Figure 1.

Auxin biosynthesis and transport are epigenetically regulated along the plant life cycle. (a–h) Epigenetic regulation of (a–e) auxin-biosynthesis-related genes and (f–i) auxin-transport-related genes. Colored ovals represent proteins of the epigenetic machinery: chromatin remodelers (red), Polycomb and other histone modifiers (green), DNA methylation/demethylation enzymes (grey), histone chaperones (yellow), and noncoding RNAs (pink). Pale orange rectangles indicate transcription factors. Proteins promoting gene activation are represented above the gene, whereas factors drawn below represent repressors. Distances to the regulated gene are not drawn to scale.