Azospirillum-Plant Associations presents the most significant information from the vast body of scientific work that has accumulated as a result of nearly two decades of intensive research. It emphasizes advances that have occurred over the last six years, covering such topics as plant growth promotion, recognition and elicitation of plant responses by bacteria and the inoculant industry, the metabolism of production of plant growth promoting substances (phytohormones), and aerotaxis and poly-ß-hydroxybutyrate metabolism. This interdisciplinary volume is an excellent reference for agricultural microbiologists and biotechnologists, plant physiologists, geneticists, microbiologists, and agronomists.