Logo IPI  
Journal > Indonesian Journal of Forestry Research > PHOTOSYNTHETIC RESPONSES OF Eucalyptus nitens AT INITIAL STAGES OF ROOT-ROT INFECTION

 

Full Text PDF (1,232 kb)
Indonesian Journal of Forestry Research
Vol 2, No 1 (2015): Indonesian Journal of Forestry Research
PHOTOSYNTHETIC RESPONSES OF Eucalyptus nitens AT INITIAL STAGES OF ROOT-ROT INFECTION
Agustini, Luciasih ( enter for Forest Conservation and Rehabilitation of FORDA)
Beadle, Chris ( CSIRO Ecosystem Sciences, Private Bag 12, Hobart)
Barry, Karen ( Tasmanian Institute of Agriculture, University of Tasmania, Private Bag 98, Hobart)
Mohammed, Caroline ( Tasmanian Institute of Agriculture, University of Tasmania, Private Bag 98, Hobart)
Article Info   ABSTRACT
Published date:
28 Apr 2015
 
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.
Copyrights © 2015