Archives of Microbiology

, Volume 115, Issue 3, pp 259–263 | Cite as

A pleiotropic mutant of Rhodopseudomonas capsulata defective in nitrogen metabolism

  • Judy D. Wall
  • Bo C. Johansson
  • Howard Gest


Wild type strains of Rhodopseudomonas capsulata typically can use N2, NH 4 + , or various nitrogenous organic compounds as N sources for photosynthetic growth. One class of mutants selected for inability to grow on N2 (Nif) also shows simultaneous loss of capacity to obtain N from numerous organic substrates. When supplied at relatively high concentrations, ammonia can be used as the sole N source for growth of such strains. Enzymatic analysis of one mutant (W11) indicates that the pleiotropic effect on N nutrition is neither due to detectable alteration in the activities of nitrogenase or the initial enzymes responsible for bulk assimilation of ammonia (glutamine synthetase and glutamate synthase) nor to absence of systems required for catabolism of organic N sources. The phenotype of W11 (Nit; defective in N metabolism) appears to result from loss of ability to grow using low concentrations of ammonia (supplied externally or generated in vivo).

Key words

Rhodopseudomonas capsulata Photosynthetic bacteria N2 and ammonia metabolism N metabolism mutant Glutamine metabolism 


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Copyright information

© Springer-Verlag 1977

Authors and Affiliations

  • Judy D. Wall
    • 1
  • Bo C. Johansson
    • 1
  • Howard Gest
    • 1
  1. 1.Photosynthetic Bacteria Group, Department of BiologyIndiana UniversityBloomingtonUSA

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