A reference genome and its epigenetic landscape of potentialOrychophragmus violaceus, an industrial crop species

Orychophragmus violaceus , also called ‘er-yue-lan’ in China, is an annual plant of the family of Brassicaceae. The seed oil of O. violaceus contained two specific di-hydroxy fatty acids which were produced by functional divergence between two FAD2 WGD copies determine its industrial property. Here, we assembled a high-quality chromosome-level genome of O. violaceus via based on PacBio CLR technology and its cis-regulatory landscape of five mature tissues, including root, leaf, flower, seed and stem, based on ATAC-seq technology. 1.2 Gb draft genomic sequences were anchored to 12 pseudo-chromosomes and 49904 protein-coding genes were annotated on these chromosomes. To fully understand the epigenetic landscape of O. violaceus , we further performed WGBS-seq for leaf, flower and silique tissues. In total, our multi-omics data provide opportunity to find out the differences between two WGD copies and also a valuable resource for downstream breeding effort of this potential industrial species.