Abstract
The resistance of Sitka spruce ( Picea sitchensis(Bong.) Carr.) stem bark tissues to the root and butt rot pathogen Heterobasidion annosum(Fr.) Bref. was reduced in trees grown for 275 days in an atmosphere supplemented with ozone (120 nmol mol -1) compared with those grown in charcoal-filtered or ambient air. Levels of the stilbene glucosides astringin and isorhapontin, the main constitutive antifungal compounds in the bark of P. sitchensiswere not altered by the ozone treatment; neither was their accumulation in young stem tissues. However, the amount of induced lignification in living bark tissues at the margin of fungal lesions was reduced in stem lengths cut from ozone treated trees, following inoculation in vitrowith H. annosum. The starch content in the xylem of these ozone fumigated trees was reduced in comparison with the other treatments. These results are discussed in relation to disease resistance and antimicrobial defence in P. sitchensis.
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