The Stability of Cultures of Rhizobium

Abstract

6 aberrant cultural types, most of them chromogenic, were developed from single cell cultures of the recognized, normal form of R. trifolii by altering the growth conditions and by cultivation of culture filtrates by the Hauduroy technique. Evidence for relationship among the aberrant types and the original form was drawn from exps. in which the types were caused to change from one to another. Attempts were made to derive the original form from the aberrant ones, with success in only 2 instances.