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Ecology and Epidemiology

Alternate Hosts of Puccinia hordei. Y. Anikster, Senior lecturer, Faculty of Life Sciences, Tel-Aviv University, Tel-Aviv, Israel 69978; Phytopathology 72:733-735. Accepted for publication 18 September 1981. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-733.

Accessions of native Liliaceae species, Ornithogalum brachystachys, O. trichophyllum, Dipcadi erythraeum, and Leopoldia eburnea support formation of pycnia and aecia of Puccinia hordei when inoculated with cultures isolated from cultivated barley or each of the native wild barleys, Hordeum spontaneum, H. bulbosum, and H. murinum. Solitary pycnia on each of the alternate hosts produced aecia when intermixed with nectar from another pycnium formed on any one of the mentioned Liliaceae species. Aeciospores infected only the Hordeum species that was the source of teliospores for inoculation of the alternate host, except that reciprocal inoculations of H. spontaneum and H. vulgare were successful. In contrast, regardless of their origin, the monokaryotic stages are pathogenically less specialized and have common host in O. brachystachys, O. trichophyllum, D. erythraeum, and L. eburnea. Rust cultures from each of the alternate hosts inoculated with a common collection of teliospores, showed similar spectra of virulence on seedlings of H. vulgare endowed with different specific genes for resistance to brown leaf rust.