Effects of High Temperature and Waterlogging Stress on Cellulase Activity of Non-heading Chinese Cabbage

Two non-heading Chinese cabbage varieties 'Heiyoudong' and 'Suzhouqing' were used as materials to study the effects of high temperature and waterlogging stress on the activities of enzymes related to cellulose synthesis in non-heading Chinese cabbage. The two varieties had different resistance to high temperature and waterlogging. Three temperature gradients of 24℃, 35℃ and 40℃ were set, and each temperature was set two treatments, waterlogging and non-waterlogging. The results showed that under high temperature stress, the CesA, SS, and KOR enzyme activities of 'Heiyoudong' and 'Suzhouqing' showed a trend of first increasing and then decreasing, while the trend of CE enzyme activity was opposite. Under the combined stress of high temperature and waterlogging, the changed trend of the enzyme activities related to cellulose synthesis in 'Heiyoudong' and 'Suzhouqing' is similar to that of a single high temperature stress, but the degree of impact is greater than that of a single high temperature stress. In addition, regardless of high temperature stress, high temperature and waterlogging combined stress, the increase in CesA, SS, and KOR activities in 'Heiyoudong' was greater than that of 'Suzhouqing', but the decrease was less than that of 'Suzhouqing'; The increase in CE activity of 'Suzhouqing' is less than that of 'Suzhouqing', but the decrease rate is greater than that of 'Suzhouqing'.