"The Apoplast of Higher Plants: Compartment of Storage, Transport and Reactions" is a comprehensive technical book that focuses on the apoplast as the internal physiological environment of plants. It is considered crucial for maintaining homeostasis within plant bodies. The book summarizes the findings of a transdisciplinary research program that was funded by the German Research Foundation for six years. The authors, distinguished scientists from various disciplines such as physics, biochemistry, plant nutrition, botany, and molecular biology, present not only original research but also provide an overview of the current state of knowledge in their respective fields. Topics such as nutrient uptake, short and long-distance transport (xylem), tolerance to nutrient deficiency and mineral toxicity, as well as the role of microorganisms in the apoplast are discussed. Introductory remarks from internationally recognized scientists accompany each chapter, offering additional perspectives on the topics covered.