期刊
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
卷 99, 期 8, 页码 3824-3833出版社
WILEY
DOI: 10.1002/jsfa.9604
关键词
sweet potato; chilling injury; reactive oxygen species (ROS); antioxidant enzymes; antioxidant metabolites
资金
- earmarked fund for the China Agriculture Research System [CARS-10-B1]
- Fundamental Research Funds for the Central Universities [JZ2018HGTB0241]
- National Natural Science Foundation of China [31670278, 31470013, 31300133]
- Major Projects of Science and Technology in Anhui Province [16030701073]
BACKGROUND Sweet potato is susceptible to chilling injury during low-temperature storage. To explore the correlation between chilling injury and reactive oxygen species (ROS) metabolism, the content of ROS and the activities and gene expression of antioxidant enzymes were analyzed in the typical storage-tolerant cultivar Xushu 32 and storage-sensitive cultivar Yanshu 25. RESULTS The activities of antioxidant enzymes including ascorbate peroxidase (APX), superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR) were enhanced rapidly in the early period of storage in response to chilling stress. Thereafter, the content of ROS metabolites increased consistently due to gradual decrease in ROS scavenging enzymes. Storage-tolerant cultivar Xushu 32 had higher antioxidant enzyme activities and gene expressions as well as higher content of antioxidant metabolites and lower content of ROS metabolites compared with storage-sensitive cultivar Yanshu 25, suggesting that the capacity of ROS scavenging by antioxidant enzymes and antioxidants is highly associated with the tolerance of sweet potato to chilling stress. CONCLUSION These results indicated that the antioxidative system is activated in the storage root of sweet potato and the antioxidative capacity is positively associated with better storage performance in the storage-tolerant cultivar. (c) 2019 Society of Chemical Industry
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