Due to their diversity, vegetable Brassicas are of great economic import and offer unique opportunities to enrich our knowledge about plant growth, development, and rapid phenotypic evolution. By applying emerging genomic technologies, we may greatly increase our understanding of the Brassica biology and breeding efficiency. This volume contains 11 chapters contributed by 34 specialists with extensive experience in genetics, molecular breeding, and genomics of vegetable Brassicas. Recent achievements and new technologies presented in this book will provide support to further research the genetics and genomics of vegetable Brassica crops and facilitate their genetic improvement.