Genetics of leaf rust resistance in three Americano landrace-derived wheat cultivars from Uruguay

James Kolmer, L. M. Oelke, J. Q. Liu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A genetic analysis of the landrace-derived wheat accessions Americano 25e, Americano 26n, and Americano 44d, from Uruguay was conducted to identify the leaf rust resistance genes present in these early wheat cultivars. The three cultivars were crossed with the leaf rust susceptible cultivar 'Thatcher' and approximately 80 backcross (BC1) F2 families were derived for each cross. The BC1F2 families and selected BC1F4 lines were tested for seedling and adult plant leaf rust resistance with selected isolates of leaf rust, Puccinia triticina. The segregation and infection type data indicated that Americano 25e had seedling resistance genes Lr3, Lr16, an additional unidentified seedling gene, and one adult plant resistance gene that was neither Lr12 nor Lr13, and did not phenotypically resemble Lr34. Americano 26n was postulated to have genes Lr11, Lr12, Lr13, and Lr14a. Americano 44d appeared to have two possibly unique adult plant leaf rust resistance genes.

Original languageEnglish (US)
Pages (from-to)152-157
Number of pages6
JournalPlant Breeding
Volume126
Issue number2
DOIs
StatePublished - Apr 1 2007

Keywords

  • Adult plant resistance
  • Puccinia triticina
  • Seedling resistance
  • Triticum aestivum
  • Wheat leaf rust

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