Quantum dots (QDs) are important in the research and industrial fields due to their diverse properties and technological importance. Recently, QDs have been found to be suitable for biological, biomedical, agricultural, and food science applications. Many research articles, review papers, and internet sources have published on the use of QDs to improve plant growth and yield, but a comprehensive overview in book form has not been available to date. This book provides detailed information on synthesis, functionalization, and the use of various types of quantum dots for plant systems. It also addresses the current state of knowledge on sensing mechanisms of QD-based biosensors used for microorganisms, including bacteria, fungi, and plant virus detection. This book also offers in-depth knowledge related to QDs used for plant growth, nutrients, and plant protection from micro-organisms. This volume is beneficial as one comprehensive resource for students, researchers, scientists, technicians, academicians, and industrialists.