Figure 8.

Model of anterograde and retrograde signaling during early steps of chloroplast biogenesis in wild-type and pap7-1 mutants. Light signals (flash) are perceived by PRs (orange circle). Small white ovals represent undifferentiated proteoplasts present in seeds. Large ovals in green and white represent the different plastid types in wild-type (CP) and pap7-1 (AAP) seedlings. Gray-shaded arrows indicate the developmental process leading to these plastid types. Boxes indicate and name the genes or gene modules regulated during these processes. Thin black arrows represent positive regulation; lines with a blocking bar represent negative regulation. WT, wild type.