2015-2023年1406份大豆品种(系)对大豆疫霉的抗性评价OA北大核心

[Objectives]The aim of this study was to evaluate and analyze the resistance to Phytophthora sojae for 1 406 soybean varieties(lines)collected since the implementation of the National Soybean Variety Research Project for nine years(2015-2023).[Methods]Using eight representative P.sojae isolates which showed different virulence,the etiolated hypocotyl-slit inoculation method was used for indoor inoculation.The resistance type to a single isolate and the comprehensive resistance level to multiple isolates were determined based on the established evaluation criteria.[Results]The proportion of tested soybean varieties(lines)exhibiting resistance or moderate resistance to different isolates was between 18.8%and 96.7%,with the least number(167)of varieties(lines)to the highly virulent isolate PsJS2.The average comprehensive resistance level of all varieties(lines)gradually increased from 1.9(below moderate resistance)in 2015 to 3.2(above moderate resistance)in 2023,and the proportion of varieties(lines)with comprehensive resistance levels 3-5(above moderate resistance)increased from 32.6%to 66.8%.Among the 357 varieties(lines)with a comprehensive resistance level of 4-5(from resistance to high resistance),there were more than 15 varieties(lines)each in 7 series including Zhongzuo,Jidou,Shengdou,Zhonghuang,Andou,Handou and Zheng.Among the 105 varieties(lines)with a comprehensive resistance level of 5(high resistance),there were more than 5 varieties(lines)each in 11 series including Jidou,Zhonghuang,Zhoudou,Zhongzuo,Shengdou,Andou,Handou,Zheng,Xudou,Shangdou and Cangdou.[Conclusions]During 2015 and 2023,the resistance level of tested soybean varieties(lines)to P.sojae had shown a gradually increasing trend.The results had provided a reference for the breeding and application of soybean varieties resistant to Phytophthora root rot.