This book provides a comprehensive examination of the current knowledge available regarding signal molecules in plant-microbe communications. It also provides many experimental details regarding the characterization of the signal compounds and the genes affected by these molecules. Specific topics addressed include signal communication from bacteria to parasitic angiosperms, genes involved in signal perception and transduction, and the methods used to characterize many signal molecules. The book will prove useful not only in research in microbiology/plant pathology, molecular biology, and rhizosphere studies, but will serve as a tool in designing specific strategies to control harmful interactions while developing useful ones. This book is invaluable for researchers in plant biotechnology.