It is now known that over 90 percent of all plants have established integrative plant-fungal processes in their root systems, and it may well turn out to be the case that virtually all plants have mycorrhizae. In this work, many of the best researchers in the field review the current status of research in plant-fungal communications, mycorrhizal organisms, applications, and biotechnology. The focus is a hierarchical one. This volume is comprehensive and covers both ectomycorrhizae and vesicular-arbuscular (VA) mycorrhizae, addressing concepts that are related to all the different groups. Mycorrhizal Functioning will be of interest to professionals and graduate students in microbiology, ecology, mycology, plant pathology, plant science, and soil science. Those working in the agricultural biotechnology industry will also benefit from the book's applications perspective.