Race composition of Blumeria graminis (DC) Speer f. sp. tritici in the south of Ukraine and effectiveness of Pm-genes in 2004–2013

Babayants, O.V. and Babayants, L.T. and Traskovetskaya, V.A. and Gorash, A.F. and Saulyak, N.I. and Galaev, A.V. (2015) Race composition of Blumeria graminis (DC) Speer f. sp. tritici in the south of Ukraine and effectiveness of Pm-genes in 2004–2013. Cereal Research Communications, 43 (3). pp. 449-458. ISSN 0133-3720

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Abstract

The virulence frequency of 750 wheat powdery mildew isolates of wheat genotypes, carrying 23 Pm-genes and gene combinations, was studied over ten consecutive years from 2004 to 2013. Seventy-eight previously known and 39 new pathotypes were identified during this period. The results indicate that the majority of Pm-genes have high level of virulence. Sixty to ninety percent of the isolates were virulent to Pm6, Pm8, Pm8+11, Pm2+4b+8, Pm3g, Pm10+15, Pm10+14+15. The virulence frequency was variable for Pm1a, Pm2, Pm3a, Pm3b, Pm3c, Pm5, Pm7 genes and reached high level in certain years. The virulence frequency to genes Pm20, Pm37, Pm4a+ and to gene combination with Pm3c+5a+35 and breeding lines CN240/06, CN98/06 and CN158/06 ranged from 1 to 8%. Bread wheat lines CN240/06, CN98/06 and CN158/06, derived from interspecific crosses, proved to be highly resistant to powdery mildew.

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