Fig. 8
From: Cold acclimation can specifically inhibit chlorophyll biosynthesis in young leaves of Pakchoi
The proposed model of chlorophyll biosynthesis in Y-05 under normal or low temperature. At normal temperature, the expression of BrFLU remains stable, and GLU converts to ALA to maintain normal biosynthesis of chlorophyll. Under low temperature, cold acclimation can trigger an unknown regulator, inducing BrFLU upregulation and the interaction between BrFLU and GLU-TR to block ALA synthesis, resulting in decreased chlorophyll content and leaf yellowing in Y-05. L-Glutamic acid, glutamyl-tRNA reductase, 5-Amino-levulinate and total chlorophyll were abbreviated as Glu, GluTR, ALA and Chl, respectively. Red and green arrow represents up-regulated and down-regulated of compounds, respectively