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Yr5-virulent races of Puccinia striiformis *** possess relative parasitic fitness higher than current main predominant races and potential risk

引用

Journal of Integrative Agriculture 2024年第8期23卷 2674-2685页

作者： Gensheng Zhang Mudi Sun Xinyao Ma Wei Liu Zhimin Du Zhensheng Kang Jie Zhao State Key Laboratory of Crop Resistance and High-Efficiency Production College of Plant ProtectionNorthwest A&F UniversityYangling 712100China

Wheat stripe rust,caused by Puccinia striiformis ***(Pst),is one of the most destructive fungal diseases of wheat,and seriously threatens safe production of the crop *** 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 *** 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 *** a result,there were significant differences in the relative parasitic fitness parameters among overall tested races based on multiple comparison(LSD)analysis(Praces 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 ***,continual monitoring of both Yr5-virulent races,and their variants is *** 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

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