The biochemical pathway of Chl degradation. The initial steps of Chl catabolism occur in the Chloroplast. pFCC and hydroxy-pFCC are released to the cytosol by unknown mechanisms. Additional modifications are catalyzed by the ER-localized CYP89A9 and the cytosol MES16. mFCCs and DFCCs are imported into the vacuole and converted into NCCs and DNCCs under acidic conditions. Heatmaps show relative expression values of each gene at indicated days after emergence (DAE) versus that at 16 DAE. A published dataset (GSE43616) is used for analysis (Woo et al. 2016). HM Chl a, 7-hydroxymethyl Chl a; Phein a, pheophytin a; Pheide a, pheophorbide a; RCC, red Chl catabolite; pFCC, primary FCC; mFCC, modified FCC; DFCC, dioxobilin-type (type-II) FCC; NCC: nonfluorescent Chl catabolite; DNCC: dioxobilin-type (type-II) NCC.