Transgene technology since its inception, about two decades ago, has progressed rapidly providing platform for discovery, product design and novel plants which are improved source of food, feed, chemicals and drugs. This knowledge is changing rapidly by which plants develop their architecture to survive, abiotic and biotic stress, and become resistant to herbicides, pests and pathogens. Also the scene is set for a change from traditional farming to molecular farming. Moreover, gene silencing from a bane has turned out to be a boon, opening new vistas in genetic engineering of crop plants. In this book one can find an up-to-date account of aims and achievements of genetic engineering of crop plants. This book will useful for the undergraduate students of Botany, Biotechnology and Agriculture.