Abstract
Ceropegia includes more than 200 species distributed in the Old World ranging from the Canary Islands to Australia. In India, there are about 50 species described on a morphological basis as belonging to Ceropegia, and most of them are endemic to the Western Ghats. To investigate evolutionary relationships among Indian Ceropegia taxa and their allies, a phylogenetic analysis was conducted to include 31 Indian taxa of Ceropegia and Brachystelma and their congeners from other geographical regions using nuclear ribosomal internal transcribed spacer (ITS) and three noncoding chloroplast DNA (cpDNA) sequences, including intergenic spacers trnT-L and trnL-F, and trnL intron. The Western Ghats Ceropegia species were found to be most closely related to Indian Brachystelma, with the two genera being placed sister to each other in the ITS phylogeny or with the Brachystelma clade nested within one of the two subclades of Indian Ceropegia in the cpDNA phylogeny. In contrast, Ceropegia species from other regions and African Brachystelma all formed separate clades basal to the Indian Ceropegia–Brachystelma clade. Thus, it can be concluded that the classical morphology-based delineation of the two genera needs revision to reflect their phylogenetic relationships, which are more in accordance with their geographical origin than with morphology.
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Acknowledgments
This research was supported by a seed funding grant for basic research to Mei Sun and a postgraduate studentship to Siddharthan Surveswaran from the University of Hong Kong. We wish to thank S. Karuppusamy and T. Pullaiah for help in obtaining three of the specimens used in this study, and the two anonymous reviewers for comments to improve the manuscript.
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Surveswaran, S., Kamble, M.Y., Yadav, S.R. et al. Molecular phylogeny of Ceropegia (Asclepiadoideae, Apocynaceae) from Indian Western Ghats. Plant Syst Evol 281, 51–63 (2009). https://doi.org/10.1007/s00606-009-0182-8
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DOI: https://doi.org/10.1007/s00606-009-0182-8