Azospirillum : genetics, physiology, ecology

Ten Years Azospirillum.- Genetic Analysis in Azospirillum.- Recent Developments in the Genetics of Nitrogen Fixation in Azospirillum.- Molecular Cloning of Nitrogen Fixation Genes from Azospirillum.- Site-Directed Transposon Mutagenesis of Cloned nif-Genes of Azospirillum brasilense.- Uptake and Fate of Plasmid-DNA in Azospirillum lipoferum A23.- Nif Mutants of Azospirillum brasilense: Evidence for a Nif a Type Regulation.- Mutants of Azospirillum Affected in Nitrogen Fixation and Auxin Production.- Motility Changes in Azospirillum lipoferum.- Attraction of Azospirillum lipoferum by Media from Wheat-Azospirillum Association.- Nitrogen Fixation and Denitrification by a Wheat-Azospirillum Association.- Effect of Oxygen Concentration on Electron Transport Components and Microaerobic Properties of Azospirillum brasilense.- Nitrogen Fixation (C2H2 -Reduction) and Growth of Pure and Mixed Cultures of Azospirillum lipoferum, Klebsiella and Enterobacter sp. From Cereal Roots in Liquid and Semisolid Media at Different Temperatures and Oxygen Concentrations.- Ecological Factors Affecting Survival and Activity of Azospirillum in the Rhizosphere.- Forage Grasses Inoculation with Gentamicine and Sulfaguanidine Resistant Mutants of Azospirillum brasilense.- Association between Wheat and Azospirillum lipoferum under Grenhouse Conditions: Increase of Yield and Thousand Corn Weight.- Benefits of Azospirillum Inoculation on Wheat: Effects on Root Development, Mineral Uptake, Nitrogen Fixation and Crop Yield.- Contribution of Azospirillum SPP. to Asymbiotic N2 -Fixation in Soils and on Roots of Plants Grown in Egypt.- Resume.- List of Participants.