The article presents data on the reaction of 10 common winter wheat genotypes to culture filtrates of Alternaria alternata isolates. Through factorial analysis, the role of wheat genotype (42.2 ... 51.1%) in the source of variation in radicle length, stem length, seedling length was found. The A. alternata isolate factor presented a higher weight for germination (48.9%) and vigor index (49.0%). The association of the high level of the coefficient of heritability with the advanced genetic progress shows that in the control of growth and development characters additive factors are involved.
