摘要
Abstract
To clarify the effect of Rhopalosiphum maidis on the physiological characteristics of eight maize varieties and screen maize materials for resistance to Rhopalosiphum maidis.At the seedling stage,eight materials were artificially inoculated with Rhopalosiphum maidis,and chlorophyll content,superoxide dismutase(SOD),peroxidase(POD),catalase(CAT),proline(Pro),malondialdehyde(MDA),and soluble sugar(SS)content were determined.Meanwhile,the method of subordinate function was adopted to comprehensively analyze the test materials,and optimal regression equations were set up with stepwise regression analysis to filter out the indicators that were more remarkable for the different resistant maize in terms of the resistance to Rhopalosiphum maidis.The results showed that the chlorophyll a,chlorophyll b,and total chlorophyll contents of eight maize varieties were significantly reduced under the treatment of Rhopalosiphum maidis,while the contents of SOD,POD,CAT,Pro,MDA,and SS were increased to different degrees,and the insect resistance of the eight test materials was ranked in the order of strongest to weakest as Zhengdan 958＞Xianyu 335＞Ludan 6＞Ludan 6018＞Qidan 1＞Jidan 8＞Defa 705＞Dedan 123.In conclusion,all the Rhopalosiphum maidis treatments affected the physiological characteristics of the test maize.Zhengdan 958 and Xianyu 335 improved resistance to Rhopalosiphum maidis mainly by maintaining chlorophyll content and increasing antioxidant enzyme activity(SOD).Ludan 6,Ludan 6018,Qidan 1 and Jidan 8 mainly resisted Rhopalosiphum maidis by increasing osmoregulatory substances(SS).Defa 705 and Dedan 123 mainly alleviated Rhopalosiphum maidis damage by accumulating free proline.关键词
玉米/玉米蚜/苗期/抗性/生理响应Key words
Maize/Rhopalosiphum maidis/Seedling stage/Resistance/Physiological response分类
农业科技
