Reduced Receptivity to Infection Associated with Wheat GeneLr2cfor Low Reaction toPuccinia recondita

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Abstract
Tests were made to determine if Lr genes in wheat (Triticum aestivum) influenced the number of uredinia produced by virulent cultures of P. recondita. Near-isogenic wheat lines, having genes Lr1, Lr2c or Lr3a singly or in various combinations, and their recurrent parent were compared for receptivity to infection. Virulent cultures produced as many uredinia with lines having Lr1 or Lr3a as with their recurrent parents. Wheat lines having Lr2c produced fewer uredinia than their recurrent parents when inoculated with some virulent cultures, but not when inoculated with other virulent cultures. Preliminary test results revealed differences between lines having Lr2c and the recurrent parent: at 15, 20 and 25.degree. C, significantly fewer uredinia were produced with lines having Lr2c. These results are similar to those reported by others in that not all of the specific genes tested could be shown to have a residual effect on quantitative aspects of infection. Others have reported that some virulent cultures overcome the residual effect of specific genes, but have not emphasized this aspect of their results. Genetic interactions other than those responsible for low or high infection type may affect the number of uredinia produced in these materials.