Respiratory activity and mitochondrial membrane associated with fruit senescence in postharvest peaches in response to UV-C treatment.
The effect of 3.0kJ/m(2) ultraviolet-C (UV-C) treatment on respiratory activity and mitochondrial membrane associated with fruit senescence in peach fruit stored at 20°C for 8days was investigated. UV-C treatment could reduce senescence development, as evidenced by higher fruit firmness due to inhibition of respiration rate via reducing succinic dehydrogenase and cytochrome C oxidase activity. Meanwhile, the activities of superoxide dismutase, catalase and ascorbate peroxidase in the UV-C-treated fruit were much higher than those in control fruit, resulting in lower levels of superoxide radicals (O2(-)) and hydrogen peroxide (H2O2). In addition, this treatment maintained a higher level of mitochondrial membrane fluidity and inhibited opening of mitochondrial permeability transition pore. Our results suggest that the induction of antioxidant enzymes to scavenge O2(-) and H2O2 by UV-C treatment was associated with the maintenance of mitochondrial membrane integrity, which also played an important role in senescence retardation in peach fruit.
College of Biological and Environmental Sciences, Key Laboratory of Fruits and Vegetables Postharvest and Processing Technology Research of Zhejiang Province, Zhejiang Wanli University, Ningbo 315100, People's Republic of China; Key Laboratory of Plant Resource Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.
Zhenfeng
Z
Yang
Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture, Liuying 100, Nanjing 210014, People's Republic of China.
Shifeng
S
Cao
Guangdong Food and Drug Vocational College, Guanzhou 510520, People's Republic of China.
Xinguo
X
Su
Key Laboratory of Plant Resource Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China. Electronic address: ymjiang@scbg.ac.cn.
Yueming
Y
Jiang
D000375:Aging; D000975:Antioxidants; D005638:Fruit / Q000737:chemistry*; D051336:Mitochondrial Membranes; D027861:Prunus / Q000737:chemistry*; D013482:Superoxide Dismutase; D013481:Superoxides; D014466:Ultraviolet Rays
D000975:Antioxidants; D013481:Superoxides; D013482:Superoxide Dismutase
Mitochondrial membrane; Peach; Respiratory activity; Senescence