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This investigation was suggested by the fact that Gerretsen et al. in 1923 reported the isolation of a bacteriophage from the root nodules of clover, lupine, and serradella, and also that the dissolution of the bacteria in the nodules of leguminous plants might be due to the action of the bacteriophage. The bacteriophage was specific in its action for the bacteria of the species of leguminous plants from which the lytic agent was isolated, i.e., the phage isolated from clover nodules produced only a slight action upon Rhizobia from common beans and none whatever upon Rhizobia from lupine. The phage from serradella failed to produce lysis of the nodule bacteria from lupine, vetch, peas, clover and sanfoin. Gerretsen and his associates were able to isolate the phage from the roots and stems of the leguminous plants as well as from garden and field soil. The phage resisted heating for fifteen minutes at 65°C. and was qwute resistant to drying and ultra-violet light. Attempts to produce lysis of the homologous organisms on agar plates were unsuccessful, although an inhibition of growth was noted. Later Grijns in 1926 and 1927 was able to produce lysis on solid media by employing meat extract-sucrose agar which decreased the production of slime by the nodule organisms. He.concluded that leguminous plants do not produce the phage and that the phage does not influence nodule formation or the dissolution of the contents of the nodule. Israilsky (1926) in commenting on the work of the above investigators states that it may have significance in explaining the immunity of the leguiminous plants to the root nodule organisms.

The Isolation of a Bacteriolytic Principle from the Root Nodules of Red Clover