Transfer of Virulence in Rhizobium trifolii


So far, very few reports concerning transformations in Rhizobium have appeared. Krasilnikov1 reported as early as 1941 that non-infective strains turned infective when they were grown for several months in a filtrate of a highly infective strain. By ultrasonic treatment and with preparations of deoxyribonucleic acid (DNA) Balassa2,3 has obtained transformations concerning several properties, for example, infective ability under formation of new host specificity, increase or decrease in nitrogen-fixing ability, variation in colony types, and changes in antigenic structure.

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LJUNGGREN, H. Transfer of Virulence in Rhizobium trifolii . Nature 191, 623 (1961).

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