Plant Biotechnology and Development is the first of a series of publications designed to provide readers with an overview of current topics in plant molecular biology

Preface. DNA Amplification Fingerprinting and its Potential Application for Genome Analysis (Brant J. Bassam, Gustavo Caetano-Anollés, and Peter M. Gresshoff). The Plant Molybdenum Cofactor (Moco) (Ralf R. Mendel). Motility and Chemotaxis in the Life of Rhizobia (Wolfgang D. Bauer). Distinct Entities between Soybean Agglutinin Receptor and Soybean Root Hair Binding Site on Bradyrhizobium japonicum Cell Surface (Siu-Cheong Ho). Rhizobium Lipopolysaccharides; Their Structures and Evidence for Their Importance in the Nitrogen-Fixing Symbiotic Infection of Their Host Legumes (Russell W. Carlson, U. Ramadas Bhat, and Brad Reuhs). Molecular Signaling in the Bradyrhizobium japonicum-Soybean Symbiosis (Gary Stacey). Cytokinins and Legume Nodulation (Barbara J. Taller). Nodulation in the Absence of Rhizobium (Gustavo Caetano-Anollés, Priyavadan A. Joshi, and Peter M. Gresshoff). Altered Tryptophan Biosynthesis in Bradyrhizobium japonicum Gives Enhanced Nodulation and Nitrogen Fixation (L. David Kuykendall and William J. Hunter). Alfalfa Nodule Development; Ribonucleotide Pools and Ribonucleotide Reductase Activity in Cultured and Symbiotic Rhizobium meliloti (J.R. Cowles and S.F. Yet). Systemic Regulation of Nodulation in Legumes (Peter M. Gresshoff and Gustavo Caetano-Anollés). RFLP Linkage Analysis of Symbiotic Mutants of Soybean (Deborah Landau-Ellis, Randy Shoemaker, Sieglinde Angermüller, and Peter M. Gresshoff). Physical Mapping of the nts Region of the Soybean Genome Using Pulse Field Gel Electrophoresis (PFGE) (Roel P. Funke and Peter M. Gresshoff). Gene Transfer to Barley (R.R. Mendell, E. Clauss, J. Schulze, H.H. Steinbiß, and A. Nerlich). Application of Molecular Analyses to Questions Relating to the Genetics, Ecology and Evolution of Actinorhizal Symbioses (Beth C. Mullin, Susan M. Swenson, Paul Twigg, and Paula Goetting-Minesky). Intracellular Receptor Proteins for Calcium Signals in Plants (Daniel M. Roberts, C. David Weaver, and Suk-Heung Oh). Pathogen and Pes