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Parallel evolution of dwarf ecotypes in the forest tree Eucalyptus globulus

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Foster, SA and McKinnon, GE and Steane, DA and Potts, BM and Vaillancourt, RE (2007) Parallel evolution of dwarf ecotypes in the forest tree Eucalyptus globulus. New Phytologist, 175 (2). pp. 370-380. ISSN 0028-646X

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Abstract

Three small populations of a dwarf ecotype of the forest tree
Eucalyptus globulus
are found on exposed granite headlands in south-eastern Australia. These populations
are separated by at least 100 km.
Here, we used 12 nuclear microsatellites and a chloroplast DNA marker to investigate
the genetic affinities of the dwarf populations to one another and to their
nearest populations of tall
E.
globulus
Cape Tourville was studied in greater detail
to assess the processes enabling the maintenance of distinct ecotypes in close
geographical proximity.
The three dwarf populations were not related to one another and were more
closely related to adjacent tall trees than to one another. At Cape Tourville the dwarf
and tall ecotypes were significantly differentiated in microsatellites and in chloroplast
DNA. The dwarf and tall populations differed in flowering time and no evidence of
pollen dispersal from the more extensive tall to the dwarf population was found.
The three dwarf populations have evolved in parallel from the local tall ecotypes.
This study shows that small marginal populations of eucalypts are capable of
developing reproductive isolation from nearby larger populations through differences
in flowering time and/or minor spatial separation, making parapatric speciation
possible.

Item Type: Article
Keywords: ecological speciation, ecotypic variation, eucalypt genetics, Eucalyptus globulus , flowering time, gene flow, parallel evolution, parapatric speciation.
Journal or Publication Title: New Phytologist
Page Range: pp. 370-380
ISSN: 0028-646X
Identification Number - DOI: 10.1111/j.1469-8137.2007.02077.x
Additional Information:

BM Potts. The definitive version is available at www.blackwell-synergy.com

Date Deposited: 02 Mar 2008 22:21
Last Modified: 18 Nov 2014 03:30
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