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Host responses to natural infection by Cytonaema sp. in the aerial bark of Eucalyptus globulus by A. Eyles; N. W. Davies; Z. Q. Yuan; C. Mohammed is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Summary The chemical and anatomical host responses to natural fungal infection by __Cytonaema__ sp. in the aerial bark of 3‐year‐old __Eucalyptus globulus__ plantation trees were examined. The lesion margin (LM) of the canker‐infected bark was characterized by the formation of a layer of dark extractives visible to the naked eye. Chemical analysis of the LM by gas chromatography‐mass spectrometry (GC‐MS), high‐performance liquid chromatography (HPLC) with ultraviolet detection and HPLC‐MS using negative ion electrospray ionisation indicated the presence of a range of compounds including hydrolysable tannins, polymeric proanthocyanidins, flavonoid glycosides, formlyated phloroglucinol compounds and volatile terpenes. These compounds were either undetectable in healthy tissue or present at significantly lower concentrations than in the LM. The LM of the canker‐infected bark was morphologically distinct from healthy phloem, its characteristics varying depending on severity of canker infection. In superficial infections in which only the phloem was affected, the following LMs were observed: (i) a continuous wound periderm of multiple layers, or (ii) an incompletely differentiated an

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Author

A. Eyles; N. W. Davies; Z. Q. Yuan; C. Mohammed

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 1437-4781)

Published

2003

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)