Summary
A range of leaf rust (Puccinia hordei) isolates was tested on a series of barley cultivars among which the differential series. No resistance to all isolates seems to exist in the cultivated barley. The barley cultivars appear to carry zero to two race-specific resistance (Pa) genes. The isolates carry from three to eight virulence factors from the eight or nine 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, however are not necessarily identical in genotype.
Partial resistance and race-specific resistance appear idependently of one another in the various cultivars.
The increased interest for breeding for race-specific resistance in this host-pahtogen system is on the long term considered a wrong strategy as it will considerably hamper the selection for partical resistance. This resistance is readily available in commercial cultivars and can protect barley from leaf rust damage in most situations.
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Parlevliet, J.E. Race-specific resistance and cultivar-specific virulence in the barley-leaf rust pathosystem and their consequences for the breeding of leaf rust resistant barley. Euphytica 32, 367–375 (1983). https://doi.org/10.1007/BF00021445
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DOI: https://doi.org/10.1007/BF00021445