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The mildew resistance of Hordeum bulbosum and its transference into H. vulgare genotypes

I. T. Jones, R. A. Pickering

Open publisher page 23 citations

Abstract

SUMMARY Mildew from susceptible genotypes (SI and S2) of Hordeum bulbosum was found to be avirulent on all H. vulgare genotypes tested, including such cultivars as Proctor with no known genes for resistance to mildew. The H. bulbosum genotype SI (2n =14) proved resistant to all isolates of mildew from H. vulgare. The mildew isolates used for these tests possessed most of the common virulence factors which attack the current ‘vulgare’ cultivars in Western Europe. Some H. bulbosum genotypes were resistant to the ‘bulbosum’ mildew. Attempts at combining resistance from both species are presented and discussed.

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SUMMARY Mildew from susceptible genotypes (SI and S2) of Hordeum bulbosum was found to be avirulent on all H. vulgare genotypes tested, including such cultivars as Proctor with no known genes for resistance to mildew. The H. bulbosum genotype SI (2n =14) proved resistant to all isolates of mildew from H. vulgare. The mildew isolates used for these tests possessed most of the common virulence factors which attack the current ‘vulgare’ cultivars in Western Europe. Some H. bulbosum genotypes were resistant to the ‘bulbosum’ mildew. Attempts at combining resistance from both species are presented and discussed.

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Available abstract

SUMMARY Mildew from susceptible genotypes (SI and S2) of Hordeum bulbosum was found to be avirulent on all H. vulgare genotypes tested, including such cultivars as Proctor with no known genes for resistance to mildew. The H. bulbosum genotype SI (2n =14) proved resistant to all isolates of mildew from H. vulgare. The mildew isolates used for these tests possessed most of the common virulence factors which attack the current ‘vulgare’ cultivars in Western Europe. Some H. bulbosum genotypes were resistant to the ‘bulbosum’ mildew. Attempts at combining resistance from both species are presented and discussed.

Key concepts: Mildew, Hordeum vulgare, Biology, Cultivar, Genotype, Virulence, Powdery mildew, Resistance (ecology)

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