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Purple leaves are rich in health-protecting anthocyanins and food colorants in Brassica juncea. But the causal gene, which is related to leaf color formation, have not been reported in B. juncea. Anthocyanins mainly accumulated throughout the adaxial and abaxial epidermal leaf cells of purple leaves. A genetic analysis indicated that an incompletely dominant gene controls the purple leaf trait in B. juncea. Furthermore, the BjPur gene, which increased anthocyanin accumulation in purple-leaf mustard, was cloned. Blast and phylogenetic analyses revealed that