Isolation and properties of Azospirillum lipoferum and Azospirillum brasilense surface polysaccharide mutants

  • K. Michiels
  • J. Vanderleyden
  • A. Van Gool
  • E. R. Signer
Part of the Developments in Plant and Soil Sciences book series (DPSS, volume 35)


Polysaccharide production by Azospirillum strains was indicated by fluorescence on growth media containing calcofluor. Mutants showing decreased and increased levels of fluorescence were obtained from A. lipoferum strain Sp59b by chemical mutagenesis, and from A. brasilense strain 7030 by Tn5 mutagenesis. One class of calcofluor dark mutants from 7030 synthesized an exopolysaccharide (EPS) probably different in composition from the parent EPS. However, not EPS, but an unidentified component seemed to determine the fluorescence phenotype. Another class of 7030 mutants could be complemented to wild type fluorescence with a cosmid bank.

Key words

Azospirillum calcofluor complementation EPS Rhizobium meliloti surface polysaccharide 


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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • K. Michiels
    • 1
  • J. Vanderleyden
    • 1
  • A. Van Gool
    • 1
  • E. R. Signer
    • 2
  1. 1.F.A. Janssens Memorial Laboratory for GeneticsHeverleeBelgium
  2. 2.Department of BiologyMassachusetts Institute of TechnologyCambridgeUSA

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