Fig. 4. KNAT1 functions in SAM maintenance. (A-C) 8-day old whole seedlings of (A) wild type, with early vegetative leaves emerging, (B) the single stm-1 mutant and (C) the triple as1 stm-1 bp mutant. Both mutants have two cotyledons fused at the base and lack a vegetative shoot. (D- F) Longitudinal sections. (D) Wild type, showing dense staining cells of the SAM and young leaf primordia at the base of the cotyledons. At the base of the fused cotyledons in stm-1 (E) and as1 stm-1 bp (F) these cells are not found.
