Ref ID: 11312
Ref Type: Journal
Authors: Jones, M. E., Shepherd, M., Henry, R. J., and Delves, A.
Pub Date: 2006
Journal Name: Conservation Genetics
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Issue:
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Keywords: analysis/Australia/chloroplast/chloroplast DNA/conservation/continuous/data/differentiation/dispersal/distribution/DNA/eucalypt/eucalypts/Eucalyptus/Eucalyptus grandis/Eucalyptus,grandis/evolution/forest/forest tree/genetic/genome/isozyme/locus/management/Myrtaceae,forest tree,JLA,phylogeography/nuclear/plant/population/population structure/potential/Queensland,New South Wales/region/seed/significance/species/strategy/structure/study/subtropical/tree/variation
Abstract: Recognition of genetic structure of populations and the ability to identify vulnerable populations is useful for the formation of conservation management strategies for plants. Eucalyptus grandis is a tall forest tree that has a wide, largely continuous distribution in subtropical and tropical eastern Australia. Many widespread forest species exhibit population differentiation that corresponds to geographic regions. However, Eucalyptus grandis appears to be an exception based on isozyme and morphological data. This is intriguing given a large discontinuity between northern populations and those in the southern part of the species range. In this study, the distribution of a maternally inherited chloroplast locus was examined as it was more likely to reveal genetic structure due to the slower evolution of the chloroplast genome and limited dispersal of seed in eucalypts. As expected, the GST for chloroplast DNA was higher than that for nuclear DNA but indicated low population differentiation for a forest tree species. Phylogeographic analysis indicated the 15 populations grouped into three broad geographical regions; however, overall population structure was weak suggesting that the large geographical disjunction in the distribution of E. grandis may be relatively recent. Analysis of a haplotype gene-tree identified putatively ancestral haplotypes of potential evolutionary significance, some with restricted distributions. A paradigm for conservation management of E. grandis based on chloroplast DNA haplotype distribution would account for the low differentiation between populations but consider unique and potentially rare ancestral haplotypes.
Notes: Entered by Mervyn Shepherd (29/11/2005)
Reprint: Not in File
Program: SPF Genetic Improvement
Project: A7
Deliverable:
Confidentiality: Public
Availability: Authors
Report: Annual Report 2005/6
Type: Article
Address: mshepher@scu.edu.au
Misc 2: Published