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Oxidative Metabolism of a Pigmented Mutant of Rhizobium meliloti and its Revertants
Author(s) -
DOGRA R. C.,
VYAS THE LATE S. R.
Publication year - 1978
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1978.tb00782.x
Subject(s) - mutant , rhizobium , biology , citric acid cycle , strain (injury) , oxidative phosphorylation , reversion , tricarboxylic acid , biochemistry , rhizobiaceae , bacteria , metabolism , symbiosis , phenotype , gene , genetics , anatomy
Non‐infective pigmented mutants of Rhizobium meliloti have been obtained by u.v. irradiation. The majority of colourless revertants of a pigmented mutant obtained by u.v. irradiation nodulated the host plant indicating that pigmentation in rhizobium and ability to nodulate are genetically linked and may have some pleiotrophic effect. All the nodulating revertants and the parent strain oxidized pentoses, hexoses, dihexoses, tricarboxylic acid (TCA) cycle intermediates and related compounds at a higher rate than the non‐nodulating revertants and pigmented mutant. Significant differences in the oxidation of pentoses and TCA cycle intermediates in nodulating and non‐nodulating revertants indicate that these two energy yielding pathways are operating less efficiently in non‐nodulating revertants and suggests that the working of these two pathways may be essential for the nodulation process.