PMPP provides an international forum for original research papers, reviews, and commentaries on all aspects of the molecular biology, biochemistry, physiology, ultrastructure, genetics and evolution of plant-microbe interactions. Papers on all kinds of infective pathogen, including viruses, prokaryotes, fungi, and nematodes, as well as mutualistic organisms such as Rhizobium and mycorrhyzal fungi, are acceptable as long as they have a bearing on the interaction between microbe and plant.