Abstract
Although polyphyly of Osmanthus has been suggested by different authors, the conclusions of previous studies have lacked robust support due to limited sampling or a paucity of phylogenetic characters. In this study, the phylogeny of Osmanthus was explored using sequences of three informative chloroplast regions (psbJ-petA, rpl32-trnL and rps16-trnQ), including all the five sections of the genus and eight closely related genera. The results confirm that Osmanthus, as presently circumscribed, is a polyphyletic group, containing three or four distinct lineages, i.e. sect. Leiolea (lineage I), sect. Notosmanthus (lineage III), sects. Osmanthus (excluding O. decorus), Siphosmanthus and Linocieroides (lineage IV), and an uncertain lineage including only O. decorus (lineage II). These results emphasize that the generic delimitation within subtribe Oleinae is in need of revision. In addition, this study found that the four cultivar groups of sweet osmanthus formed a paraphyletic clade, implying that cultivated sweet osmanthus might originate from several species.
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Acknowledgments
The authors are indebted to Drs. Guillaume Besnard of the Department of Ecology and Evolution, University of Lausanne, Jeremy J. Bruhl of NCW Beadle Herbarium (NE), James C. Solomon of the Herbarium Missouri Botanical Garden, Michael S. Dosmann and Kathryn Richardson of the Arnold Arboretum of Harvard University, Jordi López-Pujol of the Botanic Institute of Barcelona, and Philip Thomas of the Royal Botanic Garden Edinburgh, for their kind help in collecting DNA samples. Special appreciation goes to Dr. Eva Wallander for her valuable comments and linguistic help. This study is supported by the Natural Science Foundation of Jiangxi Province (0630047), the National Natural Science Foundation of China (30760016) and the Cultivation Program for Young Scientist of Jiangxi Province (2008DQ01500).
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Guo, SQ., Xiong, M., Ji, CF. et al. Molecular phylogenetic reconstruction of Osmanthus Lour. (Oleaceae) and related genera based on three chloroplast intergenic spacers. Plant Syst Evol 294, 57–64 (2011). https://doi.org/10.1007/s00606-011-0445-z
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DOI: https://doi.org/10.1007/s00606-011-0445-z