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Sharma JS, Che M, Fetch T, McCallum BD, Xu SS, Hiebert CW. Identification of Sr67, a new gene for stem rust resistance in KU168-2 located close to the Sr13 locus in wheat. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2024; 137:30. [PMID: 38265482 PMCID: PMC10808535 DOI: 10.1007/s00122-023-04530-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 12/14/2023] [Indexed: 01/25/2024]
Abstract
KEY MESSAGE Sr67 is a new stem rust resistance gene that represents a new resource for breeding stem rust resistant wheat cultivars Re-appearance of stem rust disease, caused by the fungal pathogen Puccinia graminis f. sp. tritici (Pgt), in different parts of Europe emphasized the need to develop wheat varieties with effective resistance to local Pgt populations and exotic threats. A Kyoto University wheat (Triticum aestivum L.) accession KU168-2 was reported to carry good resistance to leaf and stem rust. To identify the genomic region associated with the KU168-2 stem rust resistance, a genetic study was conducted using a doubled haploid (DH) population from the cross RL6071 × KU168-2. The DH population was phenotyped with three Pgt races (TTKSK, TPMKC, and QTHSF) and genotyped using the Illumina 90 K wheat SNP array. Linkage mapping showed the resistance to all three Pgt races was conferred by a single stem rust resistance (Sr) gene on chromosome arm 6AL, associated with Sr13. Presently, four Sr13 resistance alleles have been reported. Sr13 allele-specific KASP and STARP markers, and sequencing markers all showed null alleles in KU168-2. KU168-2 showed a unique combination of seedling infection types for five Pgt races (TTKSK, QTHSF, RCRSF, TMRTF, and TPMKC) compared to Sr13 alleles. The phenotypic uniqueness of the stem rust resistance gene in KU168-2 and null alleles for Sr13 allele-specific markers showed the resistance was conferred by a new gene, designated Sr67. Since Sr13 is less effective in hexaploid background, Sr67 will be a good source of stem rust resistance in bread wheat breeding programs.
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Affiliation(s)
- Jyoti Saini Sharma
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Mingzhe Che
- Department of Plant Pathology, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Thomas Fetch
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada
| | - Brent D McCallum
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada
| | - Steven S Xu
- Crop Improvement and Genetics Research Unit, Western Regional Research Center, USDA-ARS, 800 Buchanan Street, Albany, CA, 94710, USA
| | - Colin W Hiebert
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada.
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McCallum BD, Hiebert CW. Interactions Between Lr67 or Lr34 and Other Leaf Rust Resistance Genes in Wheat ( Triticum aestivum). FRONTIERS IN PLANT SCIENCE 2022; 13:871970. [PMID: 35668794 PMCID: PMC9164135 DOI: 10.3389/fpls.2022.871970] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 04/25/2022] [Indexed: 06/15/2023]
Abstract
The wheat multi-pest resistance genes Lr67 and Lr34 are similar in that they both condition resistance to many diseases, in a non-race-specific manner, and code for cellular transporters. Lr34 plays a critical role in breeding wheat for disease resistance in large part because it interacts with other resistance genes to result in effective and durable resistance. To determine if Lr67 interacts with other resistance genes in a similar manner as Lr34 six different doubled haploid populations were developed which segregated for either Lr67 or Lr34 along with a second resistance gene, either Lr13, Lr16, or Lr32. The presence or absence of each of these genes in the progeny lines was determined by molecular marker analysis. These six populations were tested for leaf rust field resistance in the same environments to compare the effects of Lr34 and Lr67 alone, and in combination with Lr13, Lr16 or Lr32. Lr67 and Lr34 significantly reduced the levels of rust severity, Lr34 showed a significant interaction with Lr13 but Lr67 did not. Both genes interacted with Lr16, and Lr67 had a significant interaction with Lr32. This analysis demonstrates the similar effect of Lr67, as seen with Lr34, on the interaction with other resistance genes to give a better level of resistance than with single resistance genes. While Lr67 is not widely deployed in agriculture, it could play an important role in disease resistance in future wheat cultivars.
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Origin and genetic analysis of stem rust resistance in wheat line Tr129. Sci Rep 2022; 12:4585. [PMID: 35301415 PMCID: PMC8931155 DOI: 10.1038/s41598-022-08681-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 03/09/2022] [Indexed: 11/16/2022] Open
Abstract
Wheat line Tr129 is resistant to stem rust, caused by Puccinia graminis f. sp. tritici (Pgt). The resistance in Tr129 was reportedly derived from Aegilops triuncialis, but the origin and genetics of resistance have not been confirmed. Here, genomic in situ hybridization (GISH) showed that no Ae. triuncialis chromatin was present in Tr129. Genetic and phenotypic analysis was conducted on F2 and DH populations from the cross RL6071/Tr129. Seedlings were tested with six Pgt races and were genotyped using an Illumina iSelect 90 K SNP array and kompetitive allele specific PCR (KASP) markers. Mapping and phenotyping showed that Tr129 carried four stem rust resistance (Sr) genes on chromosome arms 2BL (Sr9b), 4AL (Sr7b), 6AS (Sr8a), and 6DS (SrTr129). SrTr129 co-segregated with markers for SrCad, however Tr129 has a unique haplotype suggesting the resistance could be new. Analysis of a RL6071/Peace population revealed that like SrTr129, SrCad is ineffective against three North American races. This new understanding of SrCad will guide its use in breeding. Tr129 and the DNA markers reported here are useful resources for improving stem rust resistance in cultivars.
