Parasitic Specialization ofPuccinia hordeiin Israel

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Abstract
Alternate host Ornithogalum spp. are important in the perennation of P. hordei in Israel. The racial identity of 615 isolates from Hordeum spontaneum and 447 isolates from plants of Ornithogalum spp. was determined. The isolates were collected from plants growing in the wild in 6 regions during 3-4 yr in succesion. The results suggest that isolates from the alternate host were parasitically more diverse than those from the main host. Populations from both sources had 17 virulence patterns in common; 5 patterns were present only on the alternate host and one was limited to the main host. Some virulence patterns were particularly common each year in all regions. A number of isolates from the main and alternate host rendered ineffective all known genes from specific resistance [in H. vulgare] including Pa7 (in cultivar Cebada Capa), Pa3 (in cultivar Estate), and Pa9 (in USDA CI 1243).