

Preface. 1. Evolution and diversity in the legume-rhizobium symbiosis: Chaos theory? J.I. Sprent. 2. Recent developments in Rhizobium taxonomy; E. Mart?nez-Romero. 3. Host range, RFLP, and antigenic relationships between Rhizobium fredii strains and Rhizobium sp. NGR234; H.B...