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Rauf Y, Bajgain P, Rouse MN, Khanzada KA, Bhavani S, Huerta-Espino J, Singh RP, Imtiaz M, Anderson JA. Molecular Characterization of Genomic Regions for Adult Plant Resistance to Stem Rust in a Spring Wheat Mapping Population. PLANT DISEASE 2022; 106:439-450. [PMID: 34353123 DOI: 10.1094/pdis-03-21-0672-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Adult plant resistance (APR) to wheat stem rust has been one of the approaches for resistance breeding since the evolution of the Ug99 race group and other races. This study was conducted to dissect and understand the genetic basis of APR to stem rust in spring wheat line 'Copio'. A total of 176 recombinant inbred lines (RILs) from the cross of susceptible parent 'Apav' with Copio were phenotyped for stem rust resistance in six environments. Composite interval mapping using 762 genotyping-by-sequencing markers identified 16 genomic regions conferring stem rust resistance. Assays with gene-linked molecular markers revealed that Copio carried known APR genes Sr2 and Lr46/Yr29/Sr58 in addition to the 2NS/2AS translocation that harbors race-specific genes Sr38, Lr37, and Yr17. Three quantitative trait loci (QTLs) were mapped on chromosomes 2B, two QTLs on chromosomes 3A, 3B, and 6A each, and one QTL on each of chromosomes 2A, 1B, 2D, 4B, 5D, 6D, and 7A. The QTL QSr.umn.5D is potentially a new resistance gene and contributed to quantitative resistance in Copio. The RILs with allelic combinations of Sr2, Sr38, and Sr58 had 27 to 39% less stem rust coefficient of infection in all field environments compared with RILs with none of these genes, and this gene combination was most effective in the U.S. environments. We conclude that Copio carries several genes that provide both race-specific and non-race-specific resistance to diverse races of stem rust fungus and can be used by breeding programs in pyramiding other effective genes to develop durable resistance in wheat.
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Affiliation(s)
- Yahya Rauf
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, U.S.A
| | - Prabin Bajgain
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, U.S.A
| | - Matthew N Rouse
- Cereal Disease Lab, United States Department of Agriculture, St. Paul, MN 55108, U.S.A
| | - Khalil A Khanzada
- Cereal Disease Research Institute, Pakistan Agricultural Research Council, University of Karachi 75270, Pakistan
| | - Sridhar Bhavani
- Global Wheat Program, International Maize and Wheat Improvement Center, Mexico City, 06600, Mexico
| | - Julio Huerta-Espino
- Global Wheat Program, International Maize and Wheat Improvement Center, Mexico City, 06600, Mexico
| | - Ravi P Singh
- Global Wheat Program, International Maize and Wheat Improvement Center, Mexico City, 06600, Mexico
| | - Muhammad Imtiaz
- Global Wheat Program, International Maize and Wheat Improvement Center, National Agricultural Research Center, Islamabad 44000, Pakistan
| | - James A Anderson
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, U.S.A
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Semagn K, Iqbal M, Chen H, Perez-Lara E, Bemister DH, Xiang R, Zou J, Asif M, Kamran A, N'Diaye A, Randhawa H, Beres BL, Pozniak C, Spaner D. Physical mapping of QTL associated with agronomic and end-use quality traits in spring wheat under conventional and organic management systems. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2021; 134:3699-3719. [PMID: 34333664 DOI: 10.1007/s00122-021-03923-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 07/20/2021] [Indexed: 06/13/2023]
Abstract
Using phenotypic data of four biparental spring wheat populations evaluated at multiple environments under two management systems, we discovered 152 QTL and 22 QTL hotspots, of which two QTL accounted for up to 37% and 58% of the phenotypic variance, consistently detected in all environments, and fell within genomic regions harboring known genes. Identification of the physical positions of quantitative trait loci (QTL) would be highly useful for developing functional markers and comparing QTL results across multiple independent studies. The objectives of the present study were to map and characterize QTL associated with nine agronomic and end-use quality traits (tillering ability, plant height, lodging, grain yield, grain protein content, thousand kernel weight, test weight, sedimentation volume, and falling number) in hard red spring wheat recombinant inbred lines (RILs) using the International Wheat Genome Sequencing Consortium (IWGSC) RefSeq v2.0 physical map. We evaluated a total of 698 RILs from four populations derived from crosses involving seven parents at 3-8 conventionally (high N) and organically (low N) managed field environments. Using the phenotypic data combined across all environments per management, and the physical map between 1058 and 6526 markers per population, we identified 152 QTL associated with the nine traits, of which 29 had moderate and 2 with major effects. Forty-nine of the 152 QTL mapped across 22 QTL hotspot regions with each region coincident to 2-6 traits. Some of the QTL hotspots were physically located close to known genes. QSv.dms-1A and QPht.dms-4B.1 individually explained up to 37% and 58% of the variation in sedimentation volume and plant height, respectively, and had very large LOD scores that varied from 19.0 to 35.7 and from 16.7 to 55.9, respectively. We consistently detected both QTL in the combined and all individual environments, laying solid ground for further characterization and possibly for cloning.
