Systematics Section / ASPT
Shaw, Joey , Wen, Jun , Haberle, Rosemarie , Chin, Siew Wai , Potter, Daniel .
Chloroplast DNA phylogeny of Prunus L. (Rosaceae) using trnS-trnG-trnG and trnL-trnL-trnF DNA Sequences.
Prunus L. (Rosaceae), comprising roughly 200 species of trees and shrubs, includes several of the most economically important fruit and nut crop species of temperate regions, such as plums/prunes, peaches, cherries, and almonds, as well as many ornamental species and numerous wild species of ethnobotanical importance because of their uses for food, timber, and medicine. Prunus is distributed throughout the north temperate regions of the world and also includes representatives in tropical regions of Asia and America. Species of Prunus exhibit a diversity of morphologies of vegetative and reproductive structures, some of which (e.g., inflorescence type) have been emphasized in previous classifications, while others (e.g., the position and morphology of the often striking glands present on the leaves) have received surprisingly little attention. Earlier workers divided the genus into five or six subgenera and seven to nine sections that are still largely recognized today. However, several recent DNA sequence-based studies, all of which were based on fewer than about 25% of the species in the genus, have suggested that many infrageneric taxa are not monophyletic. Moreover, species delimitation throughout Prunus is notoriously poorly understood, and none of the aforementioned studies has included adequate representation of the Pygeum group, i.e., section Mesopygeum (subgenus Laurocerasus), a group of about 40 species of the Old World tropics, formerly treated as a separate genus but now generally included within Prunus. These recent molecular phylogenetic analyses have elucidated various aspects of Prunus systematics, but many questions about the status of infrageneric taxa, character evolution, and historical biogeography across the genus remain unresolved. We have now generated trnS-trnG-trnG and trnL-trnL-trnF sequences from the majority of the commonly recognized species in the genus; so, here we present the most thoroughly sampled chloroplast DNA phylogeny of Prunus.
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1 - University of Tennessee, Chattanooga, Department of Biological and Environmental Sciences, 215 Holt Hall, Department 2653, 615 McCallie Avenue, Chattanooga, Tennessee, 37403, USA
2 - Smithsonian Institution, Department of Botany MRC 166, National Museum Of Natural History, Po Box 37012, Washington, DC, 20560-0166, USA
3 - University of California, Davis, Pomology, One Shields Ave., Davis, California, 95616, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 3/Hilton
Date: Wednesday, July 11th, 2007
Time: 8:30 AM