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Genetics, Vol 123, 557-565, Copyright © 1989
INVESTIGATIONS |
Genetic Analysis of an Interspecific Hybrid Swarm of Populus: Occurrence of Unidirectional Introgression
P. Keim, K. N. Paige, T. G. Whitham and K. G. Lark
Department of Biology, University of Utah, Salt Lake City, Utah 84112 Current address: Department of Biology, Northern Arizona State University, Flagstaff, Arizona 86011.
Restriction fragment length polymorphisms were used to distinguish genotypes of two species of Populus, P. fremontii (`Fremont') and P. angustifolia (`narrowleaf'). Both inter- and intraspecific polymorphisms were detected in these cottonwood trees. The interspecific variation was much greater than the intraspecific variation. This permitted identification of parental genotypes within individual trees of a hybrid swarm which exists in an overlap zone between the two species. Within this hybrid swarm, individual trees are either F(1) hybrids or backcrosses with a pure `narrowleaf' parent; no progeny were found that could be attributed to crossing between F(1) hybrid trees, or to backcrossing between F(1) hybrid trees and `Fremont'.
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