title: Antioxidant enzymes and fatty acid composition as related to disease resistance in postharvest loquat fruit.
abstract: Two cultivars of loquat fruit were stored at 20°C for 10days to investigate the relationship between disease resistance, and fatty acid composition and activities of endogenous antioxidant enzymes. The results showed that decay incidence increased with storage time in both cultivars. A significantly lower disease incidence was observed in 'Qingzhong' fruit than in 'Fuyang', suggesting 'Qingzhong' had increased disease resistance. Meanwhile, 'Qingzhong' fruit also had lower levels of superoxide radical and hydrogen peroxide, and lower lipoxygenase activity, but higher levels of linolenic and linoleic acids and higher activities of catalase (CAT) and ascorbate peroxidase (APX) compared with 'Fuyang'. These results suggest that the higher levels of linolenic and linoleic acids and the higher activity of CAT and APX have a role in disease resistance of postharvest loquat fruit.
authors.affiliation: Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture, Liuying 100, Nanjing 210014, PR China; College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, Jiangsu, PR China.
authors.forename: Shifeng
authors.initials: S
authors.lastname: Cao
authors.affiliation: College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo 315100, PR China.
authors.forename: Zhenfeng
authors.initials: Z
authors.lastname: Yang
authors.affiliation: College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, Jiangsu, PR China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Cai
authors.affiliation: College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, Jiangsu, PR China. Electronic address: zhengyh@njau.edu.cn.
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Zheng
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D002374:Catalase / Q000032:analysis; D060467:Disease Resistance; D031983:Eriobotrya / Q000737:chemistry* / Q000201:enzymology; D005227:Fatty Acids / Q000032:analysis*; D061353:Food Storage; D005638:Fruit / Q000737:chemistry
chemical_list: D000975:Antioxidants; D005227:Fatty Acids; D002374:Catalase
keywords: Antioxidant enzyme; Disease resistance; Fatty acid; Loquat fruit