The book begins with a chapter on Molecular Evolution and Phylogeny of mycorrhizas. Lucid discussions on cellular physiology, molecular genetics, and molecular regulation of nutrient exchange phenomenon in mycorrhizas form the core of this book. A comparative analysis of the molecular aspects of symbiosis and pathogenesis has been presented in detail. It also includes certain agriculturally useful aspects of disease control via mycorrhizas. Discussions on recent developments in molecular ecology of mycorrhizas, including most recently enunciated concepts such as ?nurse functions?, ?mycoheterotrophy? are provided in the book. Transformation, transgenics and genetic engineering of mycorrhizas is a unique and futuristic chapter. Applications of genetic engineering of mycorrhizas, as well as recently developed techniques of genetic transformation production of viable transgenic mycorrhizal fungi have been delineated. It will be useful to researchers/students involved in Microbiology, Molecular Biology, Plant Bio