Abstract: The effect of relative humidity on membrane functions in fruit peel tissues was examined with　Fuji apples. The results showed that under high-temperature stress, LOX activity and membrane leakage decreased but 5^'-nucleotidase activity increased as environmental relative humidity rose. Moreover, a significant difference was found between 30% and 50% relative humidity treatments in membrane function of peel tissues. In hot weather when fruit sunburn is likely to happen,enhancing the relative humidity in an orchard could be beneficial to raise the antioxidative capability in fruit peel tissues, hence improving fruit resistance to heat.

Key words: High-temperature stress, Relative humidity, Apple, Fruit peel, Enzyme

CLC Number: 

• S661.1