New Horizons in Nitrogen Fixation: Proceedings of the 9th International Congress on Nitrogen Fixation, Cancun, Mexico, December 6–12, 1992

Front Matter....Pages i-xvi
Front Matter....Pages 1-1
Introductory Remarks at the Overview Session....Pages 3-4
Nitrogenases: Distribution, Composition, Structure and Function....Pages 5-18
Rhizobium and Legume Nodulation: A Molecular Dialogue....Pages 19-30
Plant Function in Nodulation and Nitrogen Fixation in Legumes....Pages 31-42
Organization and Regulation of Nitrogen Fixation Genes....Pages 43-54
The Role of Respiration in Symbiotic Nitrogen Fixation....Pages 55-64
Evolution since Knoxville: Were Nitrogen-Fixing Organisms Wise to Inhabit Land Plants?....Pages 65-76
Front Matter....Pages 77-77
An Integrated, Interdisciplinary Approach to Understanding the Chemistry of Nitrogenases....Pages 79-82
Structures and Functions of the Nitrogenase Proteins....Pages 83-88
The Crystal Structure of the Nitrogenase MoFe Protein from Clostridium Pasteurianum ....Pages 89-94
Kinetics and Mechanism of Nitrogenase — A Role for ‘P’ Centres in Dinitrogen Reduction....Pages 95-100
 Nif Gene Products and Their Roles in Nitrogen Fixation....Pages 101-104
Intermolecular Electron Transfer and Substrate Reduction Properties of MoFe Proteins Altered by Site-Specific Amino Acid Substitution....Pages 105-110
Use of Fe Protein Altered at Specific Amino Acid Positions to Probe Its Function in Nitrogenase Catalysis....Pages 111-116
Metal Regulation of Nitrogenases and Molybdenum Transport in Azotobacter Vinelandii ....Pages 117-122
Regulatory Role of Molecular Chaperones in Nitrogenase Biogenesis....Pages 123-128
Front Matter....Pages 155-155
Nod Factors from Rhizobium Fredii USDA257....Pages 157-158
The Sulfate Group on the Reducing End Protects Nod Signals of R . Meliloti Against Hydrolysis by Medicago Chitinases....Pages 159-164
The Function of the Rhizobial NodABC and NodFEL Operons in the Biosynthesis of Lipo-Oligosaccharides....Pages 165-170
Chemical Signaling of Rhizobium Nodulating Bean....Pages 171-175
Front Matter....Pages 155-155
 Bradyrhizobium Japonicum Strains Produce Multiple 2–0-Methylfucose-containing Lipo-Oligosaccharide Nodulation Signals....Pages 177-182
 Nod Genes and Nod Factors of Rhizobium Species NGR234....Pages 183-189
Nod Factor Production by Azorhizobium Caulinodans Strain ORS571....Pages 191-196
Signals Released from Alfalfa Regulate Microbial Activities in the Rhizosphere....Pages 197-202
Exopolysaccharides and Rhizobium Meliloti -Alfalfa Interactions....Pages 203-206
The Role of Rhizobium Meliloti Surface Polysaccharides in Nodule Development....Pages 207-212
 Rhizobium Leguminosarum CE3 Lipopolysaccharide Structure Required in Symbiosis with Bean....Pages 213-216
Front Matter....Pages 265-265
Pea Nod - Mutants and Nod Factor Perception....Pages 267-268
Biogenesis of Peribacteroid Membrane (PBM) Forming a Subcellular Compartment Essential for Symbiotic Nitrogen Fixation....Pages 269-274
Characterization of GmENOD40, a Gene Expressed in Soybean Nodule Primordia....Pages 275-284
Expression of the Medicago Truncatula ENOD 12 Gene in Response to R. Meliloti Nod Factors and during Spontaneous Nodulation in Transgenic Alfalfa....Pages 285-290
Molecular Interactions during Nodule Development....Pages 291-296
Nodule Morphogenesis in the Absence of Rhizobium ....Pages 297-302
Ethylene and Nodulation....Pages 303-308
Differential Gene Expression in the Development of Actinorhizal Root Nodules....Pages 309-314
A Cyanobacterial-Plant Endosymbiosis: Aspects of Its Establishment....Pages 315-320
Potential Targets and Pathways for Rhizobium ’s Mitogenic Stimulus....Pages 321-326
Front Matter....Pages 381-381
Molecular Analysis of Components Responsible for Protection of Azotobacter Nitrogenase from Oxygen Damage....Pages 383-391
The Regulation of Oxygen and Its Role in Regulating Nodule Metabolism....Pages 393-398
 In Vivo and in Vitro Oxygen Control of Nitrogen Fixation Gene Expression in Rhizobium Meliloti ....Pages 399-403
Front Matter....Pages 381-381
Oxygen Sensing by the Rhizobium Meliloti Two-Component Regulatory System, Fixlj....Pages 405-410
Two Oxygen-Responsive Regulatory Cascades Control Nitrogen Fixation Genes in Bradyrhizobium Japonicum ....Pages 411-416
Heterocyst Differentiation and Nitrogen Fixation in the Cyanobacterium Anabaena ....Pages 417-422
Regulation of NifA Synthesis and Activity in Azospirillum Brasilense Sp7....Pages 423-427
The nifL Gene of Azotobacter vinelandii : Novel Features of Sequence, Expression and Mutant Phenotypes....Pages 429-434
A Maltose-Binding Protein-NIFA (MBP-NIFA) Fusion Activates Transcription from the Klebsiella Pneumoniae nifH Promoter in a Purified System: Stimulation by IHF....Pages 435-441
Front Matter....Pages 511-511
Carbon and Nitrogen Metabolism in Rhizobium ....Pages 513-516
Succinate Metabolism in Rhizobium Meliloti ....Pages 517-522
Diversion of Carbon to Polysaccharide Synthesis by Bradyrhizobium Japonicum and B . Elkanii Bacteroids....Pages 523-528
Molecular Control of Alfalfa Nodule NADH-glutamate Synthase: A Key for Nitrogen Assimilation....Pages 529-535
Front Matter....Pages 573-573
Rearrangement of nif Operons in Cyanobacterial Heterocysts....Pages 575-580
Gene Amplification in Rhizobium ....Pages 581-585
Molecular Phylogeny of Rhizobia and Their Relatives....Pages 587-592
Front Matter....Pages 665-665
The Prospects of Increasing the Input of Biological Nitrogen Fixation in Agriculture....Pages 667-670
Endophytic Diazotrophs in Sugar Cane, Cereals and Tuber Plants....Pages 671-676
Prospects and Problems of Biological Nitrogen Fixation in Rice Production: A Critical Assessment....Pages 677-682
Diversity of Photosynthetic Bradyrhizobium Strains from Stem Nodules of Aeschynomene Species....Pages 683-689
Capacities of Azoarcus Sp., a New Genus of Grass-Associated Diazotrophs....Pages 691-694
Field Testing of Genetically Engineered Rhizobia....Pages 695-701
Front Matter....Pages 757-757
Mechanism of Nitrogenase Catalysis....Pages 759-763
Front Matter....Pages 757-757
Extension of Nitrogen Fixation to Other Crops....Pages 765-768
Regeneration and Transformation of Legumes....Pages 769-772
Competitiveness of Rhizobium Strains for Nodule Occupancy....Pages 773-775
Report from the Taxonomy Meeting, Subcommittee on Agrobacterium and Rhizobium....Pages 777-778
Back Matter....Pages 779-790