A study on the phylogeny and species diversity of the genus Cryptocarya in China
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摘要: 本研究利用形态性状和2个分子标记（ITS和RPB2），对国产厚壳桂属（Cryptocarya）物种进行系统发育研究，并简要分析其物种多样化的成因。结果显示，形态和分子证据均支持将国产厚壳桂属物种划分为两个组：离基三出脉组和羽状脉组。云南、海南、广西和广东地区可能是国产厚壳桂属物种分化的“摇篮”，这些地区分布着我国90%以上的厚壳桂属物种。大多数国产厚壳桂物种形态特征十分相似，分子序列也没有显著差异，推测可能是近期物种快速分化形成所致。Abstract: We combined morphological characters and molecular markers (ITS and RPB2) to study the phylogeny of Cryptocarya species in China, and briefly discussed the causes of species diversity. Results showed that both morphological and molecular evidence supported the division of Cryptocarya species in China into two groups according to their leaf venation characters:i.e., triplinerved leaf group and pinninerved leaf group. Furthermore, Hainan, Yunnan, Guangxi, and Guangdong may be the "cradles" of species differentiation, with more than 90% of Chinese Cryptocarya species distributed in these areas. The morphological characters of most Cryptocarya species in China were very similar, and there were no significant differences in their molecular sequences. This may be due to recent rapid radiation of the species.
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Keywords:
- Cryptocarya /
- Morphological characters /
- Molecular phylogeny /
- Species diversity /
- Rapid radiation
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