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All Journal Indonesian Journal of Forestry Research Indonesian Journal of Forestry Research
Chris Beadle
CSIRO Ecosystem Sciences, Private Bag 12, Hobart
Agriculture, Biological Sciences & Forestry

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Journal : Indonesian Journal of Forestry Research

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PHOTOSYNTHETIC RESPONSES OF Eucalyptus nitens AT INITIAL STAGES OF ROOT-ROT INFECTION Agustini, Luciasih; Beadle, Chris; Barry, Karen; Mohammed, Caroline
Indonesian Journal of Forestry Research Vol 2, No 1 (2015): Indonesian Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

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Abstract

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.
PHOTOSYNTHETIC RESPONSES OF Eucalyptus nitens AT INITIAL STAGES OF ROOT-ROT INFECTION Agustini, Luciasih; Beadle, Chris; Barry, Karen; Mohammed, Caroline
Indonesian Journal of Forestry Research Vol 2, No 1 (2015): Indonesian Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

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Abstract

PHOTOSYNTHETIC RESPONSES OF Eucalyptus nitens Maiden AT INITIAL STAGES OF ROOT-ROT INFECTION Agustini, Luciasih; Beadle, Chris; Barry, Karen; Mohammed, Caroline
Indonesian Journal of Forestry Research Vol 2, No 1 (2015): Indonesian Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2015.2.1.9-20

Abstract

Photosynthetic responses associated with initial stages of root-rot disease have been studied through setting up an artificial inoculation of Eucalyptus nitens trees with a root-rot pathogen, Armillaria luteobubalina. Trees were inoculated with two different strains of A. luteobubalina. Root systems were either wounded or left intact before inoculation. Three photosynthetic parameters, i.e. photosystem II yield (Fv/Fm), chlorophyll content and photosynthetic rate (Amax) were assessed during six-months of observation. Photosystem II yield was the most sensitive to root-rot infection. A significant difference in Fv/Fm between the unwounded control (UW-P0) and other treatments was observed, and the difference  was  affected by interaction between time and treatment factors (F- ratio = 3.798, p-value = 0.005).  Chlorophyll content and photosynthetic rate (Amax) decreased for all trees, including controls, during the period of the experiment. The decrease was more marked in treated than control trees, and the changes more determined by the time factor  (p-value <0.0001). The root systems of inoculated trees were examined and re-isolations of A. luteobubalina from symptomatic roots were carried out to confirm infection with A.luteobubalina of E. nitens trees. This preliminary trial was successful and did indicate that there were detectable physiological changes associated with early infection of root-rot. However the experiment required a longer duration for more widespread physiological changes to be detected.  
Co-Authors Caroline Mohammed Karen Barry Luciasih Agustini