Fig. 5

The allelic variation of HtMYB2 in natural population. a The difference in the promoter region of HtMYB2. The sequence in the box indicates that 21 bp was inserted into the promoter of QY3. White, gray and black boxes were the three active regions of promoters predicted by BDPG software (Table S3). The gray box only existed in the promoter of QY1. Arrow shows the site of specific primer HtproS. b The electrophoresis of PCR production of partial materials with the diagnostic primers HtproS. The target strips of purple varieties were 103 bp, and the white varieties were 124 bp