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Petal color is an important agronomic trait in cabbage ( Brassica oleracea L. var. capitata ). Although the key gene BoCCD4 has been functionally characterized, the underlying molecular regulatory mechanism of petal color formation in cabbage is still unclear. In this study, we applied the transcriptome analysis of yellow petals from the cabbage inbred line YL-1 and white petals from the Chinese kale inbred line A192-1 and the BoCCD4 -overexpressing transgenic line YF-2 (YL-1 background), which revealed 1928 DEGs common to both the A192-1 vs. YL-1 and the YL-1 vs. YF-2 comparison groups. One key enzyme-encoding gene, BoAAO3 , and two key TF-encoding genes, Bo2g151880 (WRKY) and Bo3g024180 (SBP), related to carotenoid biosynthesis were significantly up-regulated in both the A192-1 and YF-2 petals, which was consistent with the expression pattern of BoCCD4 . We speculate that these key genes may interact with BoCCD4 to jointly regulate carotenoid biosynthesis in cabbage petals. This study provides new insights into the molecular regulatory mechanism underlying petal color formation in cabbage.