Study of the effect of nitrogen-fxing cyanobacteria on the growth rate of the Strawberry Sunrise T-4 strawberry variety

Abstract

The article presents the results of the study of nitrogenase activity of five strains of cyanobacteria
from the collection of phototrophic microorganisms of Al-Farabi Kazakh National University and their effect on the growth of strawberries. Nitrogen-fixing cyanobacteria were studied by strains Anabaena variabilis R-I-5, Anabaena sp. 7912, Anabaena sp. Z-1, Nostoc calsicola RI-3, Nostoc sp. S-2, and according
to the results obtained high activity of nitrogenase in the strain Anabaena variabilis R-I-5. In the study
of the effect of cells of different concentrations of the strain Anabaena variabilis R-I-5 on the growth of
strawberry Strawberry Sunrise T-4, it was found that its suspension of 24x106 cells/ml and 48x106 cell/
ml had a positive effect on strawberry growth. In addition, an increase in the number of strawberry roots
was observed in the suspension of cyanobacterial biomass 24x106 cell/ml. An increase in the number of
strawberry leaves, root length, stem height and a significantly higher yield of dry biomass of strawberries
were observed in the suspension of the study in the amount of 48x106 cell/ml. The optimal cell count of
the nitrogen-fixing cyanobacterium Anabaena variabilis R-I-5 suspension, which has a positive effect on
the growth of strawberry plants, was 48x106 cell/ml. The obtained results allow to use the nitrogen fixing
strain Anabaena variabilis R-I-5 for obtaining biological products in agrobiotechnology.
Key words: Nitrogen-fixing cyanobacteria strains, grow of Strawberry Sunrise T-4 variety, molecular
nitrogen absorption in air.