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Independent QTL underlie resistance to the native pathogen Quambalaria pitereka and the exotic pathogen Austropuccinia psidii in Corymbia


Butler, JB and Potts, BM and Vaillancourt, RE and Lee, DJ and Pegg, GS and Freeman, JS, Independent QTL underlie resistance to the native pathogen Quambalaria pitereka and the exotic pathogen Austropuccinia psidii in Corymbia, Tree Genetics and Genomes, 15 Article 72. ISSN 1614-2942 (2019) [Refereed Article]

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Copyright 2019 Springer-Verlag GmbH Germany, part of Springer Nature

DOI: doi:10.1007/s11295-019-1378-x


Fungal diseases such as the exotic myrtle rust (Austropuccinia psidii), and the native Quambalaria shoot blight (QSB; caused by Quambalaria species including Q. pitereka), constitute a significant threat to both native forests and Corymbia plantations in Australia and overseas. We here use quantitative trait loci (QTL) analysis to understand the genetic architecture of resistance to these pathogens in C. torelliana and C. citriodora subsp. variegata. QTL analysis was undertaken using 360 genotypes from two F1 crosses of C. torelliana × C. citriodora subsp. variegata, phenotyped by controlled inoculation with the strain of A. psidii present in Australia and independent inoculations with two strains of Q. pitereka (QSB1 & QSB2). A total of 22 QTL were identified, six for rust and 16 for QSB. The QTL for resistance to A. psidii and Q. pitereka in these pedigrees were independent from one another since they were generally in different parts of the genome, with only one case of co-location (QTL peak location within ± 2 MB). The QTL for the different QSB strains all mapped to discrete locations. The QTL for QSB were generally of a greater effect size than those for A. psidii. Several co-locations with QTL for resistance to rust and other fungal pathogens found in another eucalypt, Eucalyptus globulus, were detected and the implications of this observation are discussed.

Item Details

Item Type:Refereed Article
Keywords:QTL, Corymbia, eucalypt, myrtle rust, Quambalaria shoot blight, Austropuccinia psidii, disease resistance, genetics
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Gene mapping
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Butler, JB (Dr Jakob Butler)
UTAS Author:Potts, BM (Professor Brad Potts)
UTAS Author:Vaillancourt, RE (Professor Rene Vaillancourt)
UTAS Author:Freeman, JS (Dr Jules Freeman)
ID Code:135412
Year Published:2019
Funding Support:Australian Research Council (DP140102552)
Web of Science® Times Cited:7
Deposited By:Plant Science
Deposited On:2019-10-17
Last Modified:2019-11-07

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