| 摘要: |
| 茜草属为茜草科模式属,全球约80种,中国有近一半的物种,是茜草属的重要分布中心,大部分隶属于sect. Oligoneura。但是,该组内各种间的形态特征错综复杂,依靠单个性状不易划定种间界限。该研究在全面衡量sect. Oligoneura组内各种间形态特征的基础上,选取该组20种共171份标本,对其3个数量性状和28个定性性状进行聚类分析和主成分分析。结果表明:在主成分分析中,前3个主成分累积贡献率有46.88%,性状的累积贡献率增长并不明显,但该结果仍与聚类分析结果一致。对前3个主成分贡献较大的特征包括叶形(叶长宽比)、叶柄长度、叶脉、每轮叶片数和生活型等,这些形态性状也是该属传统分类学中重要的物种鉴定特征。该研究结果与分子系统发育结果基本一致,支持该组内ser. Chinenses、R. mandersii group、R. angustissima group和R. siamensis group类群的划分,但并不支持ser. Cordifoliae单独成系。sect. Oligoneura内除少数物种外,大部分物种界限均比较清晰。形态计量学研究为sect. Oligoneura甚至茜草属的物种鉴定与划分提供了重要的参考意义。 |
| 关键词: 茜草属, sect. Oligoneura, 聚类分析, 主成分分析 |
| DOI：10.11931/guihaia.gxzw201609036 |
| 分类号:Q948.2 |
| 文章编号:1000-3142(2017)07-0829-12 |
| Fund project:国家自然科学基金(31370244、31570211); 国家自然科学基金委重大项目(31590820, 31590823); 中国科学院战略重点研究项目(XDB03030112)[Supported by the National Natural Science Foundation of China(31370244, 31570211); Major Program of National Natural Science Foundation of China(31590820, 31590823); Strategic Priority Research Program of the Chinese Academy of Sciences(XDB03030112)]。 |
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| A morphometric study of Chinese Rubia sect. Oligoneura(Rubiaceae: Rubieae) |
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YANG Li-E1, 2, MENG Ying3, NIE Ze-Long3, SUN Hang1*
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1. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Key Laboratory of Plant Resources Conservation and Utilization, College of Biology and Environmental Sciences, Jishou University, Jishou 416000, Hunan, China
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| Abstract: |
| Rubia is the type genus of Rubiaceae, comprising ca. 80 species. China is an important diversity center for Rubia with approximately half of its species, most of which belong to sect. Oligoneura. The morphological variations and taxonomy are complicated in sect. Oligoneura. To provide some statistic evidences for the classification of sect. Oligoneura, we explored a morphometric study based on 20 species(171 specimens)from the section using 28 qualitative and three quantitative characters. Our results showed that the principal components analysis produced the similar result as the cluster analysis, though the accumulation rising slowly with the first three principal components with only 48.56% of the total variations. Contributions to the first three components included leaf shape(leaf length/leaf width), length of leaf petiole, leaf veins, number of leaves in each whorl, and life forms, which were also important to traditional classification of the genus. Our results are congruent with molecular phylogenetic results and support the recognition of ser. Chinensis, R. mandersii group, R. angustissima group and R. siamensis group, but not ser. Cordifoliae. Our results also indicate that most species in sect. Oligoneura can be well distinguished. Therefore, our study suggests that morphometric analysis provides good evidences for species identification and classification within sect. Oligoneura as well as for the whole genus. |
| Key words: Rubia, sect. Oligoneura, cluster analysis, principal components analysis(PCA) |
