Delimitation and phylogeny ofAletris （Nartheciaceae） with implications for perianth evolution  

作　　者：Yi-Min ZHAO Wei WANG Shu-Ren ZHANG 

机构地区：[1]State Key Laboratory of Systematic andEvolutionary Botany,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China [2]Graduate University of Chinese Academy of Sciences,Beijing 100049,China [3]Guangxi Botanical Garden of Medicinal Plants,Narming 530023,China

出　　处：《Journal of Systematics and Evolution》2012年第2期135-145,共11页植物分类学报（英文版）

基　　金：Acknowledgements We are grateful to Ce-Hong LI, Ping ZHUANG, Xiao-Ping LI, and Zhen-Dong FANG for assistance with fieldwork, to Zhong-Chun LUO for the provision of samples ofA. scopulorum, and to Tao WEI, Jian-Hua FAN, and Sheng-Xiang YU for guidance and technical assistance in experiments and data analysis. We greatly appreciate the two reviewers for their valuable comments. This work was supported by the National Natural Science Foundation of China （Grant Nos. 30370104 and 30990241）.

摘　　要：Aletris, containing approximately 21 species, is the largest genus in Nartheciaceae, and is disjunctively distributed in eastern Asia and eastern North America. Its delimitation has been controversial because it is uncertain whether Metanarthecium should be included in the genus. Although there are a few molecular phylogenetic studies on Aletris, the interspecific relationships within the genus have never been evaluated in a phylogenetic context. Here we used two cpDNA loci, matK and trnL-F, to delimitate Aletris and discuss the phylogeny within the genus. Phylogenetic analyses showed Metanarthecium might be distantly related to Aletris. This is also supported by morphological, palynological, cytological, and phytochemical data. Therefore, Metanarthecium should be excluded from Aletris. Within Aletris, there are two major clades： A. farinosa and A. lutea of eastern North America and A. glabra of eastern Asia form clade A; and the remaining Asian species form clade B. The Asian clade includes three subclades： subclade I （two varieties ofA. pauciflora, and A. glandulifera and A. megalantha）, subclade II （three samples of A. laxiflora）, and subclade III （all other sampled Asian species）. Based on phylogenetic relationships, A. pauciflora var. khasiana deserves a specific status, and A. gracilipes, formerly a synonym ofA. laxiflora, should be reinstated. The reconstruction of the perianth evolution indicates that perianth connate halfway and glabrous on abaxial surface are plesiomorphic for Aletris and Nartheciaceae. Farinose-glutinous perianth is a diagnostic character for clade A.Aletris, containing approximately 21 species, is the largest genus in Nartheciaceae, and is disjunctively distributed in eastern Asia and eastern North America. Its delimitation has been controversial because it is uncertain whether Metanarthecium should be included in the genus. Although there are a few molecular phylogenetic studies on Aletris, the interspecific relationships within the genus have never been evaluated in a phylogenetic context. Here we used two cpDNA loci, matK and trnL-F, to delimitate Aletris and discuss the phylogeny within the genus. Phylogenetic analyses showed Metanarthecium might be distantly related to Aletris. This is also supported by morphological, palynological, cytological, and phytochemical data. Therefore, Metanarthecium should be excluded from Aletris. Within Aletris, there are two major clades： A. farinosa and A. lutea of eastern North America and A. glabra of eastern Asia form clade A; and the remaining Asian species form clade B. The Asian clade includes three subclades： subclade I （two varieties ofA. pauciflora, and A. glandulifera and A. megalantha）, subclade II （three samples of A. laxiflora）, and subclade III （all other sampled Asian species）. Based on phylogenetic relationships, A. pauciflora var. khasiana deserves a specific status, and A. gracilipes, formerly a synonym ofA. laxiflora, should be reinstated. The reconstruction of the perianth evolution indicates that perianth connate halfway and glabrous on abaxial surface are plesiomorphic for Aletris and Nartheciaceae. Farinose-glutinous perianth is a diagnostic character for clade A.

关 键 词：Aletris MATK Metanarthecium Nartheciaceae perianth evolution PHYLOGENY trnL-F. 

分 类 号：S634.401[农业科学—蔬菜学] S852.659.5[农业科学—园艺学]