A molecular phylogenetic study of Hemsleya (Cucurbitaceae) based on ITS, rpl16, trnH-psbA, and trnL DNA sequences |
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Authors: | Hong-Tao Li Jun-Bo Yang De-Zhu Li Michael Möller Amin Shah |
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Institution: | 1. Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, 650204, Kunming, Yunnan, China 2. The Graduate School of Chinese Academy of Sciences, 100049, Beijing, China 3. Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, Scotland, UK
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Abstract: | This paper presents the first molecular phylogeny of the genus Hemsleya using nuclear ITS and plastid trnH-psbA, rpl16, and trnL DNA sequences to examine the relationships among Hemsleya species. Phylogenetic relationships were elucidated using a combined analysis of all four datasets, however, the number of parsimony-informative characters was still insufficient to resolve all relationships. Parsimony and Bayesian trees were highly congruent. Twenty-three species of Hemsleya split into two major clades corresponding to two subgenera, i.e., subg. Graciliflorae and subg. Hemsleya. These results are partly in agreement with Li’s sectional classification. However, the molecular data are inconsistent with Li’s classification at the subsectional level. The molecular phylogeny revealed a striking overall correlation between the phylogenetic relationships of the species and their geographical distribution. The Kangdian ancient landmass could be the center of origin of the genus. |
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