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This article in CS

  1. Vol. 22 No. 6, p. 1167-1170
    Received: Oct 16, 1981

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Probable Genotypes of Hard Red Spring Wheats for Resistance to Puccinia recondita f. sp. tritici1

  1. Syed S. A. Rizvi and
  2. Glen D. Statler2



Simultaneous inoculations of 20 hard red spring wheat (HRSW) cultivars (Triticum aestivum L. em. Thell.) and 20 near-isogenic HRSW lines with known genes for low reaction were made with each of 20 selected cultures of Puccinia recondita f. sp. tritici. The infection types were classified as low infection types (LIT) and high infection type (HIT). Comparisons of infection type (IT) data was facilitated by a Fortran computer program. Absence of cultures in the LIT:HIT category in paired near-isogenic line to cultivar comparisons and similarities of IT data was used to hypothesize genotype(s) in the host cultivars. We used this comparative infection type data to speculate on the presence of seedling genes for resistance to P. recondita f. sp. tritici in many of the commercially grown HRSW cultivars in North Dakota. Several cultivars had genes in addition to those hypothesized and some have genes in common. This technique has utility for the mass identification of gene pools and favors rapid selection of the genes that condition resistance to the populations of P. recondita f. sp. tritici.

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