This book is the first comprehensive compilation of deliberations on elucidation and augmentation of the genome of Brassica juncea , one of the leading oilseed crops of the world, popularly called as brown mustard, Indian mustard, Chinese mustard, or Oriental mustard. It includes discussions on genepools; genetic diversity and its characterization; classical genetic and traditional breeding; basics and application of heteroploidy; techniques and applications of introgressive hybridization; in vitro culture for micro-propagation, somatic mutation, somatic embryogenesis, and somatic hybridization; genetic engineering including genetic transformation and gene silencing; and molecular genetic mapping and mapping of genes and comprehensive delineations on genome sequencing and comparative genomics; resequencing for elucidation of origin and diversity; large-scale genome analysis; plastid genome sequence; transcriptomics; metabolomics; proteomics; evolutionary genomics; role of regulatory genes in development and adaptation and their utilization in trait improvement; precise breeding for yield, quality, and resistance to biotic and abiotic stresses; and prospects of genome editing.