TESTING OF EMBRYOGENIC AND NONEMBRYOGENIC CALLI OF EUROPEAN BLACK PINE (PINUS-NIGRA ARN) FOR DEFENSE REACTIONS TO THE FUNGUS PHAEOLUS-SCHWEINITZII

Embryogenic and non-embryogenic calli of European black pine (Pinus ni gra ARN.) were tested on defense reactions to the fungus Phaeolus schw einitzii (FR.) PAT. Embryogenic callus lines initiated from immature z ygotic embryos and consisted of suspensor-like cells and embryos in ea rly developmental stage have already shown weak defense reactions. Non - embryogenic lines derived from mature zygotic embryos had remarkabl e defense reactions. Our results suggest that the constitutive defense system of plant has already been formed during the embryo development .