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University of Western Australia (2020)

Marri (Corymbia calophylla) tree mortality in Western Australia : Interactive effects of drought and a canker pathogen (Quambalaria coyrecup)

Hossain Mohitul

Titre : Marri (Corymbia calophylla) tree mortality in Western Australia : Interactive effects of drought and a canker pathogen (Quambalaria coyrecup)

Auteur : Hossain Mohitul

Université de soutenance : University of Western Australia

Grade : Doctor of Philosophy (PhD) 2020

Résumé
Tree mortality in eucalypt-dominated forest ecosystems in Australia is thought to be associated with climatic extremes and shifts in pest and pathogen dynamics. Marri (Corymbia calophylla) decline in Western Australia is primarily caused by canker disease (Quambalaria coyrecup). This project shows that drought stress influences host-pathogen interactions, with different susceptibility among host provenances. Pathogen-induced dysfunctionality of phloem and xylem aggravates the negative impact of drought induced-xylem embolism under simultaneous disease and drought stress, leading to the death of branches, and eventually, in extreme cases, to the death of the whole tree.

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Page publiée le 25 janvier 2021