Studying the particularities of manifestation of defensive indicators – POX and PPO in case of in-fection with 2 types of viruses of different virus-host combinations (sensitive, tolerant, resistant) was per-formed in basis of analysis of variance. The obtained results denote a significant contribution of all ana-lyzed factors in the variability of PPO and POX indices, the major contribution returning to the genotype, followed by viral infection, the type of viral infection with a variable dose of contribution depending on the applied matrix. The PPO index expressed a higher specificity of the genotype response depending on the virus applied compared to POX. At the same time, it was found that TAV had a higher contribution in the variability of POX and PPO, compared to TMV.