Plant cells regulate all the vital processes occurring inside the plant. They cause cellular responses to external stimuli and determine the structure, growth and life cycle of the plant. Cells contain valuable evidence about the environment and the ecology that sustains the plant. Research in this field concerns with processes like phytoremediation, biofortification, etc. This book outlines the principles of plant cell biology. New technologies related to the field of plant breeding have been covered in it as well. It is an essential guide for both academicians and those who wish to pursue this discipline further.