Current Issues in Symbiotic Nitrogen Fixation

1. Advances in the positional cloning of nodulation genes in soybean.- 2. Molecular analysis of actinorhizal symbiotic systems: Progress to date.- 3. Diversity of Rhizobia isolated from various Hedysarum species.- 4. Diazotrophic endophytes: progress and prospects for nitrogen fixation in monocots.- 5. Drought-avoidant soybean germplasm maintains nitrogen-fixation capacity under water stress.- 6. Phylogeny and taxonomy of rhizobia.- 7. Comparison of rhizobitoxine-induced inhibition of ?-cystathionase from different bradyrhizobia and soybean genotypes.- 8. Assimilation of nod gene inducer 14C-naringenin and the incorporation of labelled carbon atoms into the acyl side chain of a host-specific Nod factor produced by Rhizobium leguminosarum bv. viciae.- 9. Corresponding 16S rRNA gene segments in Rhizobiaceae and Aeromonas yield discordant phylogenies.- 10. Rapid evaluation of peat-base legume inoculant using immunomagnetic beads for cell retrieval and fluorescent nucleic acid probes for viability analysis.- 11. Detection of genetic variation in Bradyrhizobium japonicum USDA 110 variants using DNA fingerprints generated with GC rich arbitrary PCR primers.- 12. Mimosine produced by the tree-legume Leucaena provides growth advantages to some Rhizobium strains that utilize it as a source of carbon and nitrogen.- 13. Subnanomolar concentrations of membrane chitolipooligosaccharides from Rhizobium leguminosarum biovar trifolii are fully capable of eliciting symbiosis-related responses on white clover.- 14. Analysis of the two nodulins, sucrose synthase and ENOD2, in transgenic Lotus plants.- 15. Hopanoid lipids in Bradyrhizobium and other plant-associated bacteria and cloning of the Bradyrhizobium japonicum squalene-hopene cyclase gene.- 16. Presence of unique repeatedinsertion sequences in nodulation genes of Rhizobium 'hedysari'.- 17. Enhanced competitiveness of a Bradyrhizobium japonicum mutant strain improved for nodulation and nitrogen fixation.- 18. Phage susceptibility and plasmid profile analysis of Sinorhizobiumfredii.- 19. A diazotrophic bacterial endophyte isolated from stems of Zea mays L. and Zea luxurians Iltis and Doebley.- 20. Identification of enzymes involved in indole-3-acetic acid degradation.- 21. Toward a new concept of the evolution of symbiotic nitrogen fixation in the Leguminosae.- 22. Lipopolysaccharide core components of Rhizobium etli reacting with a panel of monoclonal antibodies.- 23. Diversity in symbiotic specificity of cowpea rhizobia indigenous to Zimbabwean soils.- 24. Host genetic control of symbiosis in soybean (Glycine max L.).- 25. A comparison of the binding of Agrobacterium tumefaciens and Rhizobium meliloti to alfalfa roots, carrot suspension culture cells, and Arabidopsis thaliana root segments.- 26. Symbiotic effectiveness of marked rhizobial and bradyrhizobial mutants in pea, pigeonpea and mungbean.