Effect of gene Lr34 in the enhancement of resistance to leaf rust of wheat

S. E. German, J. A. Kolmer

Research output: Contribution to journalArticlepeer-review

124 Scopus citations

Abstract

Leaf rust resistance gene Lr34 is present in many wheat cultivars throughout the world that have shown durable resistance to leaf rust. Fourteen pair-wise combinations of Lr34 and seedling leaf rust resistance genes were developed by intercrossing near isogenic 'Thatcher' lines. In both seedling and adult plant tests homozygous paired combinations of specific resistance genes with Lr34 had enhanced resistance relative to either parent to different numbers of isolates that were avirulent to the additional resistance genes. The Tc Lr34, 18 line also expressed enhanced resistance to specific isolates virulent to Lr18 in seedling and adult plant stages. In rust nursery tests, homozygous lines were more resistant than either parent, if the additional leaf rust gene conditioned an effective of resistance when present singly. The ability of Lr34 to interact with other genes conditioning effective resistance may contribute to the durability of leaf rust resistance in cultivars with Lr34.

Original languageEnglish (US)
Pages (from-to)97-105
Number of pages9
JournalTheoretical and Applied Genetics
Volume84
Issue number1-2
DOIs
StatePublished - Jun 1 1992

Keywords

  • Puccinia recondita
  • Resistance gene combinations
  • Triticum

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