The relationship between senescence and Ca2+-ATPase activity of microsomal membrane and lipid peroxidation in postharvest peach fruits
Guan Jun Feng, FanXiu Cai, DouShi Juan, ZhangJi Shu, and LiGuang Min
Abstracts of 27th International Horticultural Congress & Exhibition (IHC 2006), August 13-19, 2006, COEX (Convention & Exhibition), Seoul, Korea. 494 pages.
2006
บทคัดย่อ
Peach (Prunus persica sieb et Zucc) cultivars generally fruit soften rapidly, within a few days of harvest if maintained at ambient temperature.In this study, measurement of Ca2+-ATPase activity of microsomal membrane and lipid peroxidation was used to investigate their correlation with postharvest senescence in the peach cultivar ‘Yingging’ when maintained at high (25°C) or low (4°C).Fruit stored at 4°C were firmer, had lower rates of respiration and ethylene production had those stored at 25°C ; they also generated a higher and late peak ofCa2+-ATPase activity that was maintained thereafter; this was concomitant with a lower ratio of super oxygen radical (O2-) production to malondialdehyde (MDA) content, a product of membrane lipid peroxidation.The Ca2+-ATPase inhibitors, sodium orthovanadate (SO) and Erythrosin B (EB), increased respiration rate, but only had a slight effect on ethylene production.It suggested that the slow rate of senescence at 4°C was closely related to the higher peak value and longer duration of high Ca2+-ATPase activity in microsomal membranes, together with the lower membrane lipid peroxidation and O2- production rates in cold stored peach fruits.