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Effect of season and different fungi on phenolics in response to xylem wounding and inoculation in Eucalyptus nitens

Citation

Barry, KM and Davies, NW and Mohammed, CL, Effect of season and different fungi on phenolics in response to xylem wounding and inoculation in Eucalyptus nitens, Forest Pathology, 32, (3) pp. 163-178. ISSN 1437-4781 (2002) [Refereed Article]

DOI: doi:10.1046/j.1439-0329.2002.00281.x

Abstract

Pot-grown and plantation-grown Eucalyptus nitens trees (approximately 2 and 3 years old, respectively) were experimentally wounded and inoculated with different fungi and in different seasons. Decay lesion development and defence zones were assessed. Two zones were described, a narrow brown decay interface (interface reaction zone, IRZ) and a diffuse zone beyond this being either pale brown or purple (reaction zone, RZ). The total phenol levels in the reaction zone were determined. Selected phenolics (pedunculagin, tellimagrandin 1, tetragalloylglucose, pentagalloylglucose and catechin) were quantified by liquid chromatography-mass spectrometry (LC-MS). A range of fungi (mainly decay-causing) were used to inoculate wounds and the results indicated that more extensive decay lesions were generally associated with greater production of soluble phenols in response. Sterile inoculations and weakly aggressive fungi were associated with no or little xylem discoloration, whereas aggressive fungi elicited more discoloration and phenolic accumulation in advance of infection. This indicates that phenol accumulation is not a generalized response to wounding, but a variable response due to the interaction between microorganisms and sapwood. In plantation-grown trees examined 6 months after wounding, purple reaction zones were commonly associated with large decay lesions. Seasonal differences in decay column area caused by Ganoderma applanatum were not significant 1 month after wounding and inoculation.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Forestry Sciences
Research Field:Forestry Sciences not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Other Plant Production and Plant Primary Products
Objective Field:Plant Production and Plant Primary Products not elsewhere classified
Author:Barry, KM (Dr Karen Barry)
Author:Davies, NW (Associate Professor Noel Davies)
Author:Mohammed, CL (Associate Professor Caroline Mohammed)
ID Code:23718
Year Published:2002
Web of Science® Times Cited:18
Deposited By:Agricultural Science
Deposited On:2002-08-01
Last Modified:2011-10-04
Downloads:0

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