Microsatellite diversity and genetic structure of the commercially important tropical tree species <Emphasis Type="Italic">Eucalyptus urophylla</Emphasis>, endemic to seven islands in eastern Indonesia |
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Authors: | Kitt G Payn William S Dvorak Bernard J H Janse Alexander A Myburg |
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Institution: | (1) Camcore, North Carolina State University, P.O. Box 7626, Raleigh, NC 27695, USA;(2) Mondi Business Paper South Africa, P.O. Box 31024, Merebank, 4059, South Africa;(3) Forest Molecular Genetics Programme, Department of Genetics, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa |
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Abstract: | Eucalyptus urophylla (Timor mountain gum) is an economically important plantation species that occurs naturally in a series of disjunct populations
on the volcanic slopes of seven islands in eastern Indonesia. Twelve microsatellite markers were used to investigate the distribution
of nuclear genetic diversity among 19 geographically defined E. urophylla populations. High levels of gene diversity were observed throughout the geographic range (H
E = 0.703 to 0.776). The level of genetic differentiation among populations was low (F
ST = 0.031), but the amount of differentiation increased with geographic distance. A phenogram produced by a neighbor-joining
analysis illustrated that populations clustered according to islands. However, a Bayesian clustering approach revealed a more
cryptic population structure comprising two genetically homogeneous groups. Gene flow among the populations is likely responsible
for the apparent weak influence of geographic insularity on the genetic diversity and structure of the island species. These
findings provide direction for conservation and breeding strategies in E. urophylla.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | SSR Breeding Conservation Eucalypt |
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