Fig. 4: Changes of the signaling molecules and the ripening-related parameters under melatonin treatments.

ABA (a), H2O2 (b), ethylene release rate (c) and the ripening-related parameters (d) were determined in 2017. The berries were treated two times at 46 and 53 DAB. The ripening-related parameters included TSS, anthocyanin, and titratable acid (d). FW fresh weight, DW dry weight. Values represent the mean ± SD of three replicates, and each replication contained 240 berries, which were randomly sampled from the middle of the clusters of 10 vines. The differences are not significant at the 5% significance level among the values with the same small letter at the same DAB in (d)