关键词: 菜用甘薯, 低温锻炼, 耐寒性, 生理特性

Abstract:

Using Fucaishu 18, a vegetable sweet potato variety, as the material, it was treated for 24, 48, and 72 hours at 15 °C and 12 °C, respectively, before applying a low-temperature stress treatment at 8 °C/5 °C. 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.

Key words: Vegetable sweet potato, Low-temperature acclimation, Cold tolerance, Physiological characteristics