Response of 5 Leaf-Vegetable Sweet Potato Varieties to Low Temperature Stress and Evaluation of Cold Tolerance
In order to screen cold resistance identification indicators for vegetable sweet potatoes,and establish a mathemat-ical evaluation model for cold resistance to provide a basis for the identification and screening of cold resistant vegetable sweet potato resources,five varieties of vegetable sweet potato were subjected to conduct 8 days low temperature stress ex-periments under the conditions of 8.1-14.7℃,average temperature 10.9℃and 12h/12h day and night.Leaf SPAD val-ue,membrane lipid peroxidation index,membrane protection system and cell osmotic regulator were determined at 0,2,4,6 and 8 d after treatment,respectively.Subsequently,principal component analysis,membership functions,and stepwise re-gression methods were used for comprehensive evaluation of cold resistance.The results showed that there were some diffe-rences in the change trend of physical and chemical indexes among different varieties under low temperature stress.The cold tolerance of five vegetable sweet potato varieties showed the trend of Fucaishu 23>Fushu 7-6>Shulyu No.1>C9>Fu-caishu 18.The mathematical model PV(predicted value)of cold tolerance evaluation of vegetable sweet potato was estab-lished,and the estimation accuracy was more than 90%.Pro,SOD,POD and PS can be used as indicators for cold tolerance identification of vegetable sweet potatoes.
vegetable sweet potatolow temperature stressphysiological characteristicscold tolerance identification
万方数据
维普
