广西植物Issue(1)：61-72,12.DOI:10.11931/guihaia.gxzw201504020
瑞香属和荛花属的数量分类研究
Numerical taxonomy of the genera Daphne and Wikstroemia
摘要
Abstract
Daphne and Wikstroemia are members of subfamily Thymelaeoideae which belongs to Thymelaeaceae. There are 95 species ( varieties) in genus Daphne, 52 of which distribute in China. There are 70 species( varieties) in genus Wikstroemia and 49 species( varieties) can be found in China. Southwest China is the species diversification center of the two genera. Petals of Daphne and Wikstroemia degenerate and usually form circular disc or linear disc scale. Convention-ally, the shape of disc and type of fruit were used as crucial characters to separate the two genera. The circular disc fre-quently occurs in Daphne while linear disc scale occurs in Wikstroemia. Meanwhile, fruit is usually succulent berry in Daphne, but Wikstoemia has dry or leathery fruit, and sometimes enclosed by persistent calyx. However, alternational characters among species of the two genera have been reported and some species have both kinds of characters. In this study, 32 morphological characters were used in the numerical taxonomy of 77 species( varieties) from genus Daphne and 62 species(varieties) from genus Wikstroemia with clustering and principal component analysis. UPGMA clustering re-sults revealed that neither genera formed monophyletic group species from the two genera clustered together. In the prin-cipal components analysis, the cumulative percent of the first three principal components presented 35.56%, while the conventional taxonomic characters, such as the disc shape, phyllotaxy and the fruit type, contribute minor effects on the first three components. So, taxonomic distinguishable characters of the two genera could not separate them clearly. Three-dimensional scatter plots based on principal components analysis revealed that species from both genera embeded with each other and did not separate two genera as monophyletc group. Neither clustering analysis nor principal components a-nalysis supported the traditional taxonomy that Daphne and Wikstroemia were naturally monophyletic groups.关键词
数量分类/瑞香属/荛花属/聚类分析/主成分分析/单系Key words
numerical taxonomy/Daphne/Wikstroemia/clustering analysis/principal components analysis/monophy-letic group分类
农业科技引用本文复制引用
张永增,孙文光,蒋鑫,李志敏,张永洪..瑞香属和荛花属的数量分类研究[J].广西植物,2016,(1):61-72,12.基金项目
国家自然科学基金委－云南省联合基金重点项目(U1136601)；国家自然科学基金(31360049，31160045，31460050)；系统与进化植物学国家重点实验室开放项目(LSEB2012-04)；国家科技基础性工作专项(2013FY112100)；中国科学院“西部之光”基金(2012)[Supported by the National Natural Science Foundation of China-Key Project of the Joint Fund of Yunnan Province(U1136601)；National Natural Science Foundation of Chi-na(31360049，31160045，31460050)； Open Project of the State Key Laboratory of Systems and Evolutionary Botany(LSEB2012-04)； Foundation of Science and Technology Basic Work(2013FY112100)；West Light Foundation of the Chinese Academy of Sciences(2012)]。 （U1136601）
