High genetic divergence between geographic regions in the highly outcrossing species Acacia aulacocarpa (Cunn. ex Benth.)
1997
McGranahan, M. | Slee, M. (Australian National Univ., Canberra (Australia). Department of Forestry) | Bell, J.C. | Moran, G.F.
The patterns of genetic variation and mating system in Acacia aulacocarpa were studied. The study of genetic variation analysed seedlings from 22 populations of A. aulacocarpa at 30 isozyme loci representing 19 enzyme systems. Cluster analysis revealed a subdivision of populations into five genetically distinct groups. Genetic distances between the five groups were high. The overall diversity (HT=0.298) was high compared to other Australian tree species with similar distributions. An exceptionally high proportion of this diversity (62.6%) was distributed between populations. However 86% of this interpopulation genetic diversity could be apportioned between the population groups which were largely geographically based. The study of the mating system in four populations of A. aulacocarpa at 10 isoyzme loci revealed a very high level of outcrossing (mean multilocus outcrossing rate =0.94) with little variation between populations
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