基于SSU序列的串珠藻目植物系统发育分析  

Phylogeny of Batrachospermales(Florideophyceae,Rhodophyta) Inferred from Small-Subunit rDNA Gene Sequences

作　　者：吉莉[1] 陈乐[1] 冯佳[1] 谢树莲[1] 

机构地区：[1]山西大学生命科学学院,太原030006

出　　处：《西北植物学报》2013年第3期472-477,共6页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金(30970187)

摘　　要：通过18SrDNA基因(SSU)序列,构建了串珠藻目植物的系统发育关系。结果显示:SSU基因序列片段长度为1 871bp,核苷酸变异位点有709个,占序列长度的38%;其中简约信息位点有169个,占序列长度的9%。用最大似然法、邻接法和贝叶斯法构建的系统树拓扑结构基本一致,都显示红索藻目的2个属独立于串珠藻目成单独分支,支持红索藻目的建立;胶串珠藻独立于其他串珠藻组植物,支持将其单独分组;数据同时支持将扭曲组和杂生组合并,建立Kumanoa属;但多芒组、绿色组、沼生组等因分子序列数据涉及的种类较少,其系统关系的确定还需要更多的证据。Batrachospermales is an order belonging to Florideophceae,Rhodophyta.It distributes all over the world.China and its adjacent regions are the distribution center.The small-subunit rDNA gene（SSU） sequences from species of Batrachospermales and their relative lineages were used to reconstruct the phylogenetic trees by using the PAUP＊ 4.0b10 and MrBayes 3.1.2 software,which contained 12 samples collected from China and 28 species abroad obtained from GenBank.The results showed that the SSU region sequence was 1 871 bp with 709 variation sites（38%） and 169 parsimony informative sites（9%）.The phylogenetic relationships were inferred using the maximum-likelihood,neighbor-joining,and Bayesian analysis,and three methods produced trees with largely congruent topology.All phylogenetic trees topology got a similar placement of Thoreales,which formed a monophyletic group with high bootstrap support.According to the Bayesian analysis,the conclusion supported that the Thoreales should be classified as a separate order.Three trees all revealed that Batrachospermum gelatinosum is separated from other members of Sect.Batrachospermum and should be classified as a separate Section.The genus Kumanoa should be admitted based on Sect.Contorta and Sect.Hybrida.

关 键 词：串珠藻目 系统发育 SSU 

分 类 号：Q789[生物学—分子生物学] Q949.2