苜蓿蓟马抗性与生理活性相关性研究

目的]通过蓟马危害不同程度后各项生理指标的综合变化与危害程度间相关分析，探讨不同苜蓿品系的抗性强弱。方法]通过不同数量蓟马对不同抗性紫花苜蓿危害的多个有关抗性生理指标（POD、SOD、PPO、PAL、CAT活性及MDA和游离脯氨酸含量）变化的研究，来探讨各项生理指标与抗性间的关系。结果]蓟马危害数量与苜蓿POD、SOD、PPO、PAL活性及MDA和游离脯氨酸含量成正相关，与CAT活性成负相关。高抗苜蓿品系POD、SOD、PP0、CAT活性及MDA和游离脯氨酸含量变化速率慢，PAL活性变化快，并且PPO、PAL、CAT活性水平高，而POD、SOD活性水平低。结论]研究为紫花苜蓿抗蓟马品系鉴定提供了理论依据和材料。

Correlation Study of Medicago sativa Resistance to Thrips and Physiological Activity

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.