Plant Microbiome: Rhizosphere, Endosphere, Phyllosphere, Environment, Plant Immunity and Plant–Microbiome Interactions

The present book provides a comprehensive examination of the diverse microbial communities associated with plants and their vital roles in plant growth, health, immunity, environmental adaptation, and sustainable agriculture. The book explores the rhizosphere, rhizoplane, endosphere, and phyllosphere as distinct yet interconnected microbial habitats in which bacteria, fungi, nematodes, protozoa, epiphytes, and endophytes interact continuously with their plant hosts. Beginning with an evolutionary and ecological perspective, the volume explains the diversity, composition, assembly, and functional characteristics of plant-associated microbiota. It examines how environmental conditions, plant species, agricultural practices, root exudates, and chemical signalling influence microbial colonization and community structure. Particular attention is given to the complex communication between plants and microorganisms and the ways in which these interactions affect nutrient acquisition, metabolism, stress tolerance, disease resistance, and overall plant development. The book offers a detailed discussion of plant immunity and demonstrates how beneficial microorganisms can strengthen plant defence mechanisms against pathogens and adverse environmental conditions. It also highlights the importance of plant growth-promoting rhizobacteria, microbial inoculants, and engineered plant–microbe interactions in improving crop productivity and resistance to biotic and abiotic stresses. Traditional methods of characterizing plant microbiota are discussed alongside modern approaches for investigating microbiome diversity, functions, and community dynamics. The concepts of core and satellite microbiomes, microbial establishment, nutrient release and absorption, and microbiome engineering are presented in relation to their practical agricultural applications. By connecting microbiology, plant science, biotechnology, ecology, and environmental studies, this book demonstrates the growing importance of microbiome-based technologies in reducing dependence on chemical fertilizers and pesticides. It will be a valuable resource for students, researchers, teachers, agricultural scientists, microbiologists, biotechnologists, environmentalists, and professionals interested in plant health, crop improvement, ecological balance, and long-term agricultural sustainability.