The influence of Antifreeze and Nigor preparations treatment on the strawberry resistance to spring frosts

The article includes the results of researching the influence of treatments with the phytomodulator "Belyj zhemchug Antifriz" and the biopreparation "Nigor" on the resistance of strawberry plants to recurrent frosts of the spring period. The experiments were carried out on three varieties differing in ecological and geographical origin and resistance to the action of the studied stressor: Korona (Holland), Florence (Great Britain) and Marmolada (Italy). All varieties were treated with Antifreeze and Nigor preparations for the first time in early October 10 days before the expected frosts, and then in the spring in early and mid-May, respectively, the phenophase of the plant. We also used the same varieties treated with water as a control group. Spring frosts (-30 C) were modeled by artificial freezing in a climate chamber "Espec" PSL-2KPH (Japan). The degree of damage was assessed by the percentage of flowers and buds with damaged pistils and stamens, as well as by changes in the level of free proline, sugars, malondialdehyde (MDA) and peroxides. According to the results of the analysis of lipid peroxidation products, components of the antioxidant plant protection system and visual assessment of damage to flowers and buds, it was concluded that treatment with these drugs had a significant influence on increasing the resistance of strawberry plants to spring frosts. The different level of accumulation of the analyzed compounds in the studied varieties seems to be associated with both the different resistance of the varieties and, accordingly, the degree of formation of reactive oxygen species in the cells, and the higher activity of the antioxidant defense system that neutralizes them.