Yr5-virulent races of Puccinia striiformis f.sp.tritici possess relative parasitic fitness higher than current main predominant races and potential risk  

作　　者：Gensheng Zhang Mudi Sun Xinyao Ma Wei Liu Zhimin Du Zhensheng Kang Jie Zhao 

机构地区：[1]State Key Laboratory of Crop Resistance and High-Efficiency Production,College of Plant Protection,Northwest A&F University,Yangling 712100,China

出　　处：《Journal of Integrative Agriculture》2024年第8期2674-2685,共12页农业科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(32072358 and 32272507);the National Key R&D Program of China(2021YFD1401000);the earmarked fund for CARS-03,the Natural Science Basic Research Project in Shaanxi Province of China(2020JZ-15);National“111 Project”of China(BP0719026)。

摘　　要：Wheat stripe rust,caused by Puccinia striiformis f.sp.tritici(Pst),is one of the most destructive fungal diseases of wheat,and seriously threatens safe production of the crop worldwide.In China,new races historically appeared and rapidly developed to be predominant races and have resulted in ineffectiveness and replacement of wheat resistance cultivars as well as massive reduction in yield.In the present study,the relative parasitic fitness of the two newlyemerged Yr5-virulent races(TSA-6 and TSA-9)were compared with those of four currently predominant Chinese races(CYR31,CYR32,CYR33,and CYR34)based on evaluation on 10 Chinese wheat cultivars.As a result,there were significant differences in the relative parasitic fitness parameters among overall tested races based on multiple comparison(LSD)analysis(P<0.05).The principal component analysis(PCA)of overall parasitic fitness parameters indicated that the sporulation ability,infection and spore survivability,expansion capacity,and potential pathogenicity were the most important parasitic fitness attributes of the tested races.Based on the establishment of extracted three principal components and a comprehensive factor score mathematical models,evaluations of the parasitic fitness attributes of tested races showed that the level of relative parasitic fitness of the tested six races was:CYR32(1.15)>TSA-9(0.95)>TSA-6(0.92)>CYR34(0.29)>CYR31(–1.54)>CYR33(–1.77).The results indicated that two Yr5-virulent races TSA-9 and TSA-6 possessed relative parasitic fitness higher than races CYR34,CYR31,and CYR33,but lower than race CYR32,and have potential risks in developing to be predominant races.Therefore,continual monitoring of both Yr5-virulent races,and their variants is needed.The use of wheat cultivars(lines)with Yr5 resistance gene singly in wheat breeding is essential for being avoided,and is suggested to combine with other effective stripe rust resistance genes.

关 键 词：wheat stripe rust Puccinia striiformis f.sp.tritici parasitic fitness Yr5 new race 

分 类 号：S435.121.42[农业科学—农业昆虫与害虫防治]