Haustorium Formation byPuccinia hordeiin Leaves of Hypersensitive, Partially Resistant, and Nonhost Plant Genotypes

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Abstract
In barley [Hordeum vulgare] genotypes with early acting hypersensitivity or with partial resistance and in nonhost species like wheat [Triticum aestivum], a large proportion of the colonies of P. hordei aborted after the formation of the 1st infection hyphae and a few haustorial mother cells. The early abortion without collapse of plant cells was associated with a failure in the formation of haustoria. This was particularly evident in partially resistant barley. Early abortion with host cell necrosis occurred after the formation of the 1st haustorium. This type of abortion was important in barley with the early acting Pa3 gene for hypersensitivity. In nonhost wheat, most of the infection units aborted before the formation of the 1st haustorium.