Effects of high temperature stress on lipid peroxidation and ascorbic acid content in apple leaves.

The AsA content and its redox state of apple leaves under different high temperature stress were studied to know response of AsA metabolism to high temperature stress.The results showed that the MDA and H2O2 content in apple leaves increased with the increase of high temperature treatment time,the total ascorbic acid and AsA content reached the highest under high temperature treatment for 2 h,and the AsA/DHA ratio decreased with the increase of high temperature treatment time.