I. Recognition in Nodulation by Rhizobium.- Genetic analysis of Rhizobium-plant interactions.- Respective roles of common and specific Rhizobium meliloti nod genes in the control of lucerne infection.- Infection mutants of Rhizobium meliloti are altered in acidic exopolysaccharide production.- Intercellular communication and recognition in the Rhizobium-legume symbiosis.- Promoters and operon structure of the nodulation region of the Rhizobium leguminosarum symbiosis plasmid pRL1JI.- Manipulation of nodulation specificity in the pea-Rhizobium leguminosarum symbiosis.- Bradyrhizobium japonicum genes involved in soybean root-nodule development.- Nodulation of soybean: Bradyrhizobium japonicum physiology and genetics.- Attachment of Rhizobium leguminosarum to pea root hair tips.- Specificity of Rhizobium(Galega) — Galega-interaction.- Flavones induce expression of the nodulation genes in Rhizobium.- Induction of Rhizobium nod genes by flavonoids: differential adaptation of promoter, nodD gene and inducers for various cross-inoculation groups.- Induction of Rhizobium leguminosarumnod genes by flavonoids is antagonized by other plant-specified aromatic compounds.- Fractionation of Rhizobium leguminosarum cells into outer membrane, cytoplasmic membrane, periplasmic and cytoplasmic components.- A study of surface interactions between Rhizobium bacteroids and the peribacteroid membrane using monoclonal antibodies.- Nodulins involved in early stages of pea root nodule development.- II. Recognition in Pathogen — Plant Interaction.- Pathogenic strategies of fungi.- The molecular basis of the Agrobacterium-plant interaction — Characteristics of Agrobacterium virulence genes and their possible occurrence in other plant-associated bacteria.- T-region transfer from Agrobacterium tumefaciens to plant cells: functional characterization of border repeats.- Cloning of DNA sequences from Azospirillum brasilense, homologous to Rhizobium nod genes and Agrobacterium vir genes.- Attachment of Agrobacterium tumefaciens to plant host cells.- Role of fimbriae and pili in the attachment of Klebsiella, Enterobacter and Pseudomonas to plant surfaces.- Race specific resistance to Bremia lactucae is expressed by lettuce cells in suspension culture.- Interaction of fungal polygalacturonase with plant proteins in relation to specificity and regulation of plant defense response.- A model system for the study of fungus — host surface interactions: adhesion of Phytophthora megasperma to protoplasts and mesophyll cells of soybean.- Ultrastructural studies of surface interactions during adhesion and infection by ericoid endomycorrhizal fungi.- Structural modifications of the fungal wall before and during VAM symbiosis.- III. Recognition in Plant Defence.- Occurrence of race-specific elicitors in the host pathogen interaction tomato-Cladosporium fulvum.- Studies on the role of carbohydrates in host-microbe interactions.- Biochemical interactions of plants with potentially pathogenic fungi.- Stimulation of phytoalexin formation in fungus-infected plants and elicitor-treated cell cultures of parsley.- Recognition and response in plant: pathogen interactions.- Phytoalexin synthesis in soybean following infection of roots with Phytophthora megasperma or treatment of cell cultures with fungal elicitor.- Elicitation of indole alkaloid biosynthesis in periwinkle.- Expression of plant genes in the hypersensitive reaction of French bean (Phaseolus vulgaris) to the plant pathogenic bacterium Pseudomonas syringae pv. phaseolicola.- Hydroxyproline-rich glycoproteins (HRGPs) in infected plants: signaling, accumulation and gene expression.- IV. Recognition in Biological Crop Pest Control.- A model genetically engineered pesticide: cloning and expression of the Bacillus thuringiensis subsp. Kurstaki—endotoxin into Pseudomonas fluorescens.- Molecular aspects of plant growth affecting Pseudomonas species.- The iron-uptake system of the plant-growth-stimulating Pseudomonas putida WCS358: genetic analysis and properties and structure analysis of its siderophore.- Role of flagella of the plant growth stimulating Pseudomonas fluorescens isolate WCS374 in the colonization of potato roots.- Conditions in the rhizosphere in relation to microbial development.- V. Recommendations for Future Research and Applications.- Consensus and perspective on Rhizobium.- Prospects for novel plant disease control rationales.- Plant-Agrobacterium interaction.- Recognition, elicitors and the hypersensitive reaction.- Molecular analysis of plant defence mechanisms.