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Effect of phytohormones synthesized by rhizosphere bacteria on plants

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Abstract

New strains of rhizosphere microorganisms Azotobacter chroococcum Az d10, Bacillus megaterium Pl-04, and Bacillus mucilaginosus B-1574 were found to be able to synthesize cytokinins (CKs) and indolylacetic acid (IAA). Three forms of CKs—dihydrozeatin riboside, isopentenyl adenosine, and trans-zeatin riboside—were identified, whose ratio was different in the three bacterial cultures. Inoculation of cucumber (Cucumis sativus L.) plants increased the content of CKs and IAA in them by 35.6 and 21.3%, respectively, and also stimulated seed germination and increased the growth rate, the biomass of shoots, the number of lateral roots, and the root hair area, which ensured better plant nutrition. The IAA/CKs ratio shifted during bacterization towards CKs due to increase in the content of riboside forms, which apparently caused growth stimulation.

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Authors and Affiliations

  1. Siberian Institute of Plant Physiology and Biochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk, 664033, Russia

    M. G. Sokolova & G. P. Akimova

  2. Tomsk State University, Tomsk, 634050, Russia

    O. B. Vaishlya

Authors
  1. M. G. Sokolova
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  2. G. P. Akimova
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  3. O. B. Vaishlya
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Correspondence to M. G. Sokolova.

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Original Russian Text © M.G. Sokolova, G.P. Akimova, O.B. Vaishlya, 2011, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2011, Vol. 47, No. 3, pp. 302–307.

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Sokolova, M.G., Akimova, G.P. & Vaishlya, O.B. Effect of phytohormones synthesized by rhizosphere bacteria on plants. Appl Biochem Microbiol 47, 274–278 (2011). https://doi.org/10.1134/S0003683811030148

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  • DOI: https://doi.org/10.1134/S0003683811030148

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