Figure 4

Single-repeat R3 MYB transcription factors function redundantly to control trichome formation on pedicels, siliques and cotyledons. (A) Comparison of pedicle trichomes in the tcl1 single mutant (left) and the cpc etc1 etc3 triple mutant (right). Shown are pedicles of the first flowers on the main inflorescence stems. Arrow heads indicate trichomes on both ends of pedicels in cpc etc1 etc3 triple mutant. (B) Ectopic trichome formation on siliques of the try cpc etc1 tcl1 quadruple mutant. No trichomes were formed in the siliques of wild-type plants. (C) Ectopic trichome formation on cotyledons of the try cpc etc1 etc3 tcl1 quintuple mutant. No trichomes were formed in the cotyledons of wild-type seedlings. Picture was taken from a 5-day-old, light-grown seedling.