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Photosynthetic responses of Eucalyptus nitens at initial stages of root-rot infection


Agustini, L and Beadle, C and Barry, K and Mohammed, C, Photosynthetic responses of Eucalyptus nitens at initial stages of root-rot infection, Indonesian Journal of Forestry Research, 2, (1) pp. 9-20. ISSN 2355-7079 (2015) [Refereed Article]

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Copyright 2015 Indonesian Journal of Forestry Research

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Root-rots are known to be latent diseases that may be present in plants for an extended period without any noticeable expression of symptoms above ground. Photosynthetic responses of Eucalyptus nitens saplings artificially inoculated with the root-rot pathogen, Armillaria luteobubalina were examined to characterize the initial stages of root-rot infection. This study measured three photosynthetic parameters, i.e. photosystem II yield (Fv/Fm), chlorophyll content and photosynthetic capacity (Amax) for two strains of A. luteobubalina over a seven-month period. Root systems were either wounded or left intact before inoculation. A significant difference was observed in the Fv/Fm ratio between the uninoculated control and inoculated saplings. Photosystem II yield was considered the most sensitive parameter for the early detection of root-rot disease. Chlorophyll content and Amax decreased for all trees, including controls, during the period of the experiment, and most likely reflected host responses to seasonal change rather than treatment effects. Fungal re-isolations from symptomatic roots of inoculated trees confirmed the presence of A. luteobubalina. Findings from this preliminary trial indicated that there were detectable physiological changes associated with early infection of root-rot. However, to detect more widespread physiological changes an experiment of longer duration is needed.

Item Details

Item Type:Refereed Article
Keywords:Eucalyptus sp., artificial inoculation, chlorophyll content, photosynthetic rate, photosystem II yield, root disease ABSTRAK
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Forest health and pathology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Barry, K (Associate Professor Kara Barry)
UTAS Author:Mohammed, C (Professor Caroline Mohammed)
ID Code:104341
Year Published:2015
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-11-10
Last Modified:2016-05-09

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