Regulation of E4 and SlMsrB2 by TF NOR. A, Expression levels of E4 and SlMsrB2 genes in the fruits of nor mutant, NOR, and NOR-M138Q overexpressing in nor lines at 55 dpa. B, The binding activities of NOR or NOR-M138Q with the promoters of E4 and SlMsrB2. C, The transcription activities of E4 and SlMsrB2 genes by NOR or NOR-M138Q. Each value represents the mean ± se of six biological replicates. Different letters above the bars indicated statistically significant differences between the samples (Student’s t test; P < 0.01).