Schwarzbach, Andrea E. , Adams, Robert P. , Morris, Julie A. .
Northern hemisphere biogeography of Juniperus (Cupressaceae) using molecular and fossil information.
THE genus Juniperus comprises approximately 67 species and 28 varieties distributed in the northern hemisphere. However, one species, J. procera, grows along the rift mountains in East Africa. Phylogenetic relationships and biogeography of the genus Juniperus were studied using sequences of two DNA regions, trnC-D and ITS. A total of 97 taxa were analyzed using members of the genus Cupressus as outgroups. Maximum parsimony and Bayesian analyses identified six clearly distinguished clades that largely corresponded to previously recognized intrageneric groups. Those groups a re distinguished by the shape of the leaf margin, serrated or smooth, as well as the number of seeds per cone and whether stomatal bands are absent or present.
Distribution information was plotted onto the molecular tree. The results suggest an Old World origin and at least three migration events into North America from the Old World at different times during the history of the genus. We used fossil data for calibration of the phylogeny.
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1 - University of Texas, Biological Sciences, 80 Fort Brown
, Brownsville, Texas, 78520, USA
2 - Baylor University, Biology Department, P.O. Box 97388, Waco, Texas, 76798, USA
3 - Kent State University, Department of Biological Sciences, 256 Cunningham Hall, Kent, Ohio, 44242, USA
Presentation Type: Oral Paper:Papers for Topics
Location: 134/Performing Arts Center
Date: Wednesday, August 2nd, 2006
Time: 8:45 AM