Systematics Section / ASPT
Haberle, Rosemarie , Shaw, Joey , Chin, Siew Wai , Potter, Daniel , Wen, Jun .
Phylogeny of Prunus L. (Rosaceae) using nrITS and the low-copy nuclear marker gbssI-2.
Prunus L. (Rosaceae) is a large and economically important genus with over 200 species of trees and shrubs chiefly of temperate regions, but also including representatives in tropical regions of America, Asia and Africa. Historically, the genus has been divided into five or six subgenera and seven to nine sections. Members of subgenus Laurocerasus (laurel-cherries) are disjunctly distributed in the Old World (temperate and tropical) and New World tropics. This includes the Pygeum group of about 40 species of the Old World tropics which was formerly treated as a separate genus but now generally included within subgenus Laurocerasus as section Mesopygeum. Several recent DNA sequence-based phylogenetic studies have indicated that many infrageneric taxa are not monophyletic. One recent phylogenetic study has shown that several vegetative and floral characters traditionally used to circumscribe taxa within the genus are non-informative. All of these previous studies were limited in resolution and sampling. We have substantially expanded sampling of tropical American, African and Asian taxa as well as previously unsampled taxa from temperate regions. Phylogenetic relationships of all recognized subgenera and sections were analyzed using nuclear ITS and gbssI-2 coding and non-coding regions. These markers were analyzed individually and as combined data using parsimony and Bayesian approaches. Preliminary data support the previous hypotheses that the historical delineations with the genus are not monophyletic and suggest a more robust phylogenetic framework for future re-circumscription of the infrageneric taxa of Prunus. These results also provide further clues into the historical biogeography of the genus. This has provided better resolution of relationships at both subgeneric and sectional levels and better-supported placement of individual taxa within the genus.
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1 - University of California, Davis, Department of Plant Sciences, Mail Stop 2, One Shields Avenue, Davis, CA, 95616, USA
2 - University of Tennessee, Chattanooga, Department of Biological and Environmental Sciences, 215 Holt Hall, Department 2653, 615 McCallie Avenue, Chattanooga, Tennessee, 37403, USA
3 - Smithsonian Institution, Department of Botany MRC 166, National Museum Of Natural History, Po Box 37012, Washington, DC, 20560-0166, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 3/Hilton
Date: Wednesday, July 11th, 2007
Time: 8:45 AM