关键词: 玉米, 自交系, 种质资源, 玉米南方锈病, 抗性鉴定

Abstract: 【Objective】To study the resistance performance of maize inbred line germplasm resources to southern corn rust,and provide resistant materials for the breeding of maize varieties resistant to southern corn rust.【Methods】The resistance of 64 maize inbred line germplasm resources to southern corn rust was identified by means of natural infection in spring sowing and artificial inoculation in summer sowing.【Results】There were significant differences in the resistance of different maize inbred lines to southern corn rust,among 64 materials artificially inoculated,the control inbred lines Qi 319 and Qi 318 were identified as high resistance to southern corn rust,while Chang 7-2 and Zheng 58 were identified as high susceptible to southern corn rust. The inbred lines H025B and K4321 were identified as highly resistant to southern corn rust,while H0836,H0841,ZMD22,ZMD41,ZMD103,and ZMD622 were identified as resistant to southern corn rust. Among all the identified germplasms,the percentages of highly resistant and resistant materials were 6.25% and 9.38%,respectively,while high susceptible and susceptible materials were 42.19% and 23.44%,respectively. 【Conclusion】Among the 64 maize inbred lines germplasm resources,inbred lines H025B,K4321,H0836,H0841,ZMD22,ZMD41,ZMD103,and ZMD622 showed high resistance and resistance to southern corn rust;the germplasm resources of maize inbred lines are susceptible to southern corn rust,which is more severe and common in maize,and there is a lack of antigens. However,there were high resistance resources to southern corn rust in existing inbred line germplasm resources,which can provide important antigens for breeding disease resistant varieties.

Key words: Maize, Inbred line, Germplasm resource, Southern corn rust, Resistance identification