Plant microbiology is a branch of microbiology that studies the benefits of microorganisms found in the soil. Soil microorganisms provide nutrients, improve soil structure and reduce soil erosion. Some of the microorganisms present in the soil are protozoa, actinomycetes, fungi and bacteria. Fungi like mycorrhiza form a mutualistic relationship with the roots of plants and provide constant access to nutrients like glucose, sucrose, iron, etc. This book discusses the fundamentals as well as modern approaches of plant microbiology. It strives to provide a fair idea about this discipline and to help develop a better understanding of the latest advances within this field. Students, researchers, experts and all associated with plant microbiology will benefit alike from this book.