摘要： 树冠不同方位果实由于所处的微域环境不同，抗氧化特性有很大差异。生长季晴天，无论套袋与否，均以树冠西南面果实氧化胁迫程度最重。其中, O₂含量相当于树冠其他方位1.23~1.37倍；MDA含量相当于树冠其他树冠西南面果实氧化胁迫程度最重。其中，O₂方位1.32~1.75倍；SOD活性相当于树冠其他方位1.40~1.69倍。一般情况下，套袋后致使果实经受的环境胁迫程度加大, 因而果皮组织中O₂和MDA含量以及SOD活性都高于不套袋处理。由于套袋果实长期经受高温、弱光程度加大，因而果皮组织中O₂含量增加，SOD活性明显微域环境的驯化，除袋后果实对外界环境条件的剧烈变化较为敏感。表现为果皮组织O₂提高，表明果实中迅速启动了环境胁迫下的应急反应。

关键词: 套袋, 苹果, 果实, 抗氧化能力

Abstract: A considerable variation of antioxidative capabilities existed among the fruits from different exposures on a tree depending upon various microenvironments where they grow. In sunny and clear days during growing season, a severer oxidative stress frequently occurred on the fruits from the southwest exposure of the canopy, regardless of bagged or exposed fruits,with O₂ contents 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 O₂ and MDA contents and SOD activity in fruits increased, compared with the control. Furthermore,fruits became more sensitive shortly after bags were removed to harsh fluctuation of ambient temperatures and intense light because of the long-term adaptation to the ″relatively stable and dark environment″ within the bags, showing an abrupt rise of both O₂ content and SOD activity, which implied that a quick response to new stress had been initiated.

Key words: Bagging technique, Apple, Fruit, Antioxidative capability

中图分类号: 

• S661.01