Safflower (Carthamus tinctorius L.) is drought resistant plant, but the adequate irrigation is important for the increasing of safflower yield. The effects of drip irrigation associated with pre-sowing gamma irradiation of seeds on plant growth and yield were investigated. The seeds were irradiated by gamma rays (60 Co) at various doses (50, 100, 150Gy). The safflower plants were grown under drip irrigation and rainfed conditions of the Republic of Moldova in season of 2017. Modifications of bio-morphological (height, number of secondary branch, developed and undeveloped inflorescence) and yield attributing (number of seeds per head and per plant, weight of seeds per plant and 1000-seed weight) characters of safflower were studied. The results showed that the drip irrigation influenced positive and statistically significant (p≤0.001) on all studied characters of safflower. The plant grown under irrigation had the number of developed inflorescences, the number of seeds and the weight of seeds per plant, respectively 1.83, 1.81 and 2.50 times more than rainfed plants; as well as undeveloped inflorescence less 2.47 times. The contribution of pre-sowing irradiation was not so pronounced. The impact of factors (irradiation, irrigation) and their interaction for the improvement of bio-morphological and yield attributing characters were determined. The significant impact of growing condition on the number of seeds per plant at p≤0.01, weight of seeds per plant and 1000-seeds weight at p≤0.01 was established. The gamma radiation had the contribution to changes in 1000-seeds weight but the contribution of growing condition on this character was 15.7 times stronger.

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The defensive response of 4 tomato genotypes to Tobacco Mosaic Virus or Tomato Aspermy Virus was evaluated according to 3 indices - peroxidase and catalase activities and hydrogen peroxide content. The response was differentiated according to the applied viral infection, the genotype and dynamics of the infection process. Particularities have been attested in the reaction of the antioxidative response at different stages of the pathogenesis - increasing or decreasing of the evaluated indices compared to the healthy control.

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.