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. 1989 Nov;123(3):557-65.
doi: 10.1093/genetics/123.3.557.

Genetic analysis of an interspecific hybrid swarm of Populus: occurrence of unidirectional introgression

P Keim  1 , K N Paige, T G Whitham, K G Lark
Affiliations

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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