The term biotechnology refers to any technology, process or practice that modifies or harnesses any living organism or system to be useful to any human purpose. Plant biotechnology is essentially genetic engineering related to botanical science. Botany, branch of biology that deals with the study of plants, including their structure, properties, and biochemical processes. Also included are plant classification and the study of plant diseases and of interactions with the environment. The principles and findings of botany have provided the base for such applied sciences as agriculture, horticulture, and forestry. Modern biological systematics integrates a diverse array of disciplines ranging from molecular, cell and developmental biology, to ecology and evolutionary biology. Data-gathering techniques include DNA sequencing, protein electrophoresis, electron and light microscopy, controlled growth experiments, and field studies of ecology and distribution. The present book will be useful for the researchers to update their information on the topics dealt within this book. Book will be also useful to students, teachers, and, researchers in the field of biotechnology and plant biology. This book provides excellent glimpses on the current trends of plant biology.