Evaluation And Appraisal On Freezing-tolerance Of Lady Godiva Pumpkin

Pumpkin(Cucurbita moschata)is bryony, pumpkin is a one-year-old vine herbs, an important one of the specialty vegetables of China. The heat-resistant pumpkin, better cold tolerance,as often grafted rootstock increase plant resistance. At present the pumpkin and other vegetables on the study of more heat-resistant, but in the cold resistance of less research, and in the appropriate temperature in cold hardiness of identification or a blank. To that end this experiment on the selected bare-1, nude Renhe big grain farmers on the 1st green line on the identification of the main findings are as follows:1. Through the pilot found, in low-temperature stress pumpkin leaves electrolyte leakage rate and increase the content of MDA, SOD, POD, CAT, such as the protection of significant changes in the activity of. soluble protein, soluble sugar content of the relative increase in the relative increase in proline. Pumpkin seedling cold damage index with temperature and prolonged rise in stress, these indicators of change and pumpkin varieties of cold resistance consistent performance, pumpkin varieties can be used as identification of the cold hardiness of indicators.2. Compared found through experiments, in 10℃/ 5℃(d / n) deal with the conditions under low temperature stress, various indicators to reflect the changes in the pumpkin varieties of cold resistance of difference, can be used as the appropriate temperature low temperature.3. By measuring MDA, protection of activity and infiltration of substances such as resistance to physiological indicators, leaves found electrolyte leakage and increase the content of MDA,SOD,POD,CAT such as the protection of significant changes in the activity . Cold injury index with low temperature stress and extend up, however, different species of different rate of change, pumpkin show that different species of cold resistance there was a significant difference. And through its membership function computing, bare-proved stronger on the 1st of cold resistance, the tablets of bare-times, green on the 1st cold hardiness of poor farmers.4. Several varieties of pumpkin through the cold hardiness of the identification of comparison, naked from the screened-strong varieties of cold resistance on the 1st, can promote the cultivation.