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Bacterial endophytes of Trans-Ili Alatau region's plants as promising components of a microbial preparation for agricultural use

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Mukasheva T., Berzhanova R., Ignatova L., Omirbekova A., Brazhnikova Y., Sydykbekova R., Shigaeva M.

In this study, 382 isolates of bacterial endophytes from tissues of plants grown in the foothills and piedmont plains of the Trans-Ili Alatau were isolated. It was found that certain strains actively produce indole-3-acetic acid (IAA) in a medium containing l-tryptophan. Among the strains studied, 26 strains (66%) showed a positive response to production of IAA. Bacteria synthesized IAA in the range of 18.6 ± 1.1 to 82.4 ± 2.3 µg/ml. IAA was synthesized more actively by Streptosporangium sp. KK1 (44.1 µg/ml), Rhodococcus sp. KK 2 (42.5 µg/ml), Streptomyces tendae KK3 (44.9 µg/ml) strains. The most active auxin's producer is a Jeotgalicoccus halotolerans BAK1 strain, whose total level of IAA production reached 82.4 µg/ml. Such strains as Streptomyces griseorubiginosis KK4, Streptomyces sp. KK5 and Jeotgalicoccus halotolerans BAK1 were found to have a significant stimulating effect which was reflected in the increase of the length of the roots of soybean and barley. As a result, 8 promising strains with fungicidal, growth-stimulating, phosphorus dissolving and enzymatic activities were selected for the further development of highly microbiological preparations for crop research.

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1 Acta Biochimica Polonica

1 2016

1 Berzhanova R.

1 Brazhnikova Y.

1 Ignatova L.

1 Mukasheva T.

1 Omirbekova A.

1 Shigaeva M.

1 Sydykbekova R.

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Bacterial endophytes of Trans-Ili Alatau region's plants as promising components of a microbial preparation for agricultural use