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TAXON

Plant Diversity and Resources

Journal of Systematics and Evolution

Volume 46 Issue 3, Pages 322C332.

Published Online: 18 May 2008

DOI: 10.3724/SP.J.1002.2008.08065

Phylogenetic inferences in Prunus (Rosaceae) using chloroplast ndhF and nuclear ribosomal ITS sequences

1Jun WEN*, 2Scott T. BERGGREN, 3Chung-Hee LEE, 4Stefanie ICKERT-BOND, 5Ting-Shuang YI, 6Ki-Oug YOO, 7Lei XIE, 8Joey SHAW, 9Dan POTTER

1(Department of Botany, National Museum of Natural History, MRC 166, Smithsonian Institution, Washington, DC 20013-7012, USA)
2(Department of Biology, Colorado State University, Fort Collins, CO 80523, USA)
3(Korean National Arboretum, 51-7 Jikdongni Soheur-eup Pocheon-si Gyeonggi-do, 487-821, Korea)
4(UA Museum of the North and Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, AK 99775-6960, USA)
5(Key Laboratory of Plant Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China)
6(Division of Life Sciences, Kangwon National University, Chuncheon 200-701, Korea)
7(State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China)
8(Department of Biological and Environmental Sciences, University of Tennessee, Chattanooga, TN 37403-2598, USA)
9(Department of Plant Sciences, MS 2, University of California, Davis, CA 95616, USA)wenj@si.edu

Keywords: ITS;ndhF;phylogeny;Prunus;Rosaceae

Abstract:

Sequences of the chloroplast ndhF gene and the nuclear ribosomal ITS regions are employed to reconstruct the phylogeny of Prunus (Rosaceae), and evaluate the classification schemes of this genus. The two data sets are congruent in that the genera Prunus s.l. and Maddenia form a monophyletic group, with Maddenia nested within Prunus. However, the ndhF data set is incongruent with the ITS data supporting two major groups within Prunus: one consisting of subgenera Laurocerasus (including Pygeum) and Padus as well as the genus Maddenia and another of subgenera Amygdalus, Cerasus, and Prunus. The ITS data, on the other hand, support a clade com-posed of subgenera Amygdalus and Prunus and Prunus sect. Microcerasus in addition to a paraphyletic grade of subgenera Laurocerasus and Padus (and the genus Maddenia) taxa. In general, the subgeneric classifications of Prunus s.l. are not supported. The ITS and ndhF phylogenies differ mainly in interspecific relationships and the relative position of the Padus/Laurocerasus group. Both ITS and ndhF data sets suggest that the formerly recog-nized genus Pygeum is polyphyletic and that the distinction of the subgenera Padus and Laurocerasus is not supported. The biogeographic interactions of the temperate and tropical members in the Padus/Laurocera- sus/Maddenia alliance including Pygeum are shown to be highly dynamic and complex.

 

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