Insights into the evolution of nuclear dualism in the ciliates revealed by phylogenetic analysis of rRNA sequences
Insights into the evolution of nuclear dualism in the ciliates revealed by phylogenetic analysis of rRNA sequences
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DOI：
10.1111/j.1550-7408.1996.tb01396.x
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发表时间：
1996-05-01
影响因子：
2.2
通讯作者：
Raikov, IB
中科院分区：
文献类型：
--
作者：
Hammerschmidt, B;Schlegel, M;Raikov, IB
核核纤毛虫、Loxodes striatus 和 Protocruzia sp. 以及异毛纤毛虫、Climacostum virens 和 Eufolliculina uhligi 的小亚基 rRNA 基因序列被用来测试纤毛门核二元性的进化。使用最小二乘距离法、邻接法和最大简约法得出的系统发育表明，核纤毛虫（Small 和 Lynn，1985）并不形成单系类群。然而，Loxodes 和异毛纤毛虫形成纤毛虫谱系中的第一个分支，而 Protocruzia 分支，按照距离方法，是螺毛毛虫谱系的基础。建议将 Protocruzia 从 Karyorelictea 纲中删除，并置于与螺菌谱系更密切的分类学联系中。核分裂类型沿着系统发育树的分布与不能分裂的大核代表衍生的而不是原始的或“核相关性”特征的概念是一致的。
The small subunit rRNA gene sequences of the karyorelictean ciliates, Loxodes striatus and Protocruzia sp., and the heterotrichian ciliates, Climacostomum virens and Eufolliculina uhligi, were used to test the evolution of nuclear dualism in the Phylum Ciliophora. Phylogenies derived using a least squares distance method, neighbour joining, and maximum parsimony demonstrate that the karyorelictean ciliates sensu Small and Lynn, 1985 do not form a monophyletic group. However, Loxodes and the heterotrich ciliates form the first branch in the ciliate lineage, and Protocruzia branches, in distance methods, basal to the spirotrich lineage. It is proposed that Protocruzia be removed from the Class Karyorelictea, and placed in closer taxonomic association with the spirotrich lineage. The distribution of nuclear division types along the phylogenetic tree is consistent with the notion that macronuclei incapable of division represent a derived rather than a primitive or ''karyorelictid'' character trait.