Systematics Section / ASPT
Rohrer, Joseph R. .
Phylogenetic relationships among species of North American plums inferred from nuclear DNA sequences.
A century ago the eminent horticulturalist L. H. Bailey wrote that the taxonomy of the plums native to North America (Prunus sect. Prunocerasus, Rosaceae) was the “hardest puzzle in American pomology." In recent years several researchers using molecular data have sought to solve that puzzle. Our latest attempt to bring new insights into the relationships among our native plums uses two nuclear DNA sequences: the second intron of the homeotic gene LEAFY and exon 2 through exon 6 of the sorbital-6-phosphate dehydrogenase gene (s6pdh). As in previous studies, the lone species west of the Rocky Mountains, P. subcordata, is sister to the other American species. Data from both LEAFY and s6pdh support the sandy soil species (P. alleghaniensis, P. angustifolia, P. gracilis, P. maritima, P. texana, and P. umbellata) as a monophyletic group. LEAFY has a second clade sister to the sandy soil species with predominantly river bottom species. Based on the s6pdh data, however, the river bottom species form a paraphyletic group with a monophyletic clade of P. americana and P. mexicana. Both genes provide evidence of a hybrid origin for P. munsoniana and P. rivularis. Surprisingly P. murrayana from western Texas has LEAFY and s6pdh sequences nearly identical to those of P. hortulana of the central United States.
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1 - University of Wisconsin, Department Of Biology, Eau Claire, Wisconsin, 54702-4004, USA
native American plums.
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM