Phylogenetic analysis of phagotrophic, photomorphic and osmotrophic euglenoids by using the nuclear 18S rDNA sequence.
Phylogenetic analysis of phagotrophic, photomorphic and osmotrophic euglenoids by using the nuclear 18S rDNA sequence.
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DOI：
10.1099/00207713-51-3-783
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发表时间：
2001-05
影响因子：
2.8
通讯作者：
A. N. Müllner;D. Angeler;R. Samuel;E. Linton;R. Triemer
中科院分区：
文献类型：
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作者：
A. N. Müllner;D. Angeler;R. Samuel;E. Linton;R. Triemer
利用SSU rDNA序列对35个菌株（包括25个已发表的序列和10个新测序的序列）进行了系统发育分析，其中包括2个眼虫属（Euglena）种、5个扁裸藻属（Phacus）种和3个Astasia种。简约性、距离和最大似然推断的同源性支持（1）眼虫的单系性，（2）动质体作为姐妹群，（3）嗜食的Cantuscygni PetalomonasCann et Pennick锚定了眼虫谱系的基础，（4）眼虫内光养的进化来自单一事件，（5）营养型裸藻的多源性;（6）Euglena Euglberg和Phacus Dujardin的多系性。分析还表明，鳞孔藻、囊裸藻和Astasia Dujardin是复系的。此外，研究结果表明，无论是裸藻目还是Eutreptiales形成一个单系谱系，从而质疑目前可用的分类。关于营养的摄食模式，数据表明，摄食器出现多次。
Phylogenetic analyses of 35 strains including 25 previously published sequences and 10 which have been newly sequenced, representing two species of Euglena, five species of Phacus and three species of Astasia, were carried out using the SSU rDNA. Parsimony, distance and maximum-likelihood inferred phylogenies support (1) monophyly of the euglenoids, (2) kinetoplastids as the sister group, (3) the phagotrophic Petalomonas cantuscygni Cann et Pennick anchoring the base of the euglenoid lineage, (4) evolution of phototrophy within the euglenoids from a single event, (5) multiple origins of osmotrophic euglenoids and (6) polyphyly of the genera Euglena Ehrenberg and Phacus Dujardin. Analyses also indicate that Lepocinclis Perty, Trachelomonas Ehrenberg and Astasia Dujardin are polyphyletic. In addition, the results suggest that neither the Euglenales nor the Eutreptiales form a monophyletic lineage, thus questioning currently available classifications. Concerning the phagotrophic mode of nutrition, the data suggest that the feeding apparatus arose multiple times.