A morphological cline in Eucalyptus: a genetic perspective

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Title A morphological cline in Eucalyptus: a genetic perspective
Author Holman, James; Hughes, Jane; Fensham, Rod J.
Journal Name Molecular Ecology
Editor Harry Smith, Loren Rieseberg
Year Published 2003
Place of publication United Kingdom
Publisher Blackwell Publishing Ltd.
Abstract The putative hybrid zone between Eucalyptus populnea and E. brownii is examined using morphological and molecular techniques. This species complex displays continuous morphological variation across the study area, which has been previously interpreted as the product of hybridization between allopatric species. A microsatellite analysis indicates that there was little genetic structuring across the morphological cline and only low levels of population differentiation. The nested clade analysis of the JLA+ region of the chloroplast DNA (cpDNA) indicates that the geographical distribution of cpDNA haplotypes is unlikely to be the result of historical hybridization events, and that restricted seed-mediated gene flow with isolation by distance is responsible for the phylogeographical distribution. A more plausible explanation for the origin and persistence of the morphological cline is that the process of continuous morphological diversification has been promoted by a directional selection gradient. This study addresses species status within Eucalyptus and the belief that hybridization is widespread and is an important process in the group's evolution.
Peer Reviewed Yes
Published Yes
Publisher URI http://www3.interscience.wiley.com/journal/117989598/home
Alternative URI http://dx.doi.org/10.1046/j.1365-294X.2003.01970.x
Volume 12
Edition 2003
Page from 3013
Page to 3025
ISSN 0962-1083
Date Accessioned 2004-03-25
Language en_AU
Research Centre Australian Rivers Institute
Faculty Faculty of Environmental Sciences
Subject PRE2009-Ecology and Evolution
URI http://hdl.handle.net/10072/6061
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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