Molecular Breeding

, 35:170 | Cite as

QTL mapping of adult plant resistance to Ug99 stem rust in the spring wheat population RB07/MN06113-8



The emergence and spread of the Ug99 race group of the stem rust pathogen (Puccinia graminis Pers. f. sp. tritici) in the past decade have exposed the vulnerability of wheat (Triticum aestivum L.) to this disease. Discovery of novel and effective sources of resistance is vital for breeding resistant varieties to avert losses. The experimental breeding line MN06113-8 and cultivar RB07 developed by the University of Minnesota wheat breeding program exhibited adult plant resistance (APR) to the Ug99 race group in field tests in Kenya and Ethiopia. Both lines were found to be susceptible at the seedling stage to isolates of the race TTKSK, TTKST, and TTTSK. To dissect the genetic mechanism of resistance present in these lines, MN06113-8 was crossed to RB07 to generate 141 F6 recombinant inbred lines (RILs). The RIL population was evaluated for APR to Ug99 in Kenya and Ethiopia over three seasons and for resistance to North American stem rust pathogen races in St. Paul, MN, in one season. The population was genotyped using high-throughput SNP genotyping assays. Composite interval mapping detected six quantitative trait loci (QTL) involved in APR to African stem rust races and three QTLs involved in stem rust resistance to North American stem rust races. One QTL located on chromosome 2B was associated with APR to stem rust races in all environments. Development of diagnostic markers linked to this gene will facilitate marker-assisted selection of resistant lines to develop varieties with enhanced levels of stem rust resistance.


Linkage mapping Recombinant inbred lines Stem rust Ug99 Genotyping by sequencing Resistance breeding 



We thank the University of Minnesota Genomics Center, University of Minnesota Supercomputing Institute, the Microbial & Plant Genomics Institute, the University of Minnesota Graduate School, Kenya Agriculture and Livestock Research Organization, Ethiopia Institute of Agricultural Research, USDA-ARS Cereal Disease Laboratory personnel, and Anderson Wheat Lab for their help and support during various phases of the project. Funding for this work was provided by the United States Department of Agriculture, Agriculture and Food Research Initiative and 2011-68002-30029 (Triticeae Coordinated Agricultural Project,, the Borlaug Global Rust Initiative Durable Rust Resistance in Wheat Project (administered by Cornell University with a grant from the Bill & Melinda Gates Foundation), and the UK Department for International Development.

Author contribution

P.B. supervised planting of the RIL population in St. Paul, MN; recorded the phenotype of the RIL population in St. Paul, MN; carried out genotyping of the plant materials and data analysis; and drafted the manuscript. M.N.R. recorded the phenotype in East African nurseries and assisted in preparing the manuscript. S.B. supervised planting of and disease inoculation on the population in East African rust nurseries. J.A.A. conceived the study, developed the population, supervised the project, and assisted in preparing the manuscript. All authors contributed to and approved the final manuscript.

Compliance with ethical standards

Conflicts of interest

The authors declare that they have no conflict of interest.

Human participants and/or animals statement

Not applicable.

Informed consent

Not applicable.

Supplementary material

11032_2015_362_MOESM1_ESM.xlsx (82 kb)
Supplementary material 1 (XLSX 81 kb)


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© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.Department of Agronomy and Plant GeneticsUniversity of MinnesotaSt. PaulUSA
  2. 2.Cereal Disease LaboratoryUnited States Department of Agriculture-Agricultural Research Service (USDA-ARS)St. PaulUSA
  3. 3.Department of Plant PathologyUniversity of MinnesotaSt. PaulUSA
  4. 4.International Maize and Wheat Improvement Center (CIMMYT)ICRAF HouseNairobiKenya

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