Preface. 1. Evolution and diversity in the legume-rhizobium symbiosis: Chaos theory? J.I. Sprent. 2. Recent developments in Rhizobium taxonomy; E. Martínez-Romero. 3. Host range, RFLP, and antigenic relationships between Rhizobium fredii strains and Rhizobium sp. NGR234; H.B. Krishnan, S.G. Pueppke. 4. Rapid identification of Rhizobium species based on cellular fatty acid analysis; B.D.W. Jarvis, S.W. Tighe. 5. Ammonium sensing in nitrogen fixing bacteria: Functions of the glnB and glnD gene products; C. Kennedy, N. Doetsch, D. Meletzus, E. Patriarca, M. Amar, M. Iaccarino. 6. Regulation of nodulin gene expression; F.J. de Bruijn, R. Chen, S.Y. Fujimoto, A. Pinaev, D. Silver, K. Szczyglowski. 7. Synthesis, release, and transmission of alfalfa signals to rhizobial symbionts; D.A. Phillips. F.D. Dakora, E. Sande, C.M. Joesph, J. Zón. 8. Role of rhizobial lipo-oligosaccharides in root nodule formation on leguminous plants; O. Geiger, T. Ritsema, A.A.N. van Brussel, T. Tak, A.H.M. Wijfjes, G.V. Bloemberg, H.P. Spaink, B.J.J. Lugtenberg. 9. Sucrose transport and hydrolysis in Rhizobium tropici; V.I. Romanov, E. Martínez-Romero. 10. Shoot/root assimilate allocation and nodulation of Vigna unguiculata seedlings as influenced by shoot light environment; M.J. Kasperbauer, P.G. Hunt. 11. Mechanism of osmotically regulated N-acetylglutaminylglutamine amide production in Rhizobium meliloti; L. Tombras Smith, A. Ameer Allath, G.M. Smith. 12. What triggers the regulation of nitrogenase activity in forage legumenodules after defoliation? U.A. Hartwig, J. Nösberger. 13. Nodulation and nitrogen fixation in extreme environments; L.M. Bordeleau, D. Prévost. 14. Analysis and regulation of legume inoculants in Canada: The need for an increase in standards; P.E. Olsen, W.A. Rice, L.M. Bordeleau, V.O. Biederbeck. 15. Recent developments in the actinorhizal symbioses; A.M. Berry. 16. Characterization of Bradyrhizobium japonicum chromosomal genes involved in the regulation of hup gene expression in free-living conditions and in controlling hydrogenase activity; C. van Soom, J. Vanderleyden, A.P. van Gool. 17. Characterization of Rhizobium galegae by REP-PCR, PFGE and 165 rRNA sequencing; I. Huber, S. Selenska-Pobell. 18. A hypothesis for the role of malic enzyme in symbiotic nitrogen fixation in soybean nodules; D.A. Day, R.G. Quinnell, F.J. Bergersen. 19. Eastern Canadian soybean field trials of rhizobial strain NS 1 in two commercial carriers; R.E. Sanders. 20. Nitrogen fixation efficiency of cold-adapted rhizobia on sainfoin (Onobrychis viciifolia): Laboratory and field evaluation; D. Prévost, L.M. Bordeleau, R. Michaud, C. Lafrenière, J. Waddington, V.O. Biederbeck. 21. Survival of Bradyrhizobium japonicum in pig slurry used as carrier for soil inoculation; G. Ciafardini, G.C. Turtura. 22. Plasmid DNA content of several agronomically important Rhizobium species that nodulate alfalfa, berseem clover, or Leucaena; F.M. Hashem, D. Kuykendall. 23. International FAO/IAEA programm
