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GrainGenes Reference Report: TAG-102-347

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Reference	TAG-102-347
Title	Cytogenetic and molecular mapping of the leaf rust resistance gene Lr39 in wheat
Journal	Theoretical and Applied Genetics
Year	2001
Volume	102
Pages	347-352
Author	Raupp WJ Sukhwinder S Brown-Guedira GL Gill BS
Abstract	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 F2 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
External Databases	http://link.springer-ny.com/link/service/journals/00122/bibs/1102002/11020347.htm
Keyword	[ Hide all but 1 of 52 ] adult adult plant resistance aegilops aegilops squarrosa aegilops tauschii centromere chromosome chromosome 2d common wheat cross d genome disease disease resistance ditelosomic diversity f-sp tritici fungus gene hexaploid wheat leaf rust leaf rust resistance linkage linkage analysis loci lr43 mapping marker method microsatellite microsatellite marker molecular mapping monosomic analysis monosomics pathogen plant resistance population puccinia puccinia triticina resistance resistance gene resistant rust rust resistance rust resistance gene tauschii telocentric analysis telomere triticum aestivum united states virulence wichita worldwide

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