Applied Biochemistry and Microbiology

, Volume 53, Issue 2, pp 201–208 | Cite as

The new bacterial strain Paenibacillus sp. IB-1: A producer of exopolysaccharide and biologically active substances with phytohormonal and antifungal activities

  • M. D. Bakaeva
  • S. P. Chetverikov
  • T. Yu. Korshunova
  • O. N. Loginov


The bacterial strain IB-1, which exhibits antagonism towards phytopathogens and stimulates the growth of agricultural plants, was isolated from the soil. Analysis of the cultural, morphological, physiological, and biochemical features and nucleotide sequences of the genes 16S rRNA and gyrB, as well as the fatty acid composition, made it possible to attribute the strain IB-1 to the genus Paenibacillus; however, the results did not provide an unambiguous conclusion on its species. The strain Paenibacillus sp. IB-1 possesses nitrogenase activity, the ability to synthesize indoleacetic acid and cytokinin-like compounds, and antagonistic activity towards phytopathogenic fungi, which indicates prospects for its use as a biological product for agricultural purposes. A high-viscous exopolysaccharide was isolated from the cultural fluid of Paenibacillus sp. IB-1. Based on the data from IR and NMR spectroscopy, it was shown to be a heteropolymer comprised of one to four linked α-L-guluronic acid and β-D-mannuronic acid residues. The exopolysaccharide was successfully tested as an adhesive for presowing treatment of barley and wheat seeds with biofungicides.


genus Paenibacillus antifungal activity nitrogenase activity phytohormones exopolysaccharide pre-sowing seed treatment 


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Copyright information

© Pleiades Publishing, Inc. 2017

Authors and Affiliations

  • M. D. Bakaeva
    • 1
  • S. P. Chetverikov
    • 1
  • T. Yu. Korshunova
    • 1
  • O. N. Loginov
    • 1
  1. 1.Ufa Institute of BiologyRussian Academy of SciencesUfaRussia

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