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Affiliation(s)
- Kassa Semagn
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture-Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada
| | - Muhammad Iqbal
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture-Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada
| | - Hua Chen
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture-Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada
- Department of Agronomy, School of Life Science and Engineering, Southwest University of Science and Technology, 59 Qinglong Road, Mianyang, 621010, Sichuan, China
| | - Enid Perez-Lara
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture-Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada
| | - Darcy H Bemister
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture-Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada
| | - Rongrong Xiang
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture-Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada
| | - Jun Zou
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture-Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada
| | - Muhammad Asif
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture-Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada
- Department of Agronomy, 2004 Throckmorton Plant Science Center, Kansas State University, Manhattan, KS, 66506, USA
- Heartland Plant Innovations, Kansas Wheat Innovation Center, 1990 Kimball Avenue, Manhattan, KS, 66502, USA
| | - Atif Kamran
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture-Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada
- Department of Botany, Seed Centre, The University of Punjab, New Campus, Lahore, 54590, Pakistan
| | - Amidou N'Diaye
- Crop Development Centre and Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N 5A8, Canada
| | - Harpinder Randhawa
- Agriculture, and Agri-Food Canada, 5403-1st Avenue South, Lethbridge, AB, T1J 4B1, Canada
| | - Brian L Beres
- Agriculture, and Agri-Food Canada, 5403-1st Avenue South, Lethbridge, AB, T1J 4B1, Canada
| | - Curtis Pozniak
- Crop Development Centre and Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N 5A8, Canada
| | - Dean Spaner
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture-Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada.
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Ghanbarnia K, Gourlie R, Amundsen E, Aboukhaddour R. The Changing Virulence of Stripe Rust in Canada from 1984 to 2017. PHYTOPATHOLOGY 2021; 111:1840-1850. [PMID: 33673753 DOI: 10.1094/phyto-10-20-0469-r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Stripe rust, caused by the fungal pathogen Puccinia striiformis f. sp. tritici, is an important wheat disease worldwide. In this study, the P. striiformis f. sp. tritici population in Canada, representing a time period from 1984 to 2017, was analyzed for virulence diversity and geographical distribution. Virulence of 140 P. striiformis f. sp. tritici isolates was evaluated on 17 near-isogenic wheat lines in the 'Avocet S' background, each containing a single resistance gene along with an 18th line 'Tyee'. Seedlings were inoculated with a urediniospore/talc mixture and infection types were evaluated on a scale of 0 to 9. In total, 89 races were identified with various combinations of defeated Yr genes. Clear changes in pathogen virulence have been observed through time that are confirmed by clustering algorithms. The results showed that the tested P. striiformis f. sp. tritici isolates remained avirulent on Yr1, Yr5, and Yr15, and have very low frequency of virulence on Yr76, but had high frequencies of virulence on Yr6, Yr7, Yr8, Yr9, Yr17, Yr43, Yr44, YrTr1, and YrExp2. P. striiformis f. sp. tritici virulence spiked on Yr7, Yr8, and Yr9 for the first time in 2000, and on Yr10 and Yr27 in 2010. Overall, the predominant races in Canada were very similar to those reported in the United States (PSTv-37, PSTv-41, and PSTv-52), which indicates long-distance migration of P. striiformis f. sp. tritici from the United States to Canada. Sixty-four races had unique virulence combinations that had not been previously reported in the United States, which suggested that evolution of virulence/avirulence for host resistance by mutation at local scale, is possible. Analysis of diversity between Canadian isolates and races from the United States since 2010 showed that the P. striiformis f. sp. tritici population in western Canada is similar to that in the western states of the United States, and that the population in eastern Canada is similar to the eastern and/or central regions of the United States, supporting the hypothesis that specific P. striiformis f. sp. tritici populations in North America travel through different wind trajectories.
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Affiliation(s)
- Kaveh Ghanbarnia
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, Alberta T1J 4B1, Canada
| | - Ryan Gourlie
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, Alberta T1J 4B1, Canada
| | - Eric Amundsen
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, Alberta T1J 4B1, Canada
| | - Reem Aboukhaddour
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, Alberta T1J 4B1, Canada
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Liu T, Fedak G, Zhang L, Zhou R, Chi D, Fetch T, Hiebert C, Chen W, Liu B, Liu D, Zhang H, Zhang B. Molecular Marker Based Design for Breeding Wheat Lines with Multiple Resistance and Superior Quality. PLANT DISEASE 2020; 104:2658-2664. [PMID: 32749944 DOI: 10.1094/pdis-02-20-0420-re] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
There has not been a major wheat stem rust epidemic worldwide since the 1970s, but the emergence of race TTKSK of Puccinia graminis f. sp. tritici in 1998 presented a great threat to the world wheat production. Single disease-resistance genes are usually effective for only several years before the pathogen changes genetically to overcome the resistance. Stripe rust caused by Puccinia striiformis f. sp. tritici (Pst) is one of the most common and persistent wheat diseases worldwide. The development of varieties with multiple resistance is the most economical and effective strategy for preventing stripe rust and stem rust, the two main rust diseases constraining wheat production. Plateau 448 has been widely used in the spring wheat growing region in northwest China, but it has become susceptible to stripe rust and is susceptible to TTKSK. To produce more durable resistance to race TTKSK as well as to stripe rust, four stem rust resistance genes (Sr33, Sr36, Sr-Cad, and Sr43) and three stripe rust resistance genes (Yr5, Yr18, and Yr26) were simultaneously introgressed into Plateau 448 to improve its stem rust (Ug99) and stripe rust resistance using a marker-assisted backcrossing strategy combined with phenotypic selection. We obtained 131 BC1F5 lines that pyramided two to four Ug99 resistance genes and one to two Pst resistance genes simultaneously. Thirteen of these lines were selected for their TTKSK resistance, and all of them exhibited near immunity or high resistance to TTKSK. Among the 131 pyramided lines, 95 showed high resistance to mixed Pst races. Nine lines exhibited not only high resistance to TTKSK and Pst but also better agronomic traits and high-molecular-weight glutenin subunit compositions than Plateau 448.
