Explores examples of microorganisms and their sometimes unexpected effects on plants. Contents include: Genetic basis for broad host range in rhizobia; Xanthomonas avr/pth family; Hypovirulence; Oxidative burst; Role of suppressors in plant pathogenesis; Identification of plant genes involved in plant-microbe interactions; Iron and Biocontrol; and Transcriptional regulation of plant genes responsive to pathogens and elicitors.