Discovery, characterisation and mapping of wheat leaf rust resistance gene Lr71

A temporarily designated gene LrARK12c (identified from spelt wheat cv. Altgold Rotkorn) with an intermediate low infection type was found effective against prevalent Australian Puccinia triticina ( Pt ) pathotypes. The gene was mapped to chromosome 1B between markers Xgwm18 and Xbarc187 , with link...

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Bibliographic Details
Published in:Euphytica 2013-03, Vol.190 (1), p.131-136
Main Authors: Singh, D., Mohler, V., Park, R. F.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Analysis
Biological and medical sciences
Biomedical and Life Sciences
Biotechnology
Centromeres
Chromosome deletion
Chromosomes
Fundamental and applied biological sciences. Psychology
Gene deletion
Gene mapping
Genes
Genetic analysis
Genetics and breeding of economic plants
Health aspects
Infection
Leaf rust
Leaves
Life Sciences
Nomenclature
Pest resistance
Physical mapping
Plant Genetics and Genomics
Plant pathogens
Plant Pathology
Plant Physiology
Plant Sciences
Puccinia triticina
Resistance to control
Seedlings
Triticum aestivum
Varietal selection. Specialized plant breeding, plant breeding aims
Wheat
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Summary:A temporarily designated gene LrARK12c (identified from spelt wheat cv. Altgold Rotkorn) with an intermediate low infection type was found effective against prevalent Australian Puccinia triticina ( Pt ) pathotypes. The gene was mapped to chromosome 1B between markers Xgwm18 and Xbarc187 , with linkage distances of 1.0 and 1.3 cM, respectively. While it was not possible to assign a definitive chromosomal arm location to LrARK12c , it maps close to the centromere based on physical mapping of SSR marker loci using deletion lines. Other genes conferring resistance to Pt in chromosome 1B include Lr33, Lr44 and Lr46 . Genetic analysis showed that LrARK12c and Lr44 are genetically independent. Comparisons of markers linked to LrARK12c and Lr46 indicate that Lr46 should be well distal to the centromere. Lr33 is not effective in the seedling stage with Australian Pt pathotypes, therefore question of possible allelism of LrARK12c and Lr33 cannot be resolved using Australian Pt pathotypes. Genetic studies, chromosome mapping and allelism tests indicated that LrARK12c is a new and genetically independent leaf rust resistance locus, and hence it was designated Lr71 in accordance with the rules of wheat gene nomenclature.
ISSN:0014-2336
1573-5060
DOI:10.1007/s10681-012-0786-x