Abstract
There was researched the effect of Bacillus subtilis bacteria in combination with salicylic (SA) and jasmonic (JA) acids on the state of the pro / antioxidant system (hydrogen peroxide content, catalase, peroxidase, superoxide dismutase activity) in connection with the development of potato resistance to late blight pathogen - oomycete Phytophthora infestans (Mont.) de Bary under moisture deficit conditions. Plants grown from microtubers of the Rannyaya Rosa cultivar were sprayed with a suspension of B. subtilis (108 cells / ml) and a mixture of bacteria with SA (10-6 M), JA (10-7 M), SA + JA (1:1). 3 days after treatment, the plants were infected with P. infestans (105 spores / ml) and cultivated under artificial soil drought conditions by reducing irrigation. When soil moisture reached 40±5% (7 days after infection), biochemical parameters were assessed in plants. A decrease in the degree of leaves damage by P. infestans was revealed when treated with B. subtilis in combination with SA and JA. The mechanism of increasing the resistance of potato plants to late blight when treated with Bacillus subtilis bacteria in combination with signaling molecules under conditions of drought was associated with the accumulation of H2O2 and modulation of antioxidant enzymes activity.
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