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Affiliation(s)
- Tao Liu
- Key Laboratory of Adaptation and Evolution of Plateau Biota (AEPB), Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai 810008, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - George Fedak
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada
| | - Lianquan Zhang
- Qinghai Province Key Laboratory of Crop Molecular Breeding, Xining, Qinghai 810008, China
| | - Rangrang Zhou
- Key Laboratory of Adaptation and Evolution of Plateau Biota (AEPB), Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai 810008, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dawn Chi
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada
| | - Tom Fetch
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada
| | - Colin Hiebert
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada
| | - Wenjie Chen
- Key Laboratory of Adaptation and Evolution of Plateau Biota (AEPB), Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai 810008, China
- Qinghai Province Key Laboratory of Crop Molecular Breeding, Xining, Qinghai 810008, China
| | - Baolong Liu
- Key Laboratory of Adaptation and Evolution of Plateau Biota (AEPB), Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai 810008, China
- Qinghai Province Key Laboratory of Crop Molecular Breeding, Xining, Qinghai 810008, China
| | - Dengcai Liu
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Huaigang Zhang
- Key Laboratory of Adaptation and Evolution of Plateau Biota (AEPB), Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai 810008, China
- Qinghai Province Key Laboratory of Crop Molecular Breeding, Xining, Qinghai 810008, China
| | - Bo Zhang
- Key Laboratory of Adaptation and Evolution of Plateau Biota (AEPB), Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai 810008, China
- Qinghai Province Key Laboratory of Crop Molecular Breeding, Xining, Qinghai 810008, China
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8
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Bokore FE, Knox RE, Cuthbert RD, Pozniak CJ, McCallum BD, N’Diaye A, DePauw RM, Campbell HL, Munro C, Singh A, Hiebert CW, McCartney CA, Sharpe AG, Singh AK, Spaner D, Fowler DB, Ruan Y, Berraies S, Meyer B. Mapping quantitative trait loci associated with leaf rust resistance in five spring wheat populations using single nucleotide polymorphism markers. PLoS One 2020; 15:e0230855. [PMID: 32267842 PMCID: PMC7141615 DOI: 10.1371/journal.pone.0230855] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Accepted: 03/10/2020] [Indexed: 01/27/2023] Open
Abstract
Growing resistant wheat (Triticum aestivum L) varieties is an important strategy for the control of leaf rust, caused by Puccinia triticina Eriks. This study sought to identify the chromosomal location and effects of leaf rust resistance loci in five Canadian spring wheat cultivars. The parents and doubled haploid lines of crosses Carberry/AC Cadillac, Carberry/Vesper, Vesper/Lillian, Vesper/Stettler and Stettler/Red Fife were assessed for leaf rust severity and infection response in field nurseries in Canada near Swift Current, SK from 2013 to 2015, Morden, MB from 2015 to 2017 and Brandon, MB in 2016, and in New Zealand near Lincoln in 2014. The populations were genotyped with the 90K Infinium iSelect assay and quantitative trait loci (QTL) analysis was performed. A high density consensus map generated based on 14 doubled haploid populations and integrating SNP and SSR markers was used to compare QTL identified in different populations. AC Cadillac contributed QTL on chromosomes 2A, 3B and 7B (2 loci), Carberry on 1A, 2B (2 loci), 2D, 4B (2 loci), 5A, 6A, 7A and 7D, Lillian on 4A and 7D, Stettler on 2D and 6B, Vesper on 1B, 1D, 2A, 6B and 7B (2 loci), and Red Fife on 7A and 7B. Lillian contributed to a novel locus QLr.spa-4A, and similarly Carberry at QLr.spa-5A. The discovery of novel leaf rust resistance QTL QLr.spa-4A and QLr.spa-5A, and several others in contemporary Canada Western Red Spring wheat varieties is a tremendous addition to our present knowledge of resistance gene deployment in breeding. Carberry demonstrated substantial stacking of genes which could be supplemented with the genes identified in other cultivars with the expectation of increasing efficacy of resistance to leaf rust and longevity with little risk of linkage drag.
