Genetic linkage maps of the wild carrot parent QAL and cultivated parent B493. Microsatellites mapped in this work are denoted in red. Carotenoid biosynthesis genes  and Dc MTD markers  are denoted in blue and green letters, respectively. Codominant markers present in both QAL and 493 maps are underlined. B493-map positions for significant QTL for root total carotenes (displaying 95% support intervals) in LG5 (former LG2) and LG7 (former LG5), were estimated based on data published previously [7, 58], and represented by yellow circles. LGs were ordered and named according to their corresponding physical chromosomes .