Abstract: A considerable variation of antioxidative capabilities existed among the fruits from different exposures on atree depending upon various microenvironments where they grow. In sunny and clear days during growing season, a severeroxidative stress frequently occurred on the fruits from the southwest exposure of the canopy, regardless of bagged or exposedfruits, with ₂contents in SW fruits being 1. 23- 1. 37 folds as high as those on the other exposures, MDA 1. 32- 1. 75 folds and SOD 1. 40- 1. 69 folds. Generally, bagging could aggravate the extent of fruit stress, thus both ₂and MDA contents and SOD activity in fruits increased, compared with the control. Furthermore, fruits became more sensitiveshortly after bags were removed to harsh fluctuat ion of ambient temperatures and intense light because of the long-termadaptation to the / relatively stable and dark environment0 within the bags, showing an abrupt rise of both ₂

Key words: Bagging technique, Apple, Fruit, Antioxidat ive capability

CLC Number: 

• S661.1