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

Citation

Butler, JB and Freeman, JS and Vaillancourt, RE and Potts, BM and Glen, M and Lee, DJ and Pegg, GS, Evidence for different QTL underlying the immune and hypersensitive responses of Eucalyptus globulus to the rust pathogen Puccinia psidii, Tree Genetics and Genomes, 12, (3) Article 39. ISSN 1614-2942 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Springer Verlag

DOI: doi:10.1007/s11295-016-0987-x

Abstract

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.

Item Details

Item Type:Refereed Article
Keywords:myrtle rust, guava rust, Puccinia psidii, disease resistance, QTL Eucalyptus globulus, naiive host
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Population, Ecological and Evolutionary Genetics
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Native Forests
Author:Butler, JB (Mr Jakob Butler)
Author:Freeman, JS (Dr Jules Freeman)
Author:Vaillancourt, RE (Professor Rene Vaillancourt)
Author:Potts, BM (Professor Brad Potts)
Author:Glen, M (Dr Morag Glen)
ID Code:110794
Year Published:2016
Deposited By:Plant Science
Deposited On:2016-08-15
Last Modified:2017-11-03
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