Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

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

Duong, H.T.ORCID: 0000-0001-6183-6141, Pegg, G.S., Mazanec, R., McComb, J.A., Burgess, T.ORCID: 0000-0002-7962-219X and Hardy, G.E.St.J. (2022) Resistance to quambalaria shoot blight and myrtle rust in Corymbia calophylla seedlings. Forest Pathology, 52 (5). Art. e12775.

PDF - Published Version
Download (1MB) | Preview
Free to read:
*No subscription required


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: Journal Article
Murdoch Affiliation(s): Centre for Terrestrial Ecosystem Science and Sustainability
Publisher: Blackwell Publishing
Copyright: © 2022 The Authors.
Item Control Page Item Control Page


Downloads per month over past year