Abstract
Bacillus thuringiensis are the most common biological insect pest control agents. Some strains of B. thuringiensis are capable of endophytic existence, but the mechanisms of their interaction with plants and the role of phytohormones in this, for example, salicylic acid, which plays a key role in the development of plant immune responses against pathogenic microorganisms, have not been studied. When potato plants were treated with the endophytic strain B. thuringiensis B-5351 and salicylic acid simultaneously, an increase in the number of living bacterial cells in the internal tissues and a more than two-fold reduction in the area affected by late blight on the leaves was observed, relative to the control and action of B. thuringiensis B-5351 separately. The increase in plant resistance was accompanied by the accumulation of transcripts of the gene AY089962encoding the proteinase inhibitor and the activation of its protein product, which was more significant than after individual treatments. Under the field conditions (2020-2021), the treatment of plots with B. thuringiensis B-5351 alone did not reduce the degree of leaf spots infestation, however, in combination with salicylic acid, this indicator decreased by 20-25%. In 2020, the joint treatment of plants led to an increase in the total yield by an average of 20% relative to the control plots, as well as the yield of marketable tubers of the >80 g fraction. In 2021, only the treatment with salicylic acid led to an increase of total yield, but when combined with B. thuringiensis B-5351, the mass of large tubers increased.
Published Version
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