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Appl Environ Microbiol. 1984 October; 48(4): 683-689
Copyright © 1984, American Society for Microbiology. All Rights Reserved.

Isolation and Characterization of Dinitrogen-Fixing Bacteria from the Rhizosphere of Temperate Cereals and Forage Grasses

Torbjörn Lindberg* and Ulf Granhall

Department of Microbiology, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden

ABSTRACT

N2(C2H2)-fixing bacteria were isolated from the rhizosphere of various cereals and forage grasses grown in the greenhouse and from the rhizosphere of field-grown wheat in Sweden. All 46 isolates from the greenhouse plants lost their nitrogenase activity during purification. By imposing a stronger selection pressure, we obtained pure isolates with nitrogenase activity from field-grown wheat. Some isolates were identified as Enterobacter agglomerans and Bacillus polymyxa, but several bacteria of uncertain taxonomy also occurred. One of the isolates grew and reduced acetylene only in the presence of other bacteria or certain vitamins. Species of Azotobacter or Azospirillum could not be isolated from the rhizosphere of any of the cereals and forage grasses studied.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1984 October; 48(4): 683-689
Copyright © 1984, American Society for Microbiology. All Rights Reserved.



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Copyright © 1984 by the American Society for Microbiology. All rights reserved.