Fig. 1. Phenotype, genetic map, and identification of candidate BrPur genes in purple head Chinese cabbage.

a 94S17 was the female parent of 11S91, with a white head. b 95T2-5, a purple flowering Chinese cabbage, was the male parent. c 11S91, with stable inheritance of purple head leaves, was bred from the hybridization of 94S17 and 95T2-5 and continuous self-breeding. d 14S162 was the female parent used for creating the mapping population. e Selected individuals of the F₂ population formed by crossing 14S162 and 11S91. f Genetic map of BrPur based on fine mapping with markers QJ-46 (0.1 cM) and SSR14-36 (0.6 cM). g Physical map showing the candidate region of the BrPur locus, which was delimited to a 10.93 kb region on chromosome A07, with four predicted genes between markers QJ-46 and LY-2. The scale bar is 10 cm in (a–d)