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GrainGenes Reference Report: TAG-127-2041

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Reference
TAG-127-2041
Title
Characterisation and mapping of gene Lr73 conferring seedling resistance to Puccinia triticina in common wheat
Journal
Theoretical and Applied Genetics
Year
2014
Volume
127
Pages
2041-2049
Author
Park RF
Mohler V
Nazari K
Singh D
Abstract
The wheat genotype Morocco, widely susceptible to isolates of Puccinia triticina, was resistant to an Australian isolate of this pathogen collected in 2004. Genetic studies established that the resistance in Morocco was also present the Australian wheat genotypes Avocet, Halberd, Harrier, Tincurrin and a selection of cultivar Warigal lacking the resistance gene Lr20. Genetic studies based on a cross with Halberd showed that the gene is dominant and located on chromosome 2BS (XwPt8760-4 cM-Lr73-1.4 cM-XwPt8235). The gene was genetically independent of the Lr13, Lr16 and Lr23 loci, also located on chromosome 2BS, indicating that it is distinct. The locus designation Lr73 was therefore assigned. On the basis of multi-pathotype tests, it is likely Lr73 is also present in the Australian wheat cultivars Clearfield STL, Federation (with Lr10), Gatcher (with Lr10 and Lr27+Lr31), Marombi (with Lr1 and Lr37), Pugsley (with Lr1 and Lr37), Spear (with Lr1), Stiletto and Tarsa (with Lr1). Gene Lr73 is unlikely to be of value in resistance breeding. However, recognising Lr73 is important to avoid its inadvertent selection in breeding programmes. Furthermore, the apparent rarity of avirulence for genes like Lr73, sometimes referred to as “fossil” resistance genes, makes them of interest in terms of the evolution of disease resistance in host plants and of virulence in the respective rust pathogens.
External Databases
PubMed: 25116148
Gene
Lr73 (Triticum)
Locus
Lr73
Gene Catalogue Number
10969

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