No abstract

Objective. To study the amino acid composition in the tops of alfalfa under different water supply (60 % MVC (maximum water capacity) and 30 % MVC) depending on the inoculum strain (Sinorhizobium meliloti 425a, T17, AC08). Methods. Microbiological (bacterial cultivation), physiological (vegetation experiment), biochemical (determination of amino acid content in the tops of plants). Results. It was established that the qualitative amino acid composition in the tops of ALFALFA was identical in all variants. However, quantitative content of the studied samples differed depending on the inoculum strain and water supply. It was found that aspartic and glutamic acids, leucine and lysine are dominant in the tops of alfalfa under different water supply. In the absence of moisture, an increase in the content of individual amino acids was reported at the background of Sinorhizobium meliloti AC08 and T17, while inoculation with Sinorhizobium meliloti 425a resulted in a decrease in the content of all amino acids except tyrosine. In plants exposed to water stress, a tendency towards decrease in the content of glutamic acid at the background of bacterization with Sinorhizobium meliloti 425a and increase — under inoculation with Sinorhizobium meliloti T17 and AC08 was reported, which may support the use of the latter to increase the ability of symbiotic systems to recover during a post-stress period. Conclusion. Pre-sowing inoculation of alfalfa of the variety Laska with new active strains of Sinorhizobium meliloti AC08 and T17 helps to increase the content of amino acids, in particular essential, in the tops of plants, both under optimal conditions of moisture and insufficient water supply. The prospects of using new strains of rhizobia in the cultivation of alfalfa for green mass under the conditions of optimal water supply and drought has been verified.