Book excerpt: This third book in the three-volume Plant Secondary Metabolites examines the relationship between environmental stress and the physiology of plants, leading to stimulation of secondary metabolites. Various stressors are discussed, including plant and soil interfaces, changing climate elements, essential plant nutrients, pest insects, plant pathogens and microrganisms, and more. The chapters, written by experienced experts, also address the diverse utilization of plant-originated secondary metabolites and more.