Presents molecular mechanisms involved from meristem to organ formation and focuses on basic scientific problems such as cell division and differentiation, organogenesis and development. This book is the outcome of the research results of the Plant Cell Differentiation and Organogenesis - Innovation Group of the National Natural Science Foundation of China (NSFC). The book introduces theories, research progress and research methods with the help of illustrations and refined structures. The book is intended for postgraduate and undergraduate students of botany, and research scholars in related fields.