A SCARECROW-RETINOBLASTOMA Protein Network Controls Protective Quiescence in the Arabidopsis Root Stem Cell Organizer
Figure 4
A modified RBR-SCR network in the QC.
(A) pCycD6::GUS:GFP expression in QC of pSCR::SCRAxCxA:YFP, scr-4 background. (B) Down-regulation of RBR in the pSCR domain in pSCR::amiGORBR fails to induce pCycD6 transcription in the QC. (C) pSCR::SCRAxCxA:YFP does not recover QC division in scr-4, shr-2 background. (D) pCycD6::GUS:GFP expression upon SHR induction in pSHR::SHR:GR, shr-2 background only in ground tissue and not in QC cells. (E) pCycD6::GUS:GFP expression in pSCR::IAAH line, treated with IAAM; note induction in endodermis but not in QC. (F) Auxin accumulation does not induce CycD6 transcription in the QC.