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A latitudinal cline in disease resistance of a host tree


Hamilton, MG and Williams, DR and Tilyard, PA and Pinkard, EA and Wardlaw, TJ and Glen, M and Vaillancourt, RE and Potts, BM, A latitudinal cline in disease resistance of a host tree, Heredity, 110, (4) pp. 372-379. ISSN 0018-067X (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Macmillan Publishers Limited

DOI: doi:10.1038/hdy.2012.106


The possible drivers and implications of an observed latitudinal cline in disease resistance of a host tree were examined. Mycosphaerella leaf disease (MLD) damage, caused by Teratosphaeria species, was assessed in five Eucalyptus globulus (Tasmanian blue gum) common garden trials containing open-pollinated progeny from 13 native-forest populations. Significant population and family within population variation in MLD resistance was detected, which was relatively stable across different combinations of trial sites, ages, seasons and epidemics. A distinct genetic-based latitudinal cline in MLD damage among host populations was evident. Two lines of evidence argue that the observed genetic-based latitudinal trend was the result of direct pathogen-imposed selection for MLD resistance. First, MLD damage was positively associated with temperature and negatively associated with a prediction of disease risk in the native environment of these populations; and, second, the quantitative inbreeding coefficient (QST) significantly exceeded neutral marker FST at the trial that exhibited the greatest MLD damage, suggesting that diversifying selection contributed to differentiation in MLD resistance among populations. This study highlights the potential for spatial variation in pathogen risk to drive adaptive differentiation across the geographic range of a foundation host tree species.

Item Details

Item Type:Refereed Article
Keywords:eucalypt, Teratosphaeria, genetic
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Genetics not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Hamilton, MG (Dr Matthew Hamilton)
UTAS Author:Tilyard, PA (Mr Paul Tilyard)
UTAS Author:Glen, M (Dr Morag Glen)
UTAS Author:Vaillancourt, RE (Professor Rene Vaillancourt)
UTAS Author:Potts, BM (Professor Brad Potts)
ID Code:84406
Year Published:2013
Web of Science® Times Cited:40
Deposited By:Plant Science
Deposited On:2013-05-14
Last Modified:2018-03-28

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