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Affiliation(s)
- Firdissa E Bokore
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, Canada
| | - Ron E. Knox
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, Canada
- * E-mail: (REK); (RDC); (CJP)
| | - Richard D. Cuthbert
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, Canada
- * E-mail: (REK); (RDC); (CJP)
| | - Curtis J. Pozniak
- Department of Plant Sciences, University of Saskatchewan, Saskatoon, Canada
- * E-mail: (REK); (RDC); (CJP)
| | - Brent D. McCallum
- Morden Research and Development Centre, Agriculture and Agri-Food Canada, Morden, Canada
| | - Amidou N’Diaye
- Department of Plant Sciences, University of Saskatchewan, Saskatoon, Canada
| | | | - Heather L. Campbell
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, Canada
| | - Catherine Munro
- Plant and Food Research, Canterbury Agriculture and Science Centre, Lincoln, New Zealand
| | - Arti Singh
- Department of Agronomy, Iowa State University, Ames, IA, United States of America
| | - Colin W. Hiebert
- Morden Research and Development Centre, Agriculture and Agri-Food Canada, Morden, Canada
| | - Curt A. McCartney
- Morden Research and Development Centre, Agriculture and Agri-Food Canada, Morden, Canada
| | - Andrew G. Sharpe
- Global Institute for Food Security, University of Saskatchewan, Saskatoon, Canada
| | - Asheesh K. Singh
- Department of Agronomy, Iowa State University, Ames, IA, United States of America
| | - Dean Spaner
- Department of Agricultural, Food and Nutritional Science, 4–10N Agriculture-Forestry Centre, University of Alberta, Edmonton, Canada
| | - D. B. Fowler
- Department of Plant Sciences, University of Saskatchewan, Saskatoon, Canada
| | - Yuefeng Ruan
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, Canada
| | - Samia Berraies
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, Canada
| | - Brad Meyer
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, Canada
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9
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Hiebert CW, Moscou MJ, Hewitt T, Steuernagel B, Hernández-Pinzón I, Green P, Pujol V, Zhang P, Rouse MN, Jin Y, McIntosh RA, Upadhyaya N, Zhang J, Bhavani S, Vrána J, Karafiátová M, Huang L, Fetch T, Doležel J, Wulff BBH, Lagudah E, Spielmeyer W. Stem rust resistance in wheat is suppressed by a subunit of the mediator complex. Nat Commun 2020; 11:1123. [PMID: 32111840 PMCID: PMC7048732 DOI: 10.1038/s41467-020-14937-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 02/11/2020] [Indexed: 11/18/2022] Open
Abstract
Stem rust is an important disease of wheat that can be controlled using resistance genes. The gene SuSr-D1 identified in cultivar ‘Canthatch’ suppresses stem rust resistance. SuSr-D1 mutants are resistant to several races of stem rust that are virulent on wild-type plants. Here we identify SuSr-D1 by sequencing flow-sorted chromosomes, mutagenesis, and map-based cloning. The gene encodes Med15, a subunit of the Mediator Complex, a conserved protein complex in eukaryotes that regulates expression of protein-coding genes. Nonsense mutations in Med15b.D result in expression of stem rust resistance. Time-course RNAseq analysis show a significant reduction or complete loss of differential gene expression at 24 h post inoculation in med15b.D mutants, suggesting that transcriptional reprogramming at this time point is not required for immunity to stem rust. Suppression is a common phenomenon and this study provides novel insight into suppression of rust resistance in wheat. Stem rust is an important disease of wheat and resistance present in some cultivars can be suppressed by the SuSr-D1 locus. Here the authors show that SuSr-D1 encodes a subunit of the Mediator Complex and that nonsense mutations are sufficient to abolish suppression and confer stem rust resistance.
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Affiliation(s)
- Colin W Hiebert
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada.
| | - Matthew J Moscou
- The Sainsbury Laboratory, University of East Anglia, Norwich Research Park, Norwich, NR4 7UK, UK.
| | - Tim Hewitt
- Plant Breeding Institute Cobbitty, University of Sydney, Private Bag 4011, Narellan, NSW, 2567, Australia.,CSIRO Agriculture & Food, GPO Box 1700, Canberra, ACT, 2601, Australia
| | | | - Inma Hernández-Pinzón
- The Sainsbury Laboratory, University of East Anglia, Norwich Research Park, Norwich, NR4 7UK, UK
| | - Phon Green
- The Sainsbury Laboratory, University of East Anglia, Norwich Research Park, Norwich, NR4 7UK, UK
| | - Vincent Pujol
- Research School of Biology, The Australian National University, Acton, ACT, 2601, Australia
| | - Peng Zhang
- Plant Breeding Institute Cobbitty, University of Sydney, Private Bag 4011, Narellan, NSW, 2567, Australia
| | - Matthew N Rouse
- USDA-ARS, Cereal Disease Laboratory, University of Minnesota, St. Paul, MN, 55108, USA
| | - Yue Jin
- USDA-ARS, Cereal Disease Laboratory, University of Minnesota, St. Paul, MN, 55108, USA
| | - Robert A McIntosh
- Plant Breeding Institute Cobbitty, University of Sydney, Private Bag 4011, Narellan, NSW, 2567, Australia
| | | | - Jianping Zhang
- CSIRO Agriculture & Food, GPO Box 1700, Canberra, ACT, 2601, Australia
| | - Sridhar Bhavani
- CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market, Nairobi, 00621, Kenya
| | - Jan Vrána
- Institute of Experimental Botany, Czech Academy of Sciences, Centre of the Region Haná for Biotechnological and Agricultural Research, Šlechtitelů 31, 779 00, Olomouc, Czech Republic
| | - Miroslava Karafiátová
- Institute of Experimental Botany, Czech Academy of Sciences, Centre of the Region Haná for Biotechnological and Agricultural Research, Šlechtitelů 31, 779 00, Olomouc, Czech Republic
| | - Li Huang
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT, 59717, USA
| | - Tom Fetch
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada
| | - Jaroslav Doležel
- Institute of Experimental Botany, Czech Academy of Sciences, Centre of the Region Haná for Biotechnological and Agricultural Research, Šlechtitelů 31, 779 00, Olomouc, Czech Republic
| | | | - Evans Lagudah
- CSIRO Agriculture & Food, GPO Box 1700, Canberra, ACT, 2601, Australia.
