Article

Induced resistance of Norway spruce, variation of phenolic compounds and their effects on fungal pathogens

Forest Pathology (impact factor: 1.74). 08/2009; 30(2):97 - 108. DOI:10.1046/j.1439-0329.2000.00189.x pp.97 - 108

ABSTRACT Three clones of Norway spruce (Picea abies) were studied for their response to mass-inoculation with the blue-stain fungus Ceratocystis polonica. The effect of different pretreatments (fungal inoculation and wounding) before mass-inoculation was investigated for their possible role in an acquired resistance reaction. Pretreated trees showed enhanced resistance to the subsequent mass-inoculation relative to control trees that received no pretreatment. Furthermore, the fungal colonization of inoculated trees was less than that of wounded trees. The phenolic content of the bark, analysed by RP-HPLC, was compared in trees receiving different treatments. Trees inoculated with C. polonica had higher average concentration of (+)-catechin, taxifolin and trans-resveratrol than wounded trees. Both inoculated and wounded trees had higher average concentrations of these compounds than control trees. The effect of the phenolic extract of Norway spruce bark on the growth of the root rot fungus Heterobasidion annosum and the blue-stain fungi C. polonica and Ophiostoma penicillatum were investigated in vitro. Heterobasidion annosum was not negatively affected, and the extracts had fungistatic effects on the blue-stain fungi. The growth of O. penicillatum was more inhibited than the growth of the more aggressive C. polonica.

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Keywords

acquired resistance reaction
 
aggressive C. polonica
 
blue-stain fungi C. polonica
 
blue-stain fungus Ceratocystis polonica
 
control trees
 
different pretreatments
 
different treatments
 
fungal colonization
 
fungal inoculation
 
inoculated trees
 
Norway spruce
 
Norway spruce bark
 
Ophiostoma penicillatum
 
phenolic content
 
Picea abies
 
possible role
 
Pretreated trees
 
root rot fungus Heterobasidion annosum
 
subsequent mass-inoculation
 
Trees inoculated