Evidence for different QTL underlying the immune and hypersensitive responses of Eucalyptus globulus to the rust pathogen Puccinia psidii

J B Butler; Jules S Freeman; R E Vaillancourt; Brad M Potts; M Glen; David J Lee; Geoff S Pegg

doi:10.1007/s11295-016-0987-x

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Evidence for different QTL underlying the immune and hypersensitive responses of Eucalyptus globulus to the rust pathogen Puccinia psidii

Journal article

Peer reviewed

Evidence for different QTL underlying the immune and hypersensitive responses of Eucalyptus globulus to the rust pathogen Puccinia psidii

J B Butler, Jules S Freeman, R E Vaillancourt, Brad M Potts, M Glen, David J Lee and Geoff S Pegg

Tree Genetics & Genomes, Vol.12(39), pp.1-13

2016

DOI: https://doi.org/10.1007/s11295-016-0987-x

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Abstract

myrtle rust

guava rust

puccinia psidii

disease resistance

QTL

eucalyptus globulus

naÃ¯ve host

The rust Puccinia psidii infects many species in the family Myrtaceae. Native to South America, the pathogen has recently entered Australia which has a rich Myrtaceous flora, including trees of the ecologically and economically important genus Eucalyptus. We studied the genetic basis of variation in rust resistance in Eucalyptus globulus, the main plantation eucalypt in Australia. Quantitative trait loci (QTL) analysis was undertaken using 218 genotypes of an outcross F2 mapping family, phenotyped by controlled inoculation of their open pollinated progeny with the strain of P. psidii found in Australia. QTL analyses were conducted using a binary classification of individuals with no symptoms (immune) versus those with disease symptoms, and in a separate analysis dividing plants with disease symptoms into those exhibiting the hypersensitive response versus those with more severe symptoms. Four QTL were identified, two influencing whether a plant exhibited symptoms (Ppr2 and Ppr3), and two influencing the presence or absence of a hypersensitive reaction (Ppr4 and Ppr5). These QTL mapped to four different linkage groups, none of which overlap with Ppr1, the major QTL previously identified for rust resistance in Eucalyptus grandis. Candidate genes within the QTL regions are presented and possible mechanisms discussed. Together with past findings, our results suggest that P. psidii resistance in eucalypts is quantitative in nature and influenced by the complex interaction of multiple loci of variable effect.

Details

Title: Evidence for different QTL underlying the immune and hypersensitive responses of Eucalyptus globulus to the rust pathogen Puccinia psidii
Authors: J B Butler (Author) - University of Tasmania
Jules S Freeman (Author) - University of Tasmania
R E Vaillancourt (Author) - University of Tasmania
Brad M Potts (Author) - University of the Sunshine Coast - Faculty of Arts, Business and Law
M Glen (Author) - University of Tasmania
David J Lee (Author) - University of the Sunshine Coast - Faculty of Arts, Business and Law
Geoff S Pegg (Author) - Department of Agriculture, Fisheries and Forestry
Publication details: Tree Genetics & Genomes, Vol.12(39), pp.1-13
Publisher: Springer
Date published: 2016
DOI: 10.1007/s11295-016-0987-x
ISSN: 1614-2942
Organisation Unit: Tropical Forests and People Research Centre; University of the Sunshine Coast, Queensland; Forest Industries Research Centre; Forest Research Institute
Language: English
Record Identifier: 99449216302621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Forestry; Genetics & Heredity; Horticulture

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