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Simultaneous transfer, introgression, and genomic localization of genes for resistance to stem rust race TTKSK (Ug99) from Aegilops tauschii to wheat

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Abstract

Wheat production is currently threatened by widely virulent races of the wheat stem rust fungus, Puccinia graminis f. sp. tritici, that are part of the TTKSK (also known as ‘Ug99’) race group. The diploid D genome donor species Aegilops tauschii (2n = 2x = 14, DD) is a readily accessible source of resistance to TTKSK and its derivatives that can be transferred to hexaploid wheat, Triticum aestivum (2n = 6x = 42, AABBDD). To expedite transfer of TTKSK resistance from Ae. tauschii, a direct hybridization approach was undertaken that integrates gene transfer, mapping, and introgression into one process. Direct crossing of Ae. tauschii accessions with an elite wheat breeding line combines the steps of gene transfer and introgression while development of mapping populations during gene transfer enables the identification of closely linked markers. Direct crosses were made using TTKSK-resistant Ae. tauschii accessions TA1662 and PI 603225 as males and a stem rust-susceptible T. aestivum breeding line, KS05HW14, as a female. Embryo rescue enabled recovery of F1 (ABDD) plants that were backcrossed as females to the hexaploid recurrent parent. Stem rust-resistant BC1F1 plants from each Ae. tauschii donor source were used as males to generate BC2F1 mapping populations. Bulked segregant analysis of BC2F1 genotypes was performed using 70 SSR loci distributed across the D genome. Using this approach, stem rust resistance genes from both accessions were located on chromosome arm 1DS and mapped using SSR and EST-STS markers. An allelism test indicated the stem rust resistance gene transferred from PI 603225 is Sr33. Race specificity suggests the stem rust resistance gene transferred from TA1662 is unique and this gene has been temporarily designated SrTA1662. Stem rust resistance genes derived from TA1662 and PI 603225 have been made available with selectable molecular markers in genetic backgrounds suitable for stem rust resistance breeding.

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Acknowledgments

This is contribution number 13-074-J from the Kansas Agricultural Experiment Station. This project was funded by the Durable Rust Resistance in Wheat project, Cornell University through funds from The Bill & Melinda Gates Foundation and the USDA-ARS (Appropriation #5430-21000-006-00D). We thank Amy Bernardo, Paul St. Amand, Katherine Kaus and Mitchell Keller for technical assistance. Dr. Robert A. McIntosh gave helpful suggestions that improved this manuscript. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture. USDA is an equal opportunity provider and employer.

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Authors and Affiliations

  1. Department of Plant Pathology, Kansas State University, Manhattan, KS, 66506, USA

    Eric L. Olson, Robert L. Bowden & Bikram S. Gill

  2. USDA-ARS Cereal Disease Laboratory, St. Paul, MN, 55108, USA

    Matthew N. Rouse

  3. University of Minnesota, St. Paul, MN, 55108, USA

    Matthew N. Rouse

  4. Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164-6420, USA

    Michael O. Pumphrey

  5. USDA-ARS Hard Winter Wheat Genetics Research Unit, Manhattan, KS, 66506, USA

    Robert L. Bowden & Jesse A. Poland

  6. Department of Agronomy, Kansas State University, Manhattan, KS, 66506, USA

    Jesse A. Poland

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  1. Eric L. Olson
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  2. Matthew N. Rouse
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  3. Michael O. Pumphrey
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  4. Robert L. Bowden
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  5. Bikram S. Gill
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  6. Jesse A. Poland
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Correspondence to Jesse A. Poland.

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Communicated by H.-C. Jing.

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Olson, E.L., Rouse, M.N., Pumphrey, M.O. et al. Simultaneous transfer, introgression, and genomic localization of genes for resistance to stem rust race TTKSK (Ug99) from Aegilops tauschii to wheat. Theor Appl Genet 126, 1179–1188 (2013). https://doi.org/10.1007/s00122-013-2045-5

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