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Genetic analysis and molecular mapping of crown rust resistance in common wheat

Zhixia Niu, Krishna D. Puri, Shiaoman Chao, Yue Jin, Yongliang Sun, Brian J. Steffenson, Shivcharan S. Maan, Steven S. Xu, Shaobin Zhong
Theoretical and applied genetics 2014 v.127 no.3 pp. 609-619
Hordeum vulgare, Puccinia coronata, Triticum aestivum, barley, chromosome mapping, chromosomes, crossing, crown rust, dominant genes, genotype, microsatellite repeats, parents, pathogens, quantitative trait loci, spring, winter wheat, Great Plains region, United States
Barley crown rust, caused by Puccinia coronata var. hordei, primarily occurs on barley in the Great Plain regions of the United States. However, a few genotypes of common wheat were found to be susceptible to this pathogen among 750 wheat accessions evaluated. To investigate the genetics of crown rust resistance in wheat, a susceptible winter wheat accession PI 350005 was used in crosses with two resistant wheat varieties, Chinese Spring and Chris. Analysis of F1 plants and F2 populations from these two crosses indicated that crown rust resistance is controlled by one and two dominant genes in Chris and Chinese Spring, respectively. To determine the chromosome location of the resistance gene Cr1 in Chris, a set of 21 monosomic lines derived from Chris were used as female parents in a cross with a susceptible spring type selection (SSTS35) derived from a PI 350005/Chris cross. Monosomic analysis indicated that Cr1 is located on chromosome 5D in Chris. The results also indicated that one of the crown rust resistance genes in Chinese Spring is located on chromosome 2D, while the other gene is not on 5D and thus it is different from Cr1. Molecular linkage analysis and QTL mapping using a population of 136 doubled haploid lines derived from the Chris/PI 350005 cross further positioned Cr1 between the SSR markers Xwmc41-2 and Xgdm63 located on the long arm of chromosome 5D. Our study suggests that near non-host resistance to crown rust in these different common wheat genotypes is simply inherited.