Plant genetics and breeding has been widely practiced to develop innovative breeding methodologies and discover important genes and varieties. The text focuses upon theoretical and conceptual practices that bridge the gap between fundamental researches and their implementation in plant breeding. This book discusses the variations in plant DNAs and how such aspects can be utilized for breeding a superior quality of plants and crops. It also delves into phytopathology and disease management in plants. It brings forth revolutionary researches in the discipline from across the globe. It will be helpful to researches, experts and interested readers in this field.