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Identification, mapping, and marker development of stem rust resistance genes in durum wheat ‘Lebsock’

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Abstract

Wheat production in many wheat-growing regions is vulnerable to stem rust, caused by Puccinia graminis f. sp. tritici (Pgt). Several previous studies showed that most of the durum cultivars adapted to the upper Great Plains in the USA have good resistance to the major Pgt pathotypes, including the Ug99 race group. To identify the stem rust resistance (Sr) genes in the durum cultivar ‘Lebsock’, a tetraploid doubled haploid (DH) population derived from a cross between Lebsock and Triticum turgidum ssp. carthlicum PI 94749 was screened with the Pgt races TTKSK, TRTTF, and TTTTF. The stem rust data and the genotypic data previously developed were used to identify quantitative trait loci (QTL) associated with resistance. We identified one QTL each on chromosome arms 4AL, 6AS, 6AL, and 2BL. Based on marker and race-specification analysis, we postulated that the QTL on 4AL, 6AS, 6AL, and 2BL correspond to Sr7a, Sr8155B1, Sr13, and likely Sr9e, respectively. The results indicated that most of the US durum germplasm adapted to the upper Great Plains likely harbors the four major Sr genes characterized in this study. Among these genes, Sr8155B1 was recently identified and shown to be unique in that it conferred susceptibility to TTKSK but resistance to variant race TTKST. Two, three, and one thermal asymmetric reverse PCR (STARP) markers were developed for Sr7a, Sr8155-B1, and Sr13, respectively. Knowledge of the Sr genes in durum germplasm and the new STARP markers will be useful to pyramid and deploy multiple Sr genes in future durum and wheat cultivars.

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Acknowledgments

Mention of trade names or commercial products in this article 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.

Funding

This research was supported in part by funds to S. S. X. provided through a grant from the Bill & Melinda Gates Foundation and UK Department for International Development to Cornell University for the Borlaug Global Rust Initiative (BGRI) Durable Rust Resistance in Wheat (DRRW) Project and the USDA-ARS CRIS Project No. 3060-21000-038-00D.

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Authors and Affiliations

  1. Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108, USA

    Jyoti Saini, Qijun Zhang, Yunming Long, Elias M. Elias & Phillip E. McClean

  2. USDA-ARS, Cereal Crops Research Unit, Red River Valley Agricultural Research Center, 1605 Albrecht Blvd. North, Fargo, ND, 58102-2765, USA

    Justin D. Faris, Daryl L. Klindworth, Michael C. Edwards & Steven S. Xu

  3. USDA-ARS, Cereal Disease Laboratory and Department of Plant Pathology, University of Minnesota, St. Paul, MN, 55108, USA

    Matthew N. Rouse & Yue Jin

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  1. Jyoti Saini
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Correspondence to Steven S. Xu.

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Key message Four quantitative trait loci at gene loci Sr7, Sr9, Sr13, and Sr8155B1 were identified in durum ‘Lebsock’ and six new STARP markers were developed for the Sr7, Sr13, and Sr8155B1 regions.

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Saini, J., Faris, J.D., Zhang, Q. et al. Identification, mapping, and marker development of stem rust resistance genes in durum wheat ‘Lebsock’. Mol Breeding 38, 77 (2018). https://doi.org/10.1007/s11032-018-0833-y

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