Survey and Evaluation on Race and Virulence Genes of Wheat Powdery Mildew Population

doi:10.7668/hbnxb.1996.02.008

Abstract

Abstract: During 1990-1993 a total of 364 isolates of Erysiphe graminis f. sp. tritici,collected from different areas in Henan Province, were identified for race with 9 differential hosts and analysed also for virulence genes. In race surveys,17 races that belonged to 5 race groups were found. The composition of races and their frequencies in mildew population changed quite greatly, the frequencies of race 1,10,11 and 15 had a decrease tendency,but the frequency of race 31 increased by a wide range,reached 20.75%in 1993. Virulence spectra of main race were also analysed. The results of virulence gene survey showed that the frequencies of V2,V2+6 and V8 changed widely. The merits and defects of two testing methods,and the improvement opinions were disscussed also in this paper.

Key words: Erysiphe graminis f. sp. tritici, Differential host, Race, Virulence gene

CLC Number:

S435.12

Wang Xifeng, Zhang Zhongshan, Liu Hongyan, He Jiabi. Survey and Evaluation on Race and Virulence Genes of Wheat Powdery Mildew Population[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1996, 11(2): 43-49. doi: 10.7668/hbnxb.1996.02.008.

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