Abstract
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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Selected References
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