STRAINS OF BACILLUS THURINGIENSIS WITH GROWTH-STIMULATING AND FUNGICIDAL ACTIVITY

The article presents the results of the study of growth-stimulating and antifungal activity of strains Bacillus thuringiensis ssp. fukuokaensis ssp. morrisoni, ssp. toumanoffi, ssp. dakota and ssp. amagiensis. The positive effect of all studied strains on morphometric parameters of spring rape and spring wheat seedlings was revealed. Treatment of spring rape seeds with spore-crystal mixtures of B. thuringiensis contributed to a significant increase in the length of roots by 1.93.4 times and sprouts – by 1.3-1.9 times, depending on the strain. Stimulation of plant growth was also observed in the inoculation of spring wheat seeds with suspension strains of B. thuringiensis. However, a significant positive effect was revealed only in the variant with the use of the strain of B. thuringiensisssp. fukuokaensis. There was a downward trend in the number of spring wheat seedlings affected with root rot when the seeds were treated with the strains of B. thuringiensisssp. morrisoni, ssp. dakota, ssp. amagiensis. In the experiments with pure cultures it was found that all tested strains of B. thuringiensis showed a high degree of antagonistic activity to two types of phytopathogens. The inhibitory activity of the strains of B. thuringiensis on the 10th day of the experiment with regard to Fusarium oxysporum ranged from 68 to 83%, Alternaria alternata – from 71 to 89%. The analysis showed that all studied strains of B. thuringiensis stimulated the growth of plants of spring rape and spring wheat and showed antifungal activity. The obtained data are of interest for further research in order to create multifunctional biological preparations for plant protection.

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