Genetic analysis of an interspecific hybrid swarm of Populus: occurrence of unidirectional introgression - PubMed (original) (raw)
Genetic analysis of an interspecific hybrid swarm of Populus: occurrence of unidirectional introgression
P Keim et al. Genetics. 1989 Nov.
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 F1 hybrids or backcrosses with a pure 'narrowleaf' parent; no progeny were found that could be attributed to crossing between F1 hybrid trees, or to backcrossing between F1 hybrid trees and 'Fremont'.
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