Effects of Low Temperature Acclimation Duration on Cold Tolerance Physiological Characteristics in Vegetable Sweet Potato Seedlings
Using Fucaishu 18,a vegetable sweet potato variety,as the material,it was treated for 24,48,and 72 hours at 15 ℃ and 12 ℃,respectively,before applying a low-temperature stress treatment at 8 ℃/5 ℃.The physiological characteristics of antioxidant enzymes,osmotic mediators,membrane lipid peroxidation,and cold resistance were determined after stress 0,24,48,and 72 h after stress,as well as the restoration of room temperature 48,48,and 48 h again low-temperature stress.These data were used to examine the effects of various low-temperature acclimation times on the cold tolerance of sweet potatoes.The results showed that with the extension of the low-temperature stress time,the SOD and POD activities of the low-temperature acclimation leaves gradually increased.Although the contents of soluble protein and soluble sugar fluctuated,the change range was relatively smoother than CK.During the low-temperature stress period,the MDA content of each low-temperature acclimation treatment was gradually decreased,and CK gradually increased with the extension of the stressed time.It was observed that there was a significant interaction between low-temperature acclimation and low-temperature stress,and that the two factors jointly induced an improvement in cold resistance.The analysis showed that there was a significant interaction between low temperature exercise and low temperature stress,and cold tolerance jointly induced the improvement of cold tolerance under the piecewise interaction of the two factors.
万方数据
维普