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Kosgey ZC, Edae EA, Dill-Macky R, Jin Y, Bulbula WD, Gemechu A, Macharia G, Bhavani S, Randhawa MS, Rouse MN. Mapping and Validation of Stem Rust Resistance Loci in Spring Wheat Line CI 14275. FRONTIERS IN PLANT SCIENCE 2020; 11:609659. [PMID: 33510752 PMCID: PMC7835402 DOI: 10.3389/fpls.2020.609659] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 12/08/2020] [Indexed: 05/22/2023]
Abstract
Stem rust caused by Puccinia graminis f. sp. tritici (Pgt) remains a constraint to wheat production in East Africa. In this study, we characterized the genetics of stem rust resistance, identified QTLs, and described markers associated with stem rust resistance in the spring wheat line CI 14275. The 113 recombinant inbred lines, together with their parents, were evaluated at the seedling stage against Pgt races TTKSK, TRTTF, TPMKC, TTTTF, and RTQQC. Screening for resistance to Pgt races in the field was undertaken in Kenya, Ethiopia, and the United States in 2016, 2017, and 2018. One gene conferred seedling resistance to race TTTTF, likely Sr7a. Three QTL were identified that conferred field resistance. QTL QSr.cdl-2BS.2, that conferred resistance in Kenya and Ethiopia, was validated, and the marker Excalibur_c7963_1722 was shown to have potential to select for this QTL in marker-assisted selection. The QTL QSr.cdl-3B.2 is likely Sr12, and QSr.cdl-6A appears to be a new QTL. This is the first study to both detect and validate an adult plant stem rust resistance QTL on chromosome arm 2BS. The combination of field QTL QSr.cdl-2BS.2, QSr.cdl-3B.2, and QSr.cdl-6A has the potential to be used in wheat breeding to improve stem rust resistance of wheat varieties.
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Affiliation(s)
- Zennah C. Kosgey
- Kenya Agricultural and Livestock Research Organization, Njoro, Kenya
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN, United States
- *Correspondence: Zennah C. Kosgey,
| | - Erena A. Edae
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN, United States
| | - Ruth Dill-Macky
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN, United States
| | - Yue Jin
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN, United States
- Cereal Disease Laboratory, United States Department of Agriculture-Agricultural Research Service, Saint Paul, MN, United States
| | - Worku Denbel Bulbula
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN, United States
- Debre Zeit Agricultural Research Center, Ethiopian Institute of Agricultural Research, Bishoftu, Ethiopia
| | - Ashenafi Gemechu
- Debre Zeit Agricultural Research Center, Ethiopian Institute of Agricultural Research, Bishoftu, Ethiopia
| | - Godwin Macharia
- Kenya Agricultural and Livestock Research Organization, Njoro, Kenya
| | - Sridhar Bhavani
- International Maize and Wheat Improvement Center (CIMMYT), Texcoco, Mexico
| | | | - Matthew N. Rouse
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN, United States
- Cereal Disease Laboratory, United States Department of Agriculture-Agricultural Research Service, Saint Paul, MN, United States
- Matthew N. Rouse,
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11
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Brar GS, Fetch T, McCallum BD, Hucl PJ, Kutcher HR. Virulence Dynamics and Breeding for Resistance to Stripe, Stem, and Leaf Rust in Canada Since 2000. PLANT DISEASE 2019; 103:2981-2995. [PMID: 31634033 DOI: 10.1094/pdis-04-19-0866-fe] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Wheat (Triticum spp.) is a major field crop in Canada in terms of acreage, annual production, and export market value. There are nine classes of Canadian wheat based on growth habit (winter or spring), kernel hardness (hard or soft), seed coat color (red or white), and quality factors (grain protein content and gluten strength). Wheat was described by Newman in 1928 as "the economic fairy to the industrial and commercial life of Canada, having built practically the whole economic structure of the Prairie Provinces." Wheat production in Canada is affected by several biotic and abiotic stresses. The major abiotic stresses are frost damage, drought, and heat stress. Among biotic stresses, diseases caused by fungal pathogens are the most important although wheat streak mosaic virus (WSMV) has caused some localized outbreaks in some years. In context of cultivar registration in Canada, there are certain diseases that breeders have to take into account while developing resistant cultivars. The Prairie Recommending Committee for Wheat, Rye, and Triticale (PRCWRT) classify wheat diseases into priority one, priority two, and priority three depending on prevalence and potential damage they can cause. However, priority one diseases are more of a concern and a minimum level of resistance in commercial cultivars is recommended for those.
