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Quantitative trait loci (QTLs) for intumescence severity in Eucalyptus globulus and validation of QTL detection based on phenotyping using open-pollinated families of a mapping population

journal contribution
posted on 2023-05-19, 20:47 authored by Hans Ammitzboll, Rene VaillancourtRene Vaillancourt, Bradley PottsBradley Potts, Singarasa, S, Mani, R, Jules FreemanJules Freeman
Intumescence is a nonpathogenic physiological disorder characterized by leaf blistering. This disorder can affect growth and development in glasshouses and growth chambers and may be confused with pathogenic diseases. We used quantitative trait loci (QTL) analysis to examine the genetic basis of variation in intumescence severity in Eucalyptus globulus, and test for colocation with previously detected QTLs for pathogen susceptibility. QTL analysis used the phenotype means of open-pollinated (OP) families of an outcrossed F2 mapping family (OP F3; n = 300) of E. globulus and the linkage map constructed in the F2. We validate this phenotyping approach for QTL analysis by assessing a trait previously used for QTL discovery in the F2 and showing the same major QTL was detected with the OP F3. For intumescence severity, five putative QTLs were detected across four linkage groups. Four of these did not colocate with previously reported QTLs for fungal pathogen susceptibility in Eucalyptus, suggesting the mechanisms underlying susceptibility to intumescence and to the two fungal pathogens are largely independent. This study demonstrates there is a genetic basis for variation in intumescence severity, reports the first QTL for intumescence severity in plants, and provides a robust framework for investigating the potential mechanisms involved.


Australian Research Council


Publication title

Plant Disease










School of Natural Sciences


Amer Phytopathological Soc

Place of publication

3340 Pilot Knob Road, St Paul, USA, Mn, 55121

Rights statement

© 2018 The American Phytopathological Society

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Hardwood plantations

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