This study aimed to investigate the effect of exogenous oxalic acid treatment on the softening process of postharvest plum fruit. Fengtang plum was used as material, the fruits were soaked in 5 mmol/L oxalic acid (OA) solution for 10 min, and soaked in distilled water for 10 min as control (CK), and stored at room temperature (25±1) ℃ for 20 days. The changes of fruit firmness, cellulose, protopectin and soluble pectin contents, and the activities of polygalacturonase (PG), pectin methylesterase (PME), cellulase (Cx), β-galactosidase(β-Gal), xyloglucan endotransglucosylase (XET), and α-L-arabinofuranosidase (α-L-Af) were analyzed. Results indicated that exogenous OA treatment could maintain the higher firmness, delay the decline of protopectin and cellulose content and the increase in soluble pectin content, and inhibit the activities of PG, PME, Cx, β-Gal, α-L-Af, and XET in fruits. The fruit firmness was significantly correlated with the content of protopectin, cellulase, and soluble pectin contents, and also correlated with the activities of Cx, β-Gal, XET, and α-L-Af, there was no significant correlation with PME activity (P>0.05). The protopectin and cellulase contents were significantly negatively correlated with the activities of Cx, β-Gal, XET, and α-L-Af. The soluble pectin content was significantly positively correlated with the activities of PG and PME. In conclusion, exogenous OA could delay the softening process of postharvest plum fruits by inhibiting the activity of cell wall degradation enzymes and reducing the degradation of cell wall components, thus prolonging the storage time.
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