Few Mendelian Genes Underlie the Quantitative Response of a Forest Tree, Eucalyptus globulus, to a Natural Fungal Epidemic

Jules S Freeman; Brad M Potts; R E Vaillancourt

doi:10.1534/genetics.107.081414

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Few Mendelian Genes Underlie the Quantitative Response of a Forest Tree, Eucalyptus globulus, to a Natural Fungal Epidemic

Journal article

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Few Mendelian Genes Underlie the Quantitative Response of a Forest Tree, Eucalyptus globulus, to a Natural Fungal Epidemic

Jules S Freeman, Brad M Potts and R E Vaillancourt

Genetics, Vol.178(1), pp.563-571

2008

DOI: https://doi.org/10.1534/genetics.107.081414

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Abstract

Genetics

community genetics

Eucalyptus globulus

herbivory

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.

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Title: Few Mendelian Genes Underlie the Quantitative Response of a Forest Tree, Eucalyptus globulus, to a Natural Fungal Epidemic
Authors: Jules S Freeman (Author) - University of Tasmania
Brad M Potts (Author) - University of Tasmania
R E Vaillancourt (Author) - University of Tasmania
Publication details: Genetics, Vol.178(1), pp.563-571
Publisher: Genetics Society of America
Date published: 2008
DOI: 10.1534/genetics.107.081414
ISSN: 0016-6731
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450145402621
Output Type: Journal article

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