Seed coat colour and proanthocyanadin depositions represented in the SK population. A) Variation in seed coat colour of selected SK mutant lines compared to wild type ecotypes Columbia (WTC), Wassilewskija (WS) and Landsberg (Ler) that are medium brown in colour and known transparent testa (tt) mutants (centre of image). B) Large panels show visible seed colour patterns. Small inserts show close ups of dark, DMACA-stained, streaked proanthocyanidin patterns in Col-4 and spotted or patchy patterns in two mutants. A third tan coloured mutant has even colouration overlaid with tan streaks.