The Interplay Between Salicylic and Jasmonic Acid During Phytopathogenesis - Salicylic Acid: Plant Growth and Development - page 288

gene, in infected plants was 2.5 times higher than in non-infected ones. In contrast
the individual influence of B. subtilis 26D resulted in permanent maximal level of
transcriptional activity of this gene in infected plants in comparison with non-
treated control ones.
Simultaneous treatment of plants by a mix of SA and B. subtilis 26D led to
rather high level of anionic peroxidase gene transcripts, i.e. the influence of
Bacillus (like JA) is not being suppressed by SA. In infected plants treated by
SA ? B. subtilis 26D expression of M21334 gene was highest among the all
variants of the experiment. The simultaneous use of JA and B. subtilis 26D,
activation of transcriptional activity of gene under study wasn't observed, but we
found 50 % decrease of the expression of anionic peroxidase gene on the first day
of post infection. It's to be noted that increasing of transcripts level was in inverse
ratio to disease symptom development. Maximal expression of M21334 led to
minimal level of lesions.
According to our results, in potato plants during the development of the defence
reactions against late blight pathogen JA-mediated signal system prevailed over
SA-mediated system and was more efficient. Bacterial strain B. subtilis 26D dis-
played rather high defence stimulating activity similar to that of JA. Accordingly,
on the basis of the data it can be possible to propose a preliminary hypothesis that
ISR triggered by B. subtilis 26D is closely related to JA-mediated reactions.
Another important conclusion based on our investigations is the possibility of
using of composite preparation on the basis of SA and JA (or B. subtilis 26D)
combines growth- and defence

stimulating activities as well as SA-induced

resistance to a rage of abiotic factors (Belkadhi et al. 2012 ).
This work was supported by Ministry of Education and Science of the Russian
Federation within a framework of Research and Educational Staff of Innovation
Russia Federal Special Purpose Program (State contract P-339).

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