苹果果实套袋对光合同化物积累与转化的影响

 通过建立一定的源库单位，分析富士苹果套双层纸袋后果实库中光合同化物的积累与转化代谢的动态变化。结果表明：套袋45 d（盛花后90 d）后，果实中光合同化物山梨醇的积累量明显高于未套袋的对照，但淀粉、葡萄糖、果糖、蔗糖含量低于对照；与糖转化代谢相关的蔗糖合酶（SS）、蔗糖磷酸合成酶（SPS）、酸性转化酶（AI）、山梨醇脱氢酶（SDH）和淀粉酶的活性均低于对照。套袋降低了果实的库活力，减弱了调运养分的能力。

Effects of Bagging on the Accumulation and Transformation of Photosynthates in Apple Fruits

The effects of bagging on the sink strength of Fuji apple fruit was studied in the same source-sink units established by girdling（the ratio of leaf number to a fruit was 40︰1）. The accumulation and metabolism of fruit carbohydrates were measured after bagging. The results showed that more sorbitol was accumulated in fruits 45 d after bagging than nonbagged fruits（control），but less starch，glucose，fructose and sucrose in bagged fruits. The activity of enzymes related to sugar metabolism such as sucrose synthase（SS），sucrose phosphate synthase（SPS），acid invertase（AI），sorbitol dehydrogenase（SDH）and amylase of bagged fruits was corresponded to decrease. The results indicated that metabolism of carbohydrates was inhibited in bagged fruits. It is suggested that sink vitality of fruits was declined by bagging.