PHYSIOLOGICAL STUDIES ON RHIZOBIUM

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Abstract
Respiration exps. with these 3 spp. indicated that, in general, O consumption, and therefore growth, of R. trifolii and R. phaseoli are affected in the same manner as in R. leguminosarum (reported earlier). However, R. meliloti apparently re acts entirely differently to NH4Cl, NaNO3, urea and alanine, but in about the same manner to yeast extract (a complex material containing only ca. 7.6% N.). The reason for this physiological difference has not been satisfactorily explained. Neither is it known whether, after a statistical analysis of physiological reactions of several spp., the same general conclusions could be ap plied to the spp. as a whole, or whether certain reactions could be definitely linked with the efficiency of certain strains in fixing N symbiotically.

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