[Serologic properties of mutants of Rhizobium trifolii and their interrelationship with effectiveness]

UV and gamma irradiation of Rhizobium trifolii, strains 347a and 311a, produced their mutants with changed antigenic properties and effectiveness. The extent of changes of antigens did not depend on the dose of irradiation because mutants that completely lost antigens typical of the parent strains were obtained at different doses of UV and gamma rays. No correlation was established between the antigenic properties of the mutants of Rhizobium trifolii and their effectiveness.