Circumscription of Primula subgenus Auganthus (Primulaceae) based on chloroplast DNA sequences  

作　　者：Hai-Fei YAN Chong-Hua HE Ching-I PENG Chi-Ming HU Gang HAO 

机构地区：[1]South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China [2]College of Life Sciences, South China Agricultural University, Guangzhou 510642, China [3]Research Center for Biodiversity, Academia Sinica, Nankang, Taipei 115, China

出　　处：《Journal of Systematics and Evolution》2010年第2期123-132,共10页植物分类学报（英文版）

基　　金：supported financially by the National Science Foundation of China (grants 40671066 and 30870171)

摘　　要：Recent molecular phylogenetic analyses of Primula have greatly enhanced our understanding of the infrageneric relationships of the genus, but the subgenera Auganthus and Carolinella remain meagerly sampled and poorly understood. In the present study, nucleotide sequence data of three chloroplast DNA regions （matK, rpsl6, and trnL-F） were used to infer phylogenetic relationships of the subgenera Auganthus and Carolinella. Sequence data were acquired and analyzed for 70 species of Primula and its close relatives. The data matrix included 29 species （42%） of subgenus Auganthus and five species （50%） from subgenus Carolinella. Phylogenetic analyses on these data showed that the sampled species of the subgenus Carolinella do not form a monophyletic clade, but are dispersed among the species of the subgenus Auganthus. Therefore, neither subgenus Auganthus nor Carolinella is monophyletic under their current circumscriptions. The distinctive calyptrate capsule that was previously used as a diagnostic criterion for subgenus Carolinella was inferred to have evolved multiple times in Primula based on the phylogeny. Our analysis also confirmed that Cortusa is nested within subgenus Auganthus. We therefore suggest a revised circumscription of subgenus Auganthus to include subgenus Carolinella and the genus Cortusa. Several clades were identified with this broadly defined subgenus Auganthus by the phylogenetic analyses, but their relationships remain incompletely resolved.Recent molecular phylogenetic analyses of Primula have greatly enhanced our understanding of the infrageneric relationships of the genus, but the subgenera Auganthus and Carolinella remain meagerly sampled and poorly understood. In the present study, nucleotide sequence data of three chloroplast DNA regions （matK, rpsl6, and trnL-F） were used to infer phylogenetic relationships of the subgenera Auganthus and Carolinella. Sequence data were acquired and analyzed for 70 species of Primula and its close relatives. The data matrix included 29 species （42%） of subgenus Auganthus and five species （50%） from subgenus Carolinella. Phylogenetic analyses on these data showed that the sampled species of the subgenus Carolinella do not form a monophyletic clade, but are dispersed among the species of the subgenus Auganthus. Therefore, neither subgenus Auganthus nor Carolinella is monophyletic under their current circumscriptions. The distinctive calyptrate capsule that was previously used as a diagnostic criterion for subgenus Carolinella was inferred to have evolved multiple times in Primula based on the phylogeny. Our analysis also confirmed that Cortusa is nested within subgenus Auganthus. We therefore suggest a revised circumscription of subgenus Auganthus to include subgenus Carolinella and the genus Cortusa. Several clades were identified with this broadly defined subgenus Auganthus by the phylogenetic analyses, but their relationships remain incompletely resolved.

关 键 词：Auganthus calyptrate capsule Carolinella CIRCUMSCRIPTION PRIMULA Primulaceae. 

分 类 号：Q949.773[生物学—植物学] S512.101[农业科学—作物学]