A comparative assessment of the influence of various signal molecules – salicylic (SA) and jasmonic (JA) acids, chitooligosaccharides (COS), metabolites of Bacillus subtilis bacteria (MB) on the degree of infestation of the leaves and the activity of protective proteins in the plants of Solanum tuberosum L. infected with oomycete Phytophthora infestans Mont. de Bary is carried out. Studies were carried out on test-tube plants of potato of susceptible variety Early rose. It is revealed that processing plants SA, JA, COS and MB reduces the degree of infestation of potato leaves by P. infestans, but at varying degrees. The best protective effect provided the JA and the B. subtilis 26D bacterial strain. Treatment with SA, JA, COS and B. subtilis increased the level of H2O2 in potato plants. COS and B. subtilis 11VD had earlier stimulating effect on the production of hydrogen peroxide (24 h after infection). The maximum stimulating effect on the production of H2O2 in the case with treatment with SA and B. subtilis 26D at 48 hours after inoculation was revealed. SA and JA had a stimulating effect on the transcriptional activity of amylase inhibitor and proteinase inhibitor genes in uninfected potato plants and especially in infected ones. The possible mechanisms of increasing the resistance of potatoes to the pathogen of late blight by environmentally safe compounds are discussed. Very promising for potato plants is the creation and use of environmentally friendly drugs, the protective effect of which against P. infestans is based on the stimulation of H2O2 production and activation of hydrolase inhibitor gene expression in infected tissues.
Keywords: Solanum tuberosum, Phytophthora infestans, signal molecules, PR-proteins, ecologically safe crop production
ISSN 1995-4301
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