Recent advances in science have clarified the role of plant specialized metabolites (classically known as plant secondary metabolites), which cannot be considered only bioactive molecules used for human health but also pivotal factors for the global ecosystem. They play major roles in plant life, evolution, and mutualism. To provide the reader a general view of plant specialized metabolites, it is important to consider both the biochemistry and the functional/ecological role of these important compounds.

Around 200,000 specialized metabolites are formed by a wide array of plant...