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Resistance to quambalaria shoot blight and myrtle rust in Corymbia calophylla seedlings

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Duong, H. T., Pegg, G. S., Mazanec, R., McComb, J. A., Burgess, T. and Hardy, G. E. S. J. (2022) Resistance to quambalaria shoot blight and myrtle rust in Corymbia calophylla seedlings. Forest Pathology, 52 (5). e12775. ISSN 1437-4781


Article Link: https://doi.org/10.1111/efp.12775

Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/efp.12775


Abstract Corymbia calophylla (marri), an endemic keystone tree species in southwest Western Australia, is increasingly impacted by the introduced basidiomycete smut Quambalaria pitereka. The basidiomycete rust Austropuccinia psidii (myrtle rust), an invasive pathogen recently introduced to Eastern Australia, is expected to spread to the southwest of Western Australia eventually. Austropuccinia psidii has similar epidemiology to Q. pitereka, and there is concern that C. calophylla may be susceptible. Preliminary pathogenicity tests showed significant differences in aggressiveness between twelve Q. pitereka isolates, and there was evidence of interactions between isolates and C. calophylla provenances. Seedlings from 59 open-pollinated families from 11 provenances covering the natural range of marri were screened for resistance to Q. pitereka and A. psidii under controlled glasshouse conditions. Resistance of seedlings within provenances to Q. pitereka and A. psidii differed significantly. There was no significant correlation between resistance to Q. pitereka and resistance to A. psidii. Seedlings of provenances from wetter regions were more resistant to both pathogens, but the correlation coefficients were insignificant. Seedlings of four families in three provenances (Serpentine, Chidlow, and Kingston) showed 100% resistance to Q. pitereka. Narrow-sense heritability estimates were 0.07 for quambalaria shoot blight resistance and 0.34 for myrtle rust resistance. The results indicate the potential to use selected families/individuals resistant to Q. pitereka and A. psidii for tree improvement programs and adaptive management strategies.

Item Type:Article
Business groups:Horticulture and Forestry Science
Subjects:Plant pests and diseases
Forestry > Research. Experimentation
Live Archive:24 Nov 2022 23:46
Last Modified:24 Nov 2022 23:46

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