Plants survive in complex and competitive environments by producing an extraordinary array of secondary metabolites that protect, signal, and strengthen them under stress. Plant Secondary Metabolites in Ecological, Biochemical, and Agricultural Systems offers a comprehensive exploration of these powerful natural compounds and their multifaceted roles in plant defense, ecological interactions, and sustainable crop production. Bringing together cutting-edge scientific insights from plant biochemistry, ecology, and agriculture, this volume examines major classes of secondary metabolites, their biosynthesis, stress responses, ecological roles, and applications in modern farming. With the increasing demand for environmentally safe alternatives to synthetic agrochemicals, this book highlights how natural plant compounds can support pest management, improve crop resilience, enhance soil health, and reduce environmental impact. An essential reference for researchers, advanced students, agricultural professionals, and biotechnologists, this book provides timely knowledge and practical perspectives for developing future sustainable farming strategies grounded in nature's own defense mechanisms. Salient features: - Provides an in-depth understanding of how plant secondary metabolites support natural defense, stress tolerance, and ecological interactions. - Highlights eco-friendly, biologically grounded alternatives to synthetic pesticides, fertilizers, and growth regulators for sustainable agriculture. - Integrates biochemistry, ecology, molecular biology, and agricultural science to present a holistic perspective on plant defense systems. - Includes cutting-edge scientific advances in metabolic engineering, genomics, and biotechnology for enhancing crop protection and productivity. - Serves as a valuable reference for researchers, postgraduate students, biotechnologists, and agricultural professionals working toward sustainable farming solutions.