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首页> 外文期刊>Molecular phylogenetics and evolution >Phylogenetic relationships between flies of the Tephritinae subfamily (Diptera, Tephritidae) and their symbiotic bacteria
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Phylogenetic relationships between flies of the Tephritinae subfamily (Diptera, Tephritidae) and their symbiotic bacteria

机译：蝇科亚科（双翅目，蝇科）与共生细菌之间的亲缘关系

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摘要

The Tephritinae is considered the most specialized subfamily of fruit flies, predominantly infesting flowerheads of Asteraceae. Some species are known to host specific non-culturable symbiont bacteria ("Candidatus Stammerula spp.") in the midgut. In this work we (i) examined the phylogenetic relationships among the insect hosts, (ii) investigated the presence of bacteria in other hitherto unexamined species, and (iii) evaluated the phylogenetic congruence between insects and symbionts. A total of 33 Tephritinae species in 17 different genera were analyzed. Two regions of the mitochondrial DNA (16S rDNA and COI-tRNALeu-COII) were examined in the insect host, while the 16S was analyzed in the bacteria. From the phylogenetic trees, four of the five tribes considered were statistically supported by each of the clustering methods used. Species belonging to the tribe Noeetini never clustered at significant levels. The phylogenetic COI-tRNALeu-COII tree showed internal nodes more highly supported than the 16S phylogeny. The analysis of the distribution of symbiosis across the subfamily has highlighted the presence of bacteria only in the tribe Tephritini and in the genus Noeeta from the tribe Noeetini. A cophylogenetic analysis revealed a substantial congruence between hosts and symbionts. The interesting exceptions can be justified by events like losses, duplications and hosts switching opportunities, which are likely to arise during the biological cycle of the fly in consideration of the extracellular status of these symbionts.
机译：蝇科被认为是果蝇的最特殊的亚科，主要侵染菊科的花头。已知某些物种在中肠宿主有特定的不可培养的共生细菌（“ Candidatus Stammerula spp。”）。在这项工作中，我们（i）研究了昆虫宿主之间的系统发育关系，（ii）研究了其他迄今未经检查的物种中细菌的存在，并且（iii）评估了昆虫与共生体之间的系统发育一致性。分析了17个不同属中的33种T科。在昆虫宿主中检查了线粒体DNA的两个区域（16S rDNA和COI-tRNALeu-COII），而在细菌中分析了16S。从系统发育树中，所考虑的五个部落中的四个在统计学上都受到所使用的每种聚类方法的支持。属于Noeetini部落的物种从来没有大量聚集。系统发育的COI-tRNALeu-COII树显示出比16S系统发育更受支持的内部节点。对整个亚科共生分布的分析表明，细菌仅存在于特非利尼部落和Noeetini部落的Noeeta属中。遗传发生分析表明宿主和共生体之间的一致性。考虑到这些共生体的细胞外状态，有趣的例外可以通过诸如损失，重复和寄主转换机会之类的事件来证明，这些事件很可能在果蝇的生物循环过程中出现。

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