Mimicking Met-138 sulfoxidation in NOR suppresses tomato fruit ripening. A, Fruit ripening phenotype of nor mutant, NOR, and NOR-M138Q overexpressing in nor lines. Fruit at 45, 50, 55, 60, and 70 dpa from the three genotypes are shown. B to D, The changes in lycopene content (B), ethylene production rate (C), and total chlorophyll content (D) of the three genotypes during fruit ripening. Each value represents the mean ± se of three biological replicates. Different letters above the bars indicated statistically significant differences between the samples (Student’s t test; P < 0.01).