Abstract
Slow rusting is considered a crucial component of durable resistance to wheat leaf rust caused by Puccinia triticina and is often expressed in the form of a prolonged latent period. Selection for a longer latent period is considered an effective approach to developing wheat cultivars with improved durable resistance to leaf rust. A recombinant inbred line (RIL) population derived from CI 13227 (long latent period) × Suwon 92 (short latent period) was phenotyped for latent period in two greenhouse experiments in separate years, and amplified fragment length polymorphism (AFLP) and simple sequence repeat (SSR) markers were analyzed in the same population. Among the RILs, the frequency distribution for latent period was continuous, and latent period was highly correlated between years (r=0.94, P<0.0001). A quantitative trait locus (QTL) prolonging the latent period of P. triticina, designated as QLrlp.osu-2DS, explained 42.8% and 54.5% of the phenotypic and genetic variance in the two experiments, respectively. QLrlp.osu-2DS was mapped on the distal region of chromosome 2DS. Two other QTLs for latent period, QLrlp.osu-2B and QLrlp.osu-7BL, were localized on chromosome 2B and the long arm of chromosome 7B, respectively. Multiple regression analysis showed that these three QTLs collectively explained 58.0% and 73.8% of the phenotypic and genetic variance over two experiments, respectively. Fourteen RILs that carried all three alleles for long latent period at three AFLP loci flanking QLrlp.osu-2DS, QLrlp.osu-2B, and QLrlp.osu-7BL had a mean latent period of 12.5 days, whereas 13 RILs without any long-latent-period alleles at the corresponding loci had a mean latent period of 7.4 days. Three SSR markers closely linked to these QTLs have potential to be applied in marker-assisted selection for prolonged latent period in wheat.
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Acknowledgements
We thank Perry Cregan and Qijian Song (Soybean Genomics and Improvement Laboratory, USDA, ARS, Beltsville Agricultural Research Center, Beltsville, Md., USA) for providing the BARC SSR primer sequences, Richard Ward (Department of Crop and Soil Science, Michigan State University, East Lansing, Mich., USA) and Bikram S. Gill (Department of Pathology, Kansas State University, Manhattan, Kan., USA) for providing mapping information for the BARC SSR markers, and Daryl Somers for providing primer and mapping information for the WMC SSR markers.
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Communicated by G. Wenzel
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Xu, XY., Bai, GH., Carver, B.F. et al. Mapping of QTLs prolonging the latent period of Puccinia triticina infection in wheat. Theor Appl Genet 110, 244–251 (2005). https://doi.org/10.1007/s00122-004-1819-1
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DOI: https://doi.org/10.1007/s00122-004-1819-1