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Effect of nano-ZnO-packaging on chilling tolerance and pectin metabolism of peaches during cold storage

Li, Dong, Li, Li, Luo, Zisheng, Lu, Hongyan, Yue, Yang
Scientia horticulturae 2017 v.225 pp. 128-133
beta-galactosidase, carbon dioxide, cell walls, chilling injury, cold storage, cold stress, cold tolerance, electrolytes, fruit quality, gels, metabolism, oxygen, peaches, pectinesterase, pectins, polyethylene, polygalacturonase, viscosity
The effects of nano-ZnO-based low-density polyethylene (NZLDPE)-packaging on chilling tolerance and pectin metabolism in postharvest “Hujingmilu” peaches were investigated. Peaches packed in low-density polyethylene (LDPE) and NZLDPE were stored at 2°C for 40d. Compared with the control, both packages alleviated the development of chilling injury, showed higher fruit firmness with lower browning index, electrolyte leakage, relative viscosity, and decay rate. NZLDPE-packaging performed better than LDPE-packaging because of the rapid formation of low O2 and high CO2. Moreover, NZLDPE-packaging inhibited pectin esterase and enhanced polygalacturonase and β-galactosidase, leading to the promotion of alkali soluble-pectin and water-soluble pectin, and the decrease of chelater-soluble pectin. These effects were of great benefit to the maintaining of cell wall structure and the degradation of calcium-pectate gel, which finally alleviated the chilling injury and therefore maintained good quality during chilling stress.