In this study, South China 5 cassava slices were sprayed with water and methyl jasmonate (MeJA) to study the effects of MeJA on reactive oxygen species, antioxidant enzymes, quality, endogenous hormone levels, and melatonin biosynthesis genes. We found that exogenous MeJA could delay the deterioration rate for at least 36 h and alleviate cell oxidative damage through activation of superoxide dismutase, catalase, and peroxidase. Moreover, MeJA increased the concentrations of melatonin and gibberellin during PPD, which had a significant effect on regulating PPD. Notably, exogenous MeJA had a significant effect on maintaining cassava quality, as evidenced by increased ascorbic acid content and carotenoid content. Taken together, MeJA treatment is an effective and promising way to maintain a long postharvest life, alleviate cell oxidative damage, and regulate storage quality in cassava.
Figure 3: The modulation of MeJA treatment on antioxidant enzyme activities in cassava tuberous roots during PPD. Related activities of catalase (CAT) (A), peroxidase (POD) (B), and superoxide dismutase (SOD) (C) in cassava tuberous roots. Data are means ± SD calculated from at least four biological replicate samples. Asterisk symbols (*) indicate significant differences according to Duncan’s multiple range test at p < 0.05 at the same time.