苜蓿蓟马抗性与生理活性相关性研究

1材料与方法1．1试材与试验地概况供试材料为现蕾期的草原2号紫花苜蓿、敖汉苜蓿、阿尔冈金苜蓿及自选抗蓟马新品系紫花苜蓿。试验地设置在呼和浩特内蒙古农业大学科技园区牧草试验站内种植3年的人工草地。该地位于东经111°48’，北纬40°48’，海拔1063m，属于典型大陆性气候，日气温最高和最低分别为36．9℃和-33℃，年均气温5．4℃，≥10℃年积温2915℃，年平均降水量350-400mm，主要集中在7-9月，无霜期135d：

Study on Physiological Activity of the Resistance of Medicago sativa to Thrips

Objective] The experiment explored of resistance of different Medicago sativa through synthetic variations of all physiological indexes and the correlation analysis between physiological activity and damage degree after thrips damage. Method] According to studying physiological activity (POD activity, SOD activity, PPO activity, PAL activity, MDA content and free proline content) of alfalfa in alfalfa resistance to different number of thrips, the correlation between physiological activity and resistance was investigated. Result] It was shown that there were negative correlations among POD, SOD, PPO, PAL, MDA, free praline and the number of thrips, and there were negative correlations among POD, SOD, PPO, PAL, MDA, free praline and CAT. The content changes of POD,SOD,PPO,CAT,MDA and free proline in high resistant alfalfa were slow and PAL was quick and the activities of PPO,PAL,CAT were high, and the activities of POD、SOD were low. Conclusion] The research provided theoretical basis and materials for identifying resistance varieties of alfalfa to thrip.