An early origin of plastids within the cyanobacterial divergence is suggested by evolutionary trees based on complete 16S rRNA sequences.
An early origin of plastids within the cyanobacterial divergence is suggested by evolutionary trees based on complete 16S rRNA sequences.
复制标题
基于完整 16S rRNA 序列的进化树表明，蓝藻分歧内质体的早期起源。
DOI：
10.1093/oxfordjournals.molbev.a040289
复制
发表时间：
1995
影响因子：
10.7
通讯作者：
R. Wachter
中科院分区：
文献类型：
--
作者：
B. Nelissen;Y. V. D. Peer;A. Wilmotte;R. Wachter
目前普遍认为质体起源于一个蓝藻祖先，但蓝藻与质体之间的确切系统发育关系仍存在争议。基于部分16S rRNA序列的大多数研究表明，在蓝藻分歧的质体的起源相对较晚。为了明确蓝藻和质体的亲缘关系和分化顺序，我们在16SrRNA基因序列的基础上研究了它们的同源性。数据集包括来自不同形态组的15株蓝藻，1个原绿藻，和属于8种植物和12种不同藻类的质体。这一组包括本研究中确定的三种蓝藻序列。这是迄今为止使用的最全面的一套完整的蓝藻和质体16S rRNA序列。采用邻接法和最大简约法构建系统树，并采用不同方法对树拓扑结构的可靠性进行了检验。我们的研究结果表明，早期起源的质体内的蓝藻分歧，之前只有两个蓝藻属的分歧，粘细菌和Pseudanabaena。
It is generally accepted that the plastids arose from a cyanobacterial ancestor, but the exact phylogenetic relationships between cyanobacteria and plastids are still controversial. Most studies based on partial 16S rRNA sequences suggested a relatively late origin of plastids within the cyanobacterial divergence. In order to clarify the exact relationship and divergence order of cyanobacteria and plastids, we studied their phylogeny on the basis of nearly complete 16S rRNA gene sequences. The data set comprised 15 strains of cyanobacteria from different morphological groups, 1 prochlorophyte, and plastids belonging to 8 species of plants and 12 species of diverse algae. This set included three cyanobacterial sequences determined in this study. This is the most comprehensive set of complete cyanobacterial and plastidial 16S rRNA sequences used so far. Phylogenetic trees were constructed using neighbor joining and maximum parsimony, and the reliability of the tree topologies was tested by different methods. Our results suggest an early origin of plastids within the cyanobacterial divergence, preceded only by the divergence of two cyanobacterial genera, Gloeobacter and Pseudanabaena.