Changes in leaf chemistry and anatomy of Corymbia citriodora subsp. variegata (Myrtaceae) in response to native and exotic pathogens

Flávia Sarti Bonora; Helen F Nahrung; Richard Andrew Hayes; Tanya Scharaschkin; Geoff Pegg; David John Lee

doi:10.1007/s13313-020-00739-z

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Changes in leaf chemistry and anatomy of Corymbia citriodora subsp. variegata (Myrtaceae) in response to native and exotic pathogens

Journal article

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Changes in leaf chemistry and anatomy of Corymbia citriodora subsp. variegata (Myrtaceae) in response to native and exotic pathogens

Flávia Sarti Bonora, Helen F Nahrung, Richard Andrew Hayes, Tanya Scharaschkin, Geoff Pegg and David John Lee

Australasian Plant Pathology, Vol.49(6), pp.641-653

2020

DOI: https://doi.org/10.1007/s13313-020-00739-z

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Abstract

Corymbia citriodora subsp. variegata (CCV) is an economically and ecologically important timber species, native to eastern Australia. It is highly susceptible to Quambalaria pitereka, a coevolved endemic pathogen, and Austropuccinia psidii, an exotic invasive pathogen. Genes associated with resistance to Q. pitereka are specific and uncorrelated with the genes associated with resistance to A. psidii, suggesting different resistance mechanisms to each pathogen, possibly associated with leaf phenotypic traits. This study examined leaf chemical and anatomical differences in CCV between uninoculated plants and those inoculated with Q. pitereka and A. psidii. The results demonstrate that the pathogens induce different responses in CCV. Plants inoculated with A. psidii exhibited chemical and anatomical changes that were not observed in uninoculated controls and Q. pitereka-inoculated plants, such as deposition of polyphenols and tannins in upper/lower epidermis, variation in the proportion of monoterpenes, steroids, monounsaturated hydrocarbons and long chain hydrocarbons and higher leaf toughness. In contrast, CCV response to Q. pitereka altered the distribution of polyphenols and tannins in the leaves and possible accumulation of these compounds and lignin in necrotic areas. These findings provide a better understanding of factors underlying CCV responses to coevolved and exotic pathogens and add insights into plant-pathogen interactions.

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Title: Changes in leaf chemistry and anatomy of Corymbia citriodora subsp. variegata (Myrtaceae) in response to native and exotic pathogens
Authors: Flávia Sarti Bonora (Corresponding Author) - University of the Sunshine Coast, Queensland, Faculty of Arts, Business and Law
Helen F Nahrung (Author) - University of the Sunshine Coast, Queensland, Forest Industries Research Centre
Richard Andrew Hayes (Author) - University of the Sunshine Coast, Queensland, Forest Industries Research Centre
Tanya Scharaschkin (Author) - Botanical Research Art and Training (Australia)
Geoff Pegg (Author) - Queensland Department of Agriculture and Fisheries
David John Lee (Author) - University of the Sunshine Coast, Queensland, Forest Industries Research Centre
Publication details: Australasian Plant Pathology, Vol.49(6), pp.641-653
Publisher: Springer Netherlands
DOI: 10.1007/s13313-020-00739-z
ISSN: 1448-6032
Organisation Unit: Forest Research Institute; Faculty of Arts, Business and Law; Faculty of Science, Health, Education and Engineering; University of the Sunshine Coast, Queensland; Forest Industries Research Centre; Tropical Forests & People Research Centre; USC Business School - Legacy
Language: English
Record Identifier: 99482301702621
Output Type: Journal article

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