Cold Resistance and Physiological Indexes of Different Apricot Cultivars

Dormant branches and flower branches of one-year-old ’Jinmeixing’’Kate’’Jidanxing’’Jintaiyang’ were taken as test materials.Through different low-temperature treatments,the membrane permeability,protective enzyme activity and osmotic adjustment substances were measured.Comparing changes in physiological indicators at low temperatures,as well as the relationship with cold resistance.Analyzing the correlation between various indicators,in order to provide reference for selecting new cold resistant cultivar.The results showed that with the decrease of temperature,the changes of the relative conductivity of branches,MDA content in branches,the content of proline in branches,MDA content in flowers and the content of proline in flowers showed an upward trend.The changes of SOD activity in branches and flowers showed a trend of rising first and then decreasing.MDA content in branches of ’Kate’ was significantly different from that of the other three cultivars.The content of proline in the branches of ’Jintaiyang’ was significantly different from that of the other three cultivars.MDA content in flowers was negatively correlated with the cold resistance of four apricot cultivars.Except for ’Jidanxing’,the proline content in the branches was positively correlated with cold resistance.Relative conductivity was significantly positively correlated with SOD activity in branches,proline content in branches,and MDA content in flowers,and was significantly negatively correlated with proline content in flowers.MDA content in flowers was significantly negatively correlated with SOD activity in flowers and proline content in flowers.SOD activity in flowers was significantly positively correlated with proline content in flowers.The order of the cold resistance of the four apricot cultivars was ’Jintaiyang’＞’Jinmeixing’＞’Jidanxing’＞’Kate’.