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基部藓类分子系统学研究
引用本文:李姝婧,贾渝,王庆华.基部藓类分子系统学研究[J].植物学通报,2012,47(4):379-394.
作者姓名:李姝婧  贾渝  王庆华
作者单位:中国科学院植物研究所系统与进化植物学国家重点实验室,北京,100093
基金项目:基金项目:国家自然科学基金(No.30970189)致谢感谢美国纽约植物园标本馆惠借标本.感谢美国康涅狄克大学Dr.Goffinet和刘阳先生以及首都师范大学何奕昆教授和李学东老师提供相关实验材料.
摘    要:基部藓类是稳定地处于藓类系统发育树基部的类群.它包括7纲,2亚纲,10目,10科,34属,637种.基部藓类虽然只占藓类种类的5%,但由于其内部各类群孢子体形态极为丰富,因此对于理解整个藓类植物的系统发育具有重要意义.通过对48个种(36个藓类、4个维管植物、2个角苔、4个苔类和2个藻类)的9个DNA片段(NU:26S,18S; MT:nad5,cox1; CP:rbcL,rps4,cp-LSU,cp-SSU,atpB)进行分子系统学分析,综合最大似然法(maximum likelihood)、最大简约法(most parsimony)和贝叶斯分析(Bayesian inference)方法的建树结果,理清了前人研究中存在冲突的类群之间的关系并为已确定的关系提供了更高的支持率.研究结果如下:(1)藻苔纲和泥炭藓纲互为姐妹类群,处于整个藓类的最基部;(2)黑藓纲与黑真藓纲互为姐妹类群(3)长台藓纲和具齿藓类组成单系;(4)四齿藓纲是所有具齿藓类的基部类群;(5)烟杆藓亚纲处于真藓纲的最基部,其次是短颈藓亚纲.以上结论在分子系统树上得到了很高的支持率.

关 键 词:基部藓类  苔藓  分子系统学  多基因联合

Molecular Phylogenetic Relationships Among Basal Mosses
Shujing Li , Yu Jia , Qinghua Wang.Molecular Phylogenetic Relationships Among Basal Mosses[J].Chinese Bulletin of Botany,2012,47(4):379-394.
Authors:Shujing Li  Yu Jia  Qinghua Wang
Institution:State Key Laboratory of Systematic and Evolutionary, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
Abstract:Basal mosses are stable at the base of phylogenetic trees. Although they are a small part of mosses (10 families in 7 classes and 2 subclasses), they receive considerable attention because of their abundant morphological variations and importance in resolving the phylogeny of Bryophyta. We used maximum likelihood, Bayesian analysis and most parsimonious methods with data for 9 regions (26S, 18S, nad5, cox1, rbcL, rps4, cp-LSU, cp-SSU, atpB) to estimate the phylogenetic relationships of 48 species (36 mosses, 4 tracheophytes, 2 hornworts, 4 liverworts and 2 algaes). We resolved the previous incongruence among basal mosses and provide strong support for previous resolutions. The phy- Iogenetic tree with high statistical support showed that (1) Takakiopsida and Sphagnopsida form a sister group at the base of the moss linage; (2) Andreaeopsida is sister to Andreaeobryopsida; (3) Oedipodiopsida forms a sister group with all the peristomate mosses; (4) Tetraphidopsida is sister to the clade unifying Polytrichopsida and Arthrodontous taxa; and (5) Buxbaumiidae is at the base of Bryopsida, followed by Diphysciidae.
Keywords:basal mosses  bryophyta  molecular phylogeny  multi-genome phylogeny
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