Cytogenetic and molecular mapping of the leaf rust resistance gene Lr39 in wheat

Leaf rust, caused by the fungus Puccinia triticina Eriks,is one of the most serious diseases of wheat (Triticum aestivum AABBDD, 2n=6x=42) worldwide. Growing resistant cultivars is an efficient and economical method of reducing losses to leaf rust. Here we report a new leaf rust resistance gene, Lr3...

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Published in:Theoretical and applied genetics 2001-02, Vol.102 (2-3), p.347-352
Main Authors: RAUPP, W. J, SUKHWINDER-SINGH, BROWN-GUEDIRA, G. L, GILL, B. S
Format: Article
Language:English
Subjects:
Aegilops tauschii
Agronomy. Soil science and plant productions
Biological and medical sciences
Chi-square test
chromosome 2D
Chromosomes
Cultivars
Fundamental and applied biological sciences. Psychology
Genes
Genetics and breeding of economic plants
Genomes
Germplasm
Goat grass
Lr39 gene
Pathogens
Pest resistance
Plant pathogens
Plant pathology
Plant resistance
Plant sciences
Puccinia triticina
Triticum aestivum
Varietal selection. Specialized plant breeding, plant breeding aims
Wheat
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Summary:Leaf rust, caused by the fungus Puccinia triticina Eriks,is one of the most serious diseases of wheat (Triticum aestivum AABBDD, 2n=6x=42) worldwide. Growing resistant cultivars is an efficient and economical method of reducing losses to leaf rust. Here we report a new leaf rust resistance gene, Lr39, transferred from Aegilops tauschii into common wheat. Lr39 conditions both seedling and adult plant resistance to the leaf rust pathogen. The inter- and intra-chromosomal mapping of the Lr39 gene showed that it is different from all previously described Lr genes. We used monosomic analysis for the inter-chromosomal mapping and wheat microsatellite markers for the intra-chromosomal mapping. The monosomic and ditelosomic analysis indicated that Lr39 is independent of the centromere on the short arm of chromosome 2D. Eight microsatellite markers for 2DS were used for linkage analysis on a population of 57 F^sub 2^ plants derived from a cross of an Ae. tauschii-derived wheat, cv. Wichita line TA4186 (possessing Lr39), with Wichita monosomics for the D-genome chromosomes. The microsatellite marker analysis confirmed the location of the gene on 2DS. Three markers were polymorphic and linked to the gene. The closest marker Xgwm210 mapped 10.7 cM from Lr39. The location of Lr39 near the telomere of 2DS distinguishes it from the Lr2 and Lr22 loci, which are located on 2DS proximal to Xgwm210.[PUBLICATION ABSTRACT]
ISSN:0040-5752
1432-2242
DOI:10.1007/s001220051652