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Affiliation(s)
- Gurcharn S Brar
- Crop Development Centre/Department of Plant Science, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
| | - Thomas Fetch
- Agriculture and Agri-Food Canada - Brandon Research and Development Centre, Brandon, MB R7A 5Y3, Canada
| | - Brent D McCallum
- Agriculture and Agri-Food Canada - Morden Research and Development Centre, Morden, MB R3T 2M9, Canada
| | - Pierre J Hucl
- Crop Development Centre/Department of Plant Science, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
| | - Hadley R Kutcher
- Crop Development Centre/Department of Plant Science, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
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12
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Randhawa MS, Singh RP, Dreisigacker S, Bhavani S, Huerta-Espino J, Rouse MN, Nirmala J, Sandoval-Sanchez M. Identification and Validation of a Common Stem Rust Resistance Locus in Two Bi-parental Populations. FRONTIERS IN PLANT SCIENCE 2018; 9:1788. [PMID: 30555507 PMCID: PMC6283910 DOI: 10.3389/fpls.2018.01788] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Accepted: 11/16/2018] [Indexed: 05/28/2023]
Abstract
Races belonging to Ug99 lineage of stem rust fungus Puccinia graminis f. sp. tritici (Pgt) continue to pose a threat to wheat (Triticum aestivum L.) production in various African countries. Growing resistant varieties is the most economical and environmentally friendly control measure. Recombinant inbred line (RIL) populations from the crosses of susceptible parent 'Cacuke' with the resistant parents 'Huhwa' and 'Yaye' were phenotyped for resistance at the seedling stage to Pgt race TTKSK (Ug99) and in adult plants in field trials at Njoro, Kenya for two seasons in 2016. Using the Affymetrix Axiom breeders SNP array, two stem rust resistance genes, temporarily designated as SrH and SrY, were identified and mapped on chromosome arm 2BL through selective genotyping and bulked segregant analysis (BSA), respectively. Kompetitive allele specific polymorphism (KASP) markers and simple sequence repeat (SSR) markers were used to saturate chromosome arm 2BL in both RIL populations. SrH mapped between markers cim109 and cim114 at a distance of 0.9 cM proximal, and cim117 at 2.9 cM distal. SrY was flanked by markers cim109 and cim116 at 0.8 cM proximal, and IWB45932 at 1.9 cM distal. Two Ug99-effective stem rust resistance genes derived from bread wheat, Sr9h and Sr28, have been reported on chromosome arm 2BL. Infection types and map position in Huhwa and Yaye indicated that Sr28 was absent in both the parents. However, susceptible reactions produced by resistant lines from both populations against Sr9h-virulent race TTKSF+ confirmed the presence of a common resistance locus Sr9h in both lines. Test of allelism is required to establish genetic relationships between genes identified in present study and Sr9h. Marker cim117 linked to SrH was genotyped on set of wheat lines with Huhwa in the pedigree and is advised to be used for marker assisted selection for this gene, however, a combination of phenotypic and genotypic assays is desirable for both genes especially for selection of Sr9h in breeding programs.
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Affiliation(s)
| | - Ravi P. Singh
- International Maize and Wheat Improvement Center (CIMMYT), Mexico City, Mexico
| | | | - Sridhar Bhavani
- International Maize and Wheat Improvement Center (CIMMYT), Mexico City, Mexico
| | | | - Matthew N. Rouse
- Cereal Disease Laboratory, United States Department of Agriculture-Agricultural Research Service, St. Paul, MN, United States
| | - Jayaveeramuthu Nirmala
- Cereal Disease Laboratory, United States Department of Agriculture-Agricultural Research Service, St. Paul, MN, United States
| | - Maricarmen Sandoval-Sanchez
- International Maize and Wheat Improvement Center (CIMMYT), Mexico City, Mexico
- Colegio de Postgraduados, Texcoco, Mexico
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13
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Zurn JD, Rouse MN, Chao S, Aoun M, Macharia G, Hiebert CW, Pretorius ZA, Bonman JM, Acevedo M. Dissection of the multigenic wheat stem rust resistance present in the Montenegrin spring wheat accession PI 362698. BMC Genomics 2018; 19:67. [PMID: 29357813 PMCID: PMC5776780 DOI: 10.1186/s12864-018-4438-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 01/04/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Research to identify and characterize stem rust resistance genes in common wheat, Triticum aestivum, has been stimulated by the emergence of Ug99-lineage races of the wheat stem rust pathogen, Puccinia graminis f. sp. tritici (Pgt), in Eastern Africa. The Montenegrin spring wheat landrace PI 362698 was identified as a source of Pgt resistance. This accession exhibits resistance to multiple Ug99-lineage and North American Pgt races at seedling and adult-plant stages. A recombinant inbred population was developed by crossing the susceptible line LMPG-6 with a single plant selection of PI 362698. A genetic map was constructed using the Illumina iSelect 90 K wheat assay and the markers csLv34, NB-LRR3, and wMAS000003 and quantitative trait locus (QTL) analysis was performed. RESULTS QTL analysis identified five significant QTLs (α = 0.05) on chromosomes 2B, 3B, 6A, 6D, and 7A associated with wheat stem rust resistance. The QTL on chromosome 3B was identified using both field data from Kenya (Pgt Ug99-lineage races) and seedling data from Pgt race MCCF. This QTL potentially corresponds to Sr12 or a new allele of Sr12. The multi-pathogen resistance gene Sr57 located on chromosome 7D is present in PI 362698 according to the diagnostic markers csLv34 and wMAS000003, however a significant QTL was not detected at this locus. The QTLs on chromosomes 2B, 6A, and 6D were identified during seedling trials and are thought to correspond to Sr16, Sr8a, and Sr5, respectively. The QTL identified on chromosome 7A was detected using MCCF seedling data and may be Sr15 or a potentially novel allele of recently detected Ug99 resistance QTLs. CONCLUSIONS The combination of resistance QTLs found in PI 362698 is like the resistance gene combination present in the broadly resistant cultivar Thatcher. As such, PI 362698 may not be a landrace as previously thought. PI 362698 has been crossed with North Dakota wheat germplasm for future breeding efforts. Additional work is needed to fully understand why the combination of genes present in PI 362698 and 'Thatcher' provide such durable resistance.
