| 摘要: |
| 沼兰族是兰科植物的大族之一,约2 000种,除了极地和沙漠地区,全球均有分布。该族植物主要分布在热带地区,尤其在东南亚、热带美洲、非洲以及澳大利亚等地区种类非常丰富。目前,已有关于该族植物形态和分子系统的研究,但有关该族亚族和属间的系统关系尚不清楚,属的界定争议也较大。该文基于核基因片段ITS和叶绿体基因片段matK序列,采用最大简约法、最大似然法贝叶斯推理分析法,对现有沼兰族主要属的123种植物和10个外类群植物进行了分子系统学研究。结果表明:沼兰族主要分为3个亚族分支,包括附生的鸢尾兰亚族(Oberoniinae)、地生的羊耳蒜亚族(Liparidinae)和沼兰亚族分支(Crepidium clade)。鸢尾兰亚族包括6个属、羊耳蒜亚族分支包括5个属、沼兰亚族分支包括4个属; 丫瓣兰亚族(Ypsilorchidinae)应归并为鸢尾兰亚族; Disticholiparis属与Stichorkis属的模式标本相同,应并入Stichorkis属; 沼兰属(Crepidium)和无耳沼兰属(Dienia)的唇瓣结构差异较大,但二者均为单系类群。此外,在收集野外实验材料过程中,发现了2种产自中国西南部和越南北部的沼兰族新种,分别命名为麻栗坡羊耳蒜(Platystyliparis malipoensis G. D. Tang,X. Y. Zhuang & Z. J. Liu)和秉滔羊耳蒜(Cestichis pingtaoi G. D. Tang,X. Y. Zhuang & Z. J. Liu)。 |
| 关键词: 沼兰族 核基因ITS matK 系统学 并系类群 |
| DOI：10.11931/guihaia.gxzw201506015 |
| 分类号:Q943 |
| Fund project: |
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| Phylogenetic analysis of Malaxideae(Orchidaceae: Epidendroideae): two new species based on the combined nrDNA ITS and chloroplast matK sequences |
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TANG Guang-Da1,2, ZHANG Guo-Qiang2, HONG Wen-Jun1,
LIU Zhong-Jian1,2, ZHUANG Xue-Ying1*
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1. College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China;2. Shenzhen Key Laboratory for Orchid Conservation and Utilization, The National Orchid Conservation Center
of China and The Orchid Conservation and Research Center of Shenzhen, Shenzhen 518114, China
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| Abstract: |
| Malaxideae is a larger cosmopolitan orchid tribe consisting of nearly 2 000 species and is distributed worldwide,excluding the polar and desert regions. It is abundant in the tropical regions,particularly in Australia,and the tropical Asia,Southeast Asia,the tropical Americas and Africa. Molecular and morphological analyses have been performed to establish the phylogenetic relationships within this tribe. However,the subtribe and intergeneric relationships remain unclear,and the genus definition of this tribe is considerably controversial. The maximum parsimony,maximum likelihood and Bayesian inference analyses were performed based on the combined sequences of the nuclear ITS and chloroplast matK genes of 133 taxa(10 other allied species as outgroups),which represent nearly all of the major genera of the Malaxideae. These results suggested that Malaxideae could be divided into three clades,the epiphytic Oberoniinae,the terrestrial Liparidinae,and a terrestrial Crepidium clade. The Oberoniinae and Liparidinae could be divided into six genera and five genera respectively,and Crepidium clade camposes of four genera. The subtribe Ypsilorchidinae should be attributed to Oberoniinae. Disticholiparis should be removed because it shared the same type with Stichorkis. The phylogenetic relationship of Crepidium and Dienia is monophyletic,although they have different lip structures. In addition,two new species found in Southwest China and northern Vietnam,Platystyliparis malipoensis G. D. Tang,X. Y. Zhuang & Z. J. Liu and Cestichis pingtaoi G. D. Tang,X. Y. Zhuang & Z. J. Liu,were described based on the molecular analysis and morphological observation. |
| Key words: Malaxideae nrDNA ITS matK phylogeny Paraphyletic |
