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Title:   Author  item
                                            ROSSI, C - OREGON STATE UNIVitem
                                            CUESTA-MARCOS, A - ZARAGOZA, SPAINitem
                                            VALES, I - OREGON STATE UNIVitem
                                            GOMEZ-PANDO, L - LIMA, PERUitem
                                            ORJEDA, G - LIMA, PERUitem
                                            Wise, Rogeritem
                                            SATO, K - OKAYAMA UNIV, JAPANitem
                                            HORI, K - OKAYAMA UNIV, JAPANitem
                                            CAPETTINI, F - EL BATAN, MEXICOitem
                                            VIVAR, H - EL BATAN, MEXICOitem
                                            Chen, Xianmingitem
                                            HAYES, P - OREGON STATE UNIV
  Submitted to: Molecular Breeding
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 8/24/2006
                                    Publication  Date: 10/1/2006
                                    Citation: Rossi, C., Cuesta-Marcos, A., Vales, I., Gomez-Pando, L., Orjeda, G., Wise, R.P., Sato, K., Hori, K., Capettini, F., Vivar, H., Chen, X., Hayes, P. 2006. Mapping multiple disease resistance genes using a barley mapping population evaluated in Peru, Mexico, and the USA. Molecular Breeding 18:355-366.Interpretive Summary: We used a well-characterized barley mapping population to determine if barley stripe rust (BSR) resistance genes mapped in Mexico and the USA were effective against a reported new race in Peru. Essentially the same resistance genes were detected using data from each of the three environments, indicating that these resistance alleles are effective against the spectrum of naturally occurring races at these sites.  In addition to the mapping population, we evaluated a germplasm array consisting of lines with different numbers of mapped BSR resistance genes. Rust severity differences on some of the genotypes suggest that there are differences in pathogen virulence between Mexico and Peru locations. The highest levels of resistance in Peru were observed when the qualitative resistance gene was pyramided with quantitative resistance genes.    We also used the mapping population to locate genes conferring resistance to barley leaf rust and barley powdery mildew. For mildew we identified resistance genes under field conditions in Peru that are distinct from the Mla resistance that we mapped using specific isolates under controlled conditions. These results demonstrate the long-term utility of a mapping population and a well-characterized germplasm array for mapping and validating genes conferring quantitative and qualitative resistance to multiple pathogens.
                                Technical Abstract: We used a well-characterized barley mapping population to determine if barley stripe rust (BSR) resistance QTL mapped in Mexico and the USA were effective against a reported new race in Peru. Essentially the same resistance QTL were detected using data from each of the three environments, indicating that these resistance alleles are effective against the spectrum of naturally occurring races at these sites.  In addition to the mapping population, we evaluated a germplasm array consisting of lines with different numbers of mapped BSR resistance alleles. A higher BSR disease severity on CI10587, which has a single qualitative resistance gene, in Peru vs. Mexico suggests that there are differences in pathogen virulence between the two locations. Confirmation of a new race in Peru will require characterization using a standard set of differentials, an experiment that is underway.  The highest levels of resistance in Peru were observed when the qualitative resistance gene was pyramided with quantitative resistance alleles.    We also used the mapping population to locate QTL conferring resistance to barley leaf rust and barley powdery mildew. For mildew we identified resistance QTL under field conditions in Peru that are distinct from the Mla resistance that we mapped using specific isolates under controlled conditions. These results demonstrate the long-term utility of a mapping population and a well-characterized germplasm array for mapping and validating genes conferring quantitative and qualitative resistance to multiple pathogens.


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