Abstract: Southern corn rust resistance of corn varieties participating in regional trials and introduced variety registration trials in Henan Province from 2021 to 2024 was evaluated using a combination of field nurseries and artificial inoculation. Additionally，resistance gene detection was conducted on varieties exhibiting moderate resistance or higher levels in 2023 and 2024，to determine the resistance status of newly bred corn varieties to southern corn rust，and provide a  theoretical basis for breeding and promoting resistant corn cultivars.The results showed that 134，121，87，and 119 corn varieties were tested in the Henan regional trials from 2021 to 2024，respectively.Among them，the proportions of varieties showing moderate or higher resistance to southern corn rust were 36.57%，92.57%，57.47%，and 86.55%，respectively.For the introduced variety registration trials，68，82，43，and 14 corn varieties were tested，and the proportions of varieties showing moderate or higher resistance to southern corn rust were 32.35%，95.12%，51.16%，and 71.43%，respectively，demonstrating a generally consistent trend.However，there were notable year‑to‑year variations in the proportion of resistant and susceptible varieties.In years with southern corn rust epidemics，such as 2021 and 2023，the proportion of resistant varieties was relatively lower.In 2023，resistance genes were detected in varieties showing moderate resistance or higher levels.The results showed that 48.61% of these varieties carried the resistance gene RppC，while RppM was not detected in any of the tested varieties.Furthermore，51.39% of the varieties lacked both RppC and RppM.In 2024，detection of RppC，RppM，and RppK genes in varieties showing moderate resistance or higher levels was conducted.The results showed that RppC had the highest detection ratio of 92.92%，followed by RppK and RppM with the detection ratio of 21.24% and 20.35%，respectively.However，three varieties tested were negative for all three resistance genes.In conclusion，a relatively high proportion of corn varieties evaluated in recent years in Henan Province exhibited resistance to southern corn rust，with an overall increasing trend.The resistance gene RppC continues to play a key role in corn production，while RppK and RppM are beginning to be applied in southern corn rust‑resistant breeding.Further exploration and utilization of additional resistance genes are still needed.

Key words: Corn, Southern corn rust, Resistance evaluation, Disease?resistant varieties, Gene detection

摘要： 利用田间病圃结合人工接种方法，对2021—2024年河南省区域试验和引种备案试验参试玉米品种进行了南方锈病的抗性鉴定与评价，同时对2023、2024年达到中抗以上水平的参试玉米品种进行抗性基因检测，明确新育玉米品种对南方锈病的抗性，为玉米抗锈品种选育和推广提供理论依据。结果表明，2021—2024年河南省区域试验参试品种分别有134、121、87、119份，其中对南方锈病表现中抗及以上的品种分别占比36.57%、92.57%、57.47%、86.55%；引种备案试验参试玉米品种分别有68、82、43、14份，其中对南方锈病表现中抗及以上的品种分别占比32.35%、95.12%、51.16%、71.43%，趋势基本一致。不同年度之间抗感类型品种比例差异明显，玉米南方锈病大流行年份2021年和2023年参试品种对南方锈病表现抗性的类型比例较低。2023年对达到中抗以上水平的参试玉米品种中抗锈基因RppC和RppM携带情况进行检测，发现48.61%的抗性类型品种含有RppC基因，但未检测到RppM基因，另有51.39%品种均未检测到RppC或RppM基因；2024年对达到中抗以上水平的参试玉米品种中抗锈基因RppC、RppM和RppK携带情况进行检测，发现Rppc基因检出率达92.92%，RppK和RppM基因检出率分别为21.24%和20.35%，但仍有3个品种没有检测到这3个抗锈基因的任何一种。综上，近年河南省玉米区试及引种备案参试品种中对南方锈病表现抗性品种占比较高，而且整体上呈逐年增加趋势。抗锈基因RppC在玉米生产上仍然发挥重要作用，同时RppK和RppM抗锈基因也开始在玉米抗锈育种中得到一定程度的应用，但尚需进一步挖掘利用其他抗病基因。

关键词: 玉米, 南方锈病, 抗性鉴定, 抗病品种, 基因检测