Summary
Four cultures of Puccinia hordei isolated from the alternate Ornithogalum hosts in Israel were virulent on seedlings of barley cultivars carrying resistance genes Pa, Pa2, Pa2 + Pa5, Pa2 + Pa6, Pa3, Pa4, and Pa7. Cultures with such a spectrum of virulence have never been reported. The cultures remained stable through 20 successive inoculation and isolation cycles. One of the cultures, T-40SS, retained its specific virulence after selfing on the alternate host. The evolution of virulent races of obligate parasites in the centers of origin of their hosts is discussed.
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Golan, T., Anikster, Y., Moseman, J.G. et al. A new virulent strain of Puccinia hordei . Euphytica 27, 185–189 (1978). https://doi.org/10.1007/BF00039134
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DOI: https://doi.org/10.1007/BF00039134