Mikrobiol. Z. 2015; 77(5):95-103. Ukrainian.
doi: https://doi.org/10.15407/microbiolj77.05.095

Auxins and Cytokinines Synthesis by Bradyrhizobium japonicum Under Flavonoids Influence

Leonova N.O.

Zabolotny Institute of Microbiology and Virology, NAS of Ukraine
154 Akad. Zabolotny Str., Kyiv, 03143, Ukraine

Aim. Research the ability of different by effectiveness symbiotic nitrogen-fixing soybean bacteria Bradyrhizobium japonicum to the synthesis of phytohormones-stimulators auxins and cytokinins for the actions of plant flavonoids genistein and naringenin. Methods. Extracellular phytohormonal compound isolated from the supernatant culture liquid of the soybean rhizobia by redistribution of phytohormones in two phases solvent immiscible with each other. Auxins and cytokinins were determined by thin layer spectra densitometry chromatography. Results. Shown the ability of symbiotic diastrophic soybean strains to synthesize auxins (4 - 1067 mg/g of absolutely dry biomass) and cytokinins (141 - 1554 mg/g of absolutely dry biomass). Cultivation soybean rhizobia in the presence of flavonoid compounds genistein and naringenin leads to the narrowing of the range and reducing the number of phytohormones: unchecked synthesis of indole-3-carboxylic acid, indole-3-carbinol, indole-3-acetic acid hydrazide and zeatin. Conclusions. Depressing effect of flavonoids on the phytohormones in soybean rhizobia synthesis is probably due to changes in metabolism microsymbiotic bacteria that are not aimed at the synthesis of secondary metabolites and to launch effective nodulating mechanisms, and also the concentration of flavonoid compounds in the nutrient medium.

Key words: Bradyrhizobium japonicum, plant hormones, auxins, cytokinins, flavonoids, soybean.

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