Abstract
Both application of the crude toxin preparation from Drechslera teres and treatment with fractions of this toxin induced similar cytological defects in the leaf tissue selected from Hordeum vulgare L., like the inoculation of the pathogen: changes in chloroplast- and mitochondria-structure, necrosis of single cells. The toxin fraction 6 with the highest biological activity still triggered cytological detectable changes in the leaf-tissue of the susceptible barley variety ‘Femina’ at a concentration of 1 ppm. Tests of barley genotypes with a defined degree of resistance against the pathogen showed, that the toxin induced cytological damages are useful for a differentiation between resistant and susceptible plants. The host nonspecifity of the D. teres-toxin also could be demonstrated at the ultrastructural level in selected non-host plants.
Published Version
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