Réponse du β-glucosyle de l'alcool coniférylique du Pinussylvestris à l'inoculation du Ceratocystisbruneociliata au liber

Abstract

Inoculation of stems of Pinussylvestris with Ceratocystisbruneociliata leads to a decrease in the concentration of heterosides in inner bark samples collected from the necrotic area. Controls were collected from the trunc side opposite to the inoculated area and from healthy trees. Acidic and enzymatic hydrolysis of the heteroside fraction followed by chromatographic and spectral analyses indicated that the main component of this fraction was β-glucosyl-coniferyl alcohol. The latter product of hydrolysis was also observed in infected tissues. The released glucose may serve as an energy source for defense reactions in which the aglycone could be utilized as a precursor for the production of lignin in the formation of protective barriers or in the direct inhibition of fungus growth.