Response of physiologic metabolism and cell structures in mango fruit to exogenous methyl salicylate under low-temperature stress

We explored the effects of exogenous methyl salicylate (MeSA) on the development of chilling injury symptom, and the structure and composition of the pericarp, in mango ( Mangifera indica L. cv. 'Red 6') fruit under low-temperature stress using histochemical analysis and scanning electron microscopy together with Fourier transform infrared (FTIR) analysis. The results indicated that chilling injury symptom was remarkably limited in the fruit treated with MeSA at 0.1 m M as compared to the 5°C control, demonstrating the positive effects of MeSA in reducing chilling injury of mango fruit in low-temperature storage. In MeSA-treated fruit, the pericarp wax surface showed many cracks, and exocarp cells exhibited normal separation. The cell wall of exocarp contained lower amounts of pectic substances, aliphatics and phenolics in MeSA-treated fruit. In addition, MeSA-treated fruit contained more esterified substances and less carboxylate and carboxyl substances. Our work revealed the importance of MeSA in enhancing fruit tolerance to low-temperature stress and suggested a contribution of cellular structure and composition to this effect, which has not been reported previously.