Genetic Control of Primary Haustorial Development ofErysiphe graminison Wheat

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Abstract
Genes conferring resistance in wheat [Triticum aestivum] to E. graminis f. sp. tritici affect the ontogeny of early interactions between host and parasite. The rate of development of primary haustoria of E. graminis f. sp. tritici on 5 near-isogenic lines of wheat containing single genes for reactions to E. graminis (MS-1) was determined by direct microscopic observations made after fixation and staining of epidermal strips with aniline blue every 2 h from 8 through 30 h after inoculation. Inoculated plants were held under environmental conditions favoring development of the parasite. With the compatible Px/pmx genotype, 87% of the parasite units formed haustoria 35-55 .mu.m long within 30 h after inoculation. With the incompatible genotypes, Pla/Pmla, P2a/Pm2a, P3a/Pm3a and P4a/Pm4a, the percentages of haustoria 35-55 .mu.m long by 30 h after inoculation were 15, 66, 18 and 3, respectively. More than 75% of the host cells in the successful infections with Pla/Pmla, P2a/Pm2a, P3a/Pm3a and P4a/Pm4a, in which the haustoria were 35 .mu.m or more in length, were heavily stained, indicating mesophyll collapse and necrogenic protoplasts. The different genotypes affect different stages in the host/parasite interactions earlier than previously reported.

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