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Sodium para-aminosalicylate delays pericarp browning of litchi fruit by inhibiting ROS-mediated senescence during postharvest storage

Li, Taotao, Shi, Dingding, Wu, Qixian, Zhang, Zhengke, Qu, Hongxia, Jiang, Yueming
Food chemistry 2019 v.278 pp. 552-559
Litchi, carboxylic ester hydrolases, catalase, cell respiration, gamma-aminobutyric acid, genes, glutathione peroxidase, lipoxygenase, malondialdehyde, pericarp, postharvest storage, shelf life, sodium, superoxide dismutase
The effect of sodium para-aminosalicylate (PAS-Na) on litchi pericarp browning and the potential regulating mechanism was investigated in this study. Results showed that 0.3 g L−1 PAS-Na significantly inhibited the development of pericarp browning and reduced respiration rate of litchi fruit. PAS-Na inhibited the production of reactive oxygen species (ROS) and decreased the expression level of senescence-related genes. Additionally, PAS-Na treatment enhanced the activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX), which might contribute to the scavenging of ROS. Meanwhile, PAS-Na treatment maintained membrane integrity as indicated by reduced relative membrane leakage rate and malondialdehyde (MDA) content, as well as lower activities of membrane lipids-degrading enzymes: lipase and lipoxygenase (LOX). Amino acids, especially GABA, Glu, Met contents were also significantly affected by PAS-Na treatment. Taken together, we postulated that PAS-Na treatment might be a promising method for controlling postharvest browning and prolonging shelf-life of harvested litchi fruit.