallic mating systems because this transition is recognized in distal lineages within Volvox sect. Volvox. MID homologs are important in determining the mating type minus and male in heterothallic species of the volvocine algae. However, MID homologs have not been studied within the entire Volvox sect. Volvox. Here, we analyzed MID homologs from almost all taxa of Volvox sect. Volvox and found no significant differences in MID sequences between homothallic species and males of heterothallic species. Furthermore, MID of the male genotype of the heterothallic Volvox rousseletii showed an expression pattern that was almost identical to that of a closely related homothallic species, Volvox ferrisii. Therefore, the function of MID might have been conserved within the ancestral homothallic lineage of Volvox sect. Volvox and during the evolutionary transition of the heterothallic male genotype from the ancestral homothallic species, possibly related to male gametogenesis.

中文翻译：

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团藻组MID同系物从同宗物种向异宗物种转变过程中的进化分析。团藻（绿藻纲）

人们已经在各种真核生物中研究了交配系统的多样性和进化。沃尔沃克斯教派。沃尔沃辛绿藻的团簇适合于从同宗交配系统到异宗交配系统转变的进化研究，因为这种转变在团团组内的远端谱系中得到了认可。沃尔沃克斯。MID同源物对于确定 volocine 藻类异宗合物种的交配类型阴性和雄性很重要。然而，MID同系物尚未在整个Volvox派别中进行研究。沃尔沃克斯。在这里，我们分析了几乎所有团藻属分类单元的MID同源物。Volvox并发现同宗物种和异宗物种雄性之间的MID序列没有显着差异。此外，异宗合植物Volvox rousseletii的雄性基因型的MID表现出与密切相关的同宗植物物种Volvox ferrisii几乎相同的表达模式。因此， MID的功能可能在团藻组的祖先同宗谱系中得到了保守。团簇和异宗雄性基因型从祖先同宗物种的进化转变过程中，可能与雄性配子发生有关。