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Race specific resistance and cultivar specific virulence in the barley leaf rust pathosystem and their consequences for the breeding of leaf rust puccinia hordei resistant barley hordeum vulgare



Race specific resistance and cultivar specific virulence in the barley leaf rust pathosystem and their consequences for the breeding of leaf rust puccinia hordei resistant barley hordeum vulgare



Euphytica 32(2): 367-376



A range of leaf rust isolates was tested on a series of barley cultivars among the differential series. No resistance to all isolates seems to exist in the cultivated barley. The barley cultivars appear to carry zero to 2 race-specific resistance (Pa) genes. The isolates carry from 3-8 virulence factors from the 8 or 9 that could be evaluated. Isolates with wide virulence spectra were most common. The pattern with virulence to Pa, Pa2, Pa4, Pa5, Pa6 and Pa8, and avirulence to Pa3, Pa7 and Pa9 is very common and seems to have a near-global distribution. These isolates are not necessarily identical in genotype. Partial resistance and race-specific resistance appear independently of one another in the various cultivars. The increased interest in breeding for race-specific resistance in this host-pathogen system is on the long term considered a wrong strategy as it will considerably hamper the selection for partial resistance. This resistance is readily available in commercial cultivars and can protect barley from leaf rust damage in most situations.

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