A Method for Field Evaluation of Wheats for Low Receptivity to Infection byPuccinia graminisf. sp.tritici

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Abstract
Uredospores of P. graminis f. sp. tritici in light mineral oil were applied uniformly with a portable mist blower to a linear arrangement of rows of susceptible wheat [Triticum aestivum] accessions. Large differences in amounts of primary infection caused by uniform inoculations with race 15B-2 were consistently detected between the highly receptive wheat line Purdue 5481C1 and the less receptive cultivars ''Thatcher'', ''Sentry'' and ''Idaed 59''. Receptivity changed from high to low with increasing age in ''Thatcher'' and ''Sentry'', and from low before anthesis to high afterwards on leaf blades of ''Idaed 59''. Primary uredia were larger on juvenile plants than on older plants of ''Marquis'', ''Lee'', ''Thatcher'', ''Sentry'' and ''Idaed 59'', but were consistently large on Purdue 5481C1. Low receptivity in ''Idaed 59'' apparently is goverened by a single dominant gene linked or identical to Sr Ti-l, and in ''Thatcher'' by 2 recessive complementary genes. ''Lee'' apparently had a 3rd recessive gene for low receptivity that reacts cumulatively with the two complementary genes in Thatcher to yield lines of very low receptivity.

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