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研究测定了寄生于草鱼肠道的鲩肠袋虫的18S rDNA序列。鲩肠袋虫的18S rDNA基因序列包括1638个碱基。分别用3种分析方法(邻接法、最大简约法、贝叶斯法)构建了毛口亚纲的系统发育树,得到结果如下:均支持毛口亚纲为单系发生且内分前庭目、内毛目和澳大利亚枝3个类群(100%Bay、100%MP、100%NJ);均支持内毛目(100%Bay、98%MP、93%NJ)、澳大利亚枝(100%Bay、97%MP、99%NJ)的单系性和前庭目的并系性。3种构树方法都支持鲩肠袋虫与澳大利亚枝聚类(100%Bay、100%MP、100%NJ),而后与“内毛目+前庭目(部分)”构成姊妹群(100%Bay、85%MP、72%NJ);而结肠小袋纤毛虫与“澳大利亚枝+鲩肠袋虫”以及“内毛目+前庭目(部分)”分枝并列,共同构成毛口亚纲(100%Bay、100%MP、100%NJ)。这暗示了肠袋虫类群在系统发育上的并系性和其分类阶元的提升。
The 18S rDNA sequence of the S. aurantiacus parasitized in the grass carp intestinal tract was determined. The intestinal bagworm 18S rDNA gene sequence includes 1638 bases. The phylogenetic trees of the subfamilies Subfamilies were constructed by three analytical methods (adjoining method, maximum parsimony method and Bayesian method). The results were as follows: Inner Mongolia and Australian branches of three species (100% Bay, 100% MP, 100% NJ); all supported the Inner Head (100% Bay, 98% MP, 93% NJ) % MP, 99% NJ) and systematic and vestibular purposes. All three tree-based methods support clustering (100% Bay, 100% MP, 100% NJ) of S. aurantiacus and Australian branches, and then constitute a sister group with the Inner Head + Heads % Bay, 85% MP, 72% NJ); while the colon pyloric coccidian and the “Australian branch + 鲩 intestinal bagworm” and "inner head + vestibular head (part) Ostrea (100% Bay, 100% MP, 100% NJ). This suggests that the symbiotic nature of the intestinal worms in phylogeny and their taxonomic ascension.