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Geographical distribution and virulence phenotypes of Puccinia striiformis f. sp. tritici from wheat in Yunnan, China

文献类型： 外文期刊

作者： Gad, Mohamed A. 1 ; Li, Haoxing 3 ; Alam, Md Ashraful 1 ; Sajjad, Muhammad 5 ; Li, Mingju 1 ;

作者机构： 1.Yunnan Acad Agr Sci, Inst Agr Environm & Resources, Kunming 650205, Yunnan, Peoples R China

2.Agr Res Ctr, Plant Pathol Res Inst, Wheat Dis Res Dept, Giza 12619, Egypt

3.Huazhong Agr Univ, Coll Life Sci & Technol, Wuhan 430070, Hubei, Peoples R China

4.Bangladesh Wheat & Maize Res Inst, Dinajpur 5200, Bangladesh

5.COMSATS Univ Islamabad, Dept Biosci, Islamabad 45550, Pakistan

关键词： wheat; Puccinia striiformis; stripe rust; virulence; resistance gene

期刊名称：SCIENCEASIA （ 影响因子：0.615； 五年影响因子：0.708 ）

ISSN： 1513-1874

年卷期： 2019 年 45 卷 6 期

页码：

收录情况： SCI

摘要： Wheat stripe rust, caused by Puccinia striiformis is a widespread and destructive disease of wheat, causing significant losses in yield and quality. Survey of wheat stripe rust samples and identification of physiological races using Yr single-gene differential lines are very important in describing virulence pattern variation and geographical distribution of rust pathotypes. In the present study, a total of 86 races characterized from 125 stripe rust isolates were collected from Yunnan and Sichuan provinces of China during the 2017/2018 wheat growing season. The races v1 and v2 were widely distributed with virulence frequency of 8.8 and 8%, respectively. The remaining races have a lower frequency <= 3%. The 86 races clustered into two major virulence clusters: cluster-I comprised two races v29 and v30 and had relatively narrow virulence spectra, while cluster-II involved other 84 races and had broad virulence spectra. High virulence frequencies of Pst population (>73%) were detected for Yr1, Yr2, Yr6, Yr7, Yr8, Yr9, Yr11, Yr(17,29), Yr17, Yr18, Yr25, Yr26, Yr30, Yr32, YrA, YrSK, YrSP, YrSu, Yr(8,19), Yr(7,25), and Yr(10,Mor) genes. Moderate virulence frequencies of Pst population (16-73%) were observed for Yr3, Yr27, Yr(2,HVII), and Yr(7,22,23) genes. No isolate was detected to be virulent to Yr5 and Yr10 genes. The four genes Yr5, Yr10, Yr15, and Yr24 were regarded as effective genes. Therefore, monitoring distribution and frequency changes of virulence toward the Yr genes is important for cultivar selection with adequate resistance for growing in specific geographic regions and for developing new cultivars with durable and a high-level resistance.

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