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The authors studied the effect of treatment with bacteria  Bacillus subtilis  Cohn (strains 26D) and  B. thuringiensis  Berliner (strain B-6066) on the hydrogen peroxide (H 2 O 2 ) content, the activity of hydrolytic enzymes and their protein inhibitors in potato plants  (Solanum tuberosum  L.) in connection with development of resistance to the late blight pathogen - oomycete  Phytophthora infestans  Mont. de Bary. Studies were carried out on potato plants of the susceptible Early Rose potato cultivar that were treated with a suspension of  B. subtilis  and  B. thuringiensis  bacteria (10 8  cells/ml) and infected with  P. infestans  (10 7  spores/ml). A decrease in the degree of leaf damage by oomycete was revealed under the influence of the genus  Bacillus  bacteria, depending on the strain. The increase in potato resistance to  P. infestans  infection was mediated by the stimulating effect of the  B. subtilis  26D and the  B. thuringiensis  B-6066 bacteria on the concentration of H 2 O 2 , the modulating effect on the activity of hydrolytic enzymes and the enhancement of the transcriptional activity of protease and amylase inhibitor genes in plant tissues. Differences in the degree of activation of the transcriptional activity of hydrolase inhibitor genes by the  B. subtilis  26D and the B.  thuringiensis  B-6066 bacteria were revealed, which suggests differential ways of forming the potato resistance to  P. infestans  under their influence.

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Influence of the genus Bacillus bacteria on the content of H2O2 and the activity of hydrolases and their inhibitors in potato plants during Phytophthora infestans Mont. de Bary infection