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Few mendelian genes underlie the quantitative response of a forest tree, Eucalyptus globulus, to a natural fungal epidemic

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Freeman, JS and Potts, BM and Vaillancourt, RE (2008) Few mendelian genes underlie the quantitative response of a forest tree, Eucalyptus globulus, to a natural fungal epidemic. Genetics, 178. pp. 563-571.

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Abstract

Foliar fungal pathogens from the genus Mycosphaerella affect eucalypts in natural forests and
plantations worldwide. QTL analysis was conducted to dissect the genetic control of resistance in Eucalyptus
globulus to a natural infection by Mycosphaerella leaf disease, using a clonally replicated outbred F2
family (112 genotypes) planted in a field trial. Two major QTL, with high LOD support (20.2 and 10.9)
and high genomewide significance, explained a large proportion (52%) of the phenotypic variance in the
severity of damage by Mycosphaerella cryptica, which may be indicative of oligogenic control. Both QTL were
validated in a second F2 family and one was validated in a third F2 family. The mean values of different
genotype classes at both major QTL argue for Mendelian inheritance with resistance dominant over
susceptibility. There were strong correlations between the levels of Mycosphaerella damage in related
genetic material planted in three widely separated locations in Tasmania. These findings together provide
evidence that the genes controlling resistance to Mycosphaerella damage are stable in different genetic
backgrounds and across different environments.

Item Type: Article
Journal or Publication Title: Genetics
Page Range: pp. 563-571
Identification Number - DOI: 10.1534/genetics.107.081414
Additional Information:

BM Potts.

Date Deposited: 12 Mar 2008 06:01
Last Modified: 18 Nov 2014 03:31
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