A cline in genetic diversity in river she-oak Casuarina cunninghamiana [Australia]
1989
Moran, G.F. | Bell, J.C. | Turnbull, J.W. (Commonwealth Scientific and Industrial Research Organization, Canberra (Australia). Div. of Forestry and Forest Products)
Twenty populations of Casuarina cunninghamiana Miq. covering its large geographic range in eastern and northern Australia were used in a study of genetic diversity. Genetic variation was measured by analysing 19 allozyme loci using 50 seedlings from each of the populations. The overall genetic diversity is high compared to many other plant species. A significant fraction (26.4 percent) of the total genetic diversity could be apportioned among populations. Populations in the eastern part of the range had a high correlation of genetic diversity with latitude. At the population level, there was a significant positive correlation between genetic diversity and 1 year height growth. The western population from King River in the Northern Territory was very distinct genetically from all the other populations and this supported previous suggestions that the north-west part of the range is occupied by a different race of the species.
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