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Phylogeny of the gymnosperm genus Cycas L. (Cycadaceae) as inferred from plastid and nuclear loci based on a large-scale sampling: Evolutionary relationships and taxonomical implications
Liu, Jian1; Zhang, Shouzhou2; Nagalingum, Nathalie3; Chiang, Yu-Chung4,5; Lindstrom, Anders6; Gong, Xun1
2018-10-01
发表期刊MOLECULAR PHYLOGENETICS AND EVOLUTION
ISSN1055-7903
卷号127页码:87-97
摘要The gymnosperm genus Cycas is the sole member of Cycadaceae, and is the largest genus of extant cycads. There are about 115 accepted Cycas species mainly distributed in the paleotropics. Based on morphology, the genus has been divided into six sections and eight subsections, but this taxonomy has not yet been tested in a molecular phylogenetic framework. Although the monophyly of Cycas is broadly accepted, the intrageneric relationships inferred from previous molecular phylogenetic analyses are unclear due to insufficient sampling or uninformative DNA sequence data. In this study, we reconstructed a phylogeny of Cycas using four chloroplast intergenic spacers and seven low-copy nuclear genes and sampling 90% of extant Cycas species. The maximum likelihood and Bayesian inference phylogenies suggest (1) matrices of either concatenated cpDNA markers or of concatenated nDNA lack sufficient informative sites to resolve the phylogeny alone, however, the phylogeny from the combined cpDNA-nDNA dataset suggests the genus can be roughly divided into 13 clades and six sections that are in agreement with the current classification of the genus; (2) although with partial support, a Glade combining sections Panzhihuaenses + Asiorientales is resolved as the earliest diverging branch; (3) section Stangerioides is not monophyletic because the species resolve as a grade; (4) section Indosinenses is not monophyletic as it includes Cycas macrocarpa and C. pranburiensis from section Cycas; (5) section Cycas is the most derived group and its subgroups correspond with geography.
关键词Cycads Infrageneric relationship Paleotropics Recent radiation Taxonomy Gymnosperm
资助信息United Fund of the National Natural Science Foundation of China; Yunnan Natural Science Foundation
收录类别SCI
语种英语
资助项目United Fund of the National Natural Science Foundation of China ; Yunnan Natural Science Foundation[U1136602]
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文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/63301
专题中国科学院昆明植物研究所
通讯作者Lindstrom, Anders; Gong, Xun
作者单位1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming 650201, Yunnan, Peoples R China
2.Shenzhen & Chinese Acad Sci, Fairylake Bot Garden, Shenzhen Key Lab Southern Subtrop Plant Divers, Shenzhen 518004, Peoples R China
3.Calif Acad Sci, Inst Biodivers Sci & Sustainabil, San Francisco, CA 94118 USA
4.Natl Sun Yat Sen Univ, Dept Biol Sci, Kaohsiung 804, Taiwan
5.Kaohsiung Med Univ, Dept Biomed Sci & Environm Biol, Kaohsiung 807, Taiwan
6.Nong Nooch Trop Bot Garden, Sattahip 20250, Chon Buri, Thailand
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Liu, Jian,Zhang, Shouzhou,Nagalingum, Nathalie,et al. Phylogeny of the gymnosperm genus Cycas L. (Cycadaceae) as inferred from plastid and nuclear loci based on a large-scale sampling: Evolutionary relationships and taxonomical implications[J]. MOLECULAR PHYLOGENETICS AND EVOLUTION,2018,127:87-97.
APA Liu, Jian,Zhang, Shouzhou,Nagalingum, Nathalie,Chiang, Yu-Chung,Lindstrom, Anders,&Gong, Xun.(2018).Phylogeny of the gymnosperm genus Cycas L. (Cycadaceae) as inferred from plastid and nuclear loci based on a large-scale sampling: Evolutionary relationships and taxonomical implications.MOLECULAR PHYLOGENETICS AND EVOLUTION,127,87-97.
MLA Liu, Jian,et al."Phylogeny of the gymnosperm genus Cycas L. (Cycadaceae) as inferred from plastid and nuclear loci based on a large-scale sampling: Evolutionary relationships and taxonomical implications".MOLECULAR PHYLOGENETICS AND EVOLUTION 127(2018):87-97.
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