Population genetic structuring in a rare tropical plant: Idiospermum australiense (Diels) S.T. Blake

Jones, Lynne M., Gadek, Paul A., and Harrington, Mark G. (2010) Population genetic structuring in a rare tropical plant: Idiospermum australiense (Diels) S.T. Blake. Plant Systematics and Evolution, 286 (3-4). pp. 133-139.

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Idiospermum australiense (Diels) S.T. Blake is considered to be one of the few remaining species of an ancient assemblage to have survived the attrition ofAustralian tropical rain forest during historically drier periods. This monotypic species is currently restricted to two very wet lowland rain forest locations in Australia’s wet tropical World Heritage Area that are thought to have provided refuge for humid-adapted taxa during the last glacial maximum. Two dominant (RAPD and ISSR) molecular marker sets were employed to investigate whether the genetic structure of Idiospermum could be attributed to its restriction to these quite disjunct localities. The results reveal that neither its restriction to purported Pleistocene refugia nor the geographic distance between populations could fully explain the distribution of variation in the Idiospermum data set, with evidence to suggest that potentially deeper time events have played a role in population structuring and the distribution of diversity. Although there is sufficient evidence in the data to suggest that gene dispersal is quite limited in the species, further investigation is still needed to yield more informative detail on additional factors, such as breeding and germination strategies and their potential influence over population structuring and diversity levels within each population and refugium.

Item ID: 16031
Item Type: Article (Research - C1)
ISSN: 1615-6110
Keywords: Idiospermum, RAPD, ISSR, population structure, lowland tropical rain forests
Date Deposited: 21 Apr 2011 06:56
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060399 Evolutionary Biology not elsewhere classified @ 70%
06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060302 Biogeography and Phylogeography @ 30%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 50%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
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