Physiological Studies on Rhizobium

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Abstract
No significant differences were observed in the rate and extent of oxygen consumption by R. meliloti in media containing glucose, mannitol, or sucrose. Galactose and ara-binose were superior to glucose for utilization by this organism on both nitrate and ammonium media. Maltose, lactose, inositol, dulcitol, and sorbitol with both forms of N, and raffinose and erythritol with ammonium N were decidedly inferior to glucose as a source of energy. Ammonium N seemed more suitable for utilization by R. meliloti than nitrate N, as measured by the total consumption of O2. Arabmose was distinctly superior to the other carbon compounds studied, as a source of energy for R. japonicum. Glucose, galactose, and xylose permitted approximately equal amounts of O2 consumption, Mannitol, mannose, maltose, glycerol, lactose, sucrose, and erythritol were utilized only slightly or not at all. Nitrate N seemed more suitable for utilization by R. japonicum than ammonium N.