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Affiliation(s)
- Jason D Zurn
- Department of Plant Pathology, North Dakota State University, Fargo, ND, USA
- USDA-ARS, National Clonal Germplasm Repository, Corvallis, OR, USA
| | - Matthew N Rouse
- USDA-ARS, Cereal Disease Laboratory, and Department of Plant Pathology, University of Minnesota, St. Paul, MN, USA
| | - Shiaoman Chao
- USDA-ARS, Cereal Crops Research Unit, Fargo, ND, USA
| | - Meriem Aoun
- Department of Plant Pathology, North Dakota State University, Fargo, ND, USA
| | - Godwin Macharia
- Kenya Agricultural and Livestock Research Organization, Njoro, Kenya
| | | | - Zacharias A Pretorius
- Department of Plant Sciences, University of the Free State, Bloemfontein, South Africa
| | - J Michael Bonman
- USDA-ARS, Small Grains and Potato Germplasm Research Unit, Aberdeen, ID, USA
| | - Maricelis Acevedo
- Department of Plant Pathology, North Dakota State University, Fargo, ND, USA.
- International Programs, College of Agriculture and Life Sciences, Cornell University, Mann Library B-75, Ithaca, NY, 14853, USA.
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14
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Aktar-Uz-Zaman M, Tuhina-Khatun M, Hanafi MM, Sahebi M. Genetic analysis of rust resistance genes in global wheat cultivars: an overview. BIOTECHNOL BIOTEC EQ 2017. [DOI: 10.1080/13102818.2017.1304180] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- Md Aktar-Uz-Zaman
- Laboratory of Climate-Smart Food Crop Production, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
- Bangladesh Agricultural Research Institute, Gazipur, Bangladesh
| | - Mst Tuhina-Khatun
- Laboratory of Climate-Smart Food Crop Production, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
- Bangladesh Rice Research Institute, Gazipur, Bangladesh
| | - Mohamed Musa Hanafi
- Laboratory of Plantation Science and Technology, Institute of Plantation Studies, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
- Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Mahbod Sahebi
- Laboratory of Climate-Smart Food Crop Production, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
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15
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Babiker EM, Gordon TC, Bonman JM, Chao S, Rouse MN, Jin Y, Newcomb M, Wanyera R, Bhavani S. Genetic Loci Conditioning Adult Plant Resistance to the Ug99 Race Group and Seedling Resistance to Races TRTTF and TTTTF of the Stem Rust Pathogen in Wheat Landrace CItr 15026. PLANT DISEASE 2017; 101:496-501. [PMID: 30677344 DOI: 10.1094/pdis-10-16-1447-re] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Wheat landrace CItr 15026 previously showed adult plant resistance (APR) to the Ug99 stem rust race group in Kenya and seedling resistance to Puccinia graminis f. sp. tritici races QFCSC, TTTTF, and TRTTF. CItr 15026 was crossed to susceptible accessions LMPG-6 and Red Bobs, and 180 double haploid (DH) lines and 140 recombinant inbred lines (RIL), respectively, were developed. The 90K wheat iSelect single-nucleotide polymorphism platform was used to genotype the parents and populations. Parents and 180 DH lines were evaluated in the field in Kenya for three seasons. A major quantitative trait locus (QTL) for APR was consistently detected on chromosome arm 6AS. This QTL was further detected in the RIL population screened in Kenya for one season. Parents, F1, and the two populations were tested as seedlings against races TRTTF and TTTTF. In addition, the DH population was tested against race QFCSC. Goodness-of-fit tests indicated that the TRTTF resistance in CItr 15026 was controlled by two complementary genes whereas the TTTTF and QFCSC resistance was conditioned by one dominant gene. The TRTTF resistance loci mapped to chromosome arms 6AS and 6DS, whereas the TTTTF and QFCSC resistance locus mapped to the same region on 6DS as the TRTTF resistance. The APR identified in CItr 15026 should be useful in developing cultivars with durable stem rust resistance.
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Affiliation(s)
- E M Babiker
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, Aberdeen, ID 83210
| | - T C Gordon
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, Aberdeen, ID 83210
| | - J M Bonman
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, Aberdeen, ID 83210
| | - S Chao
- USDA-ARS, Cereal Crops Research, Fargo, ND 58102
| | - M N Rouse
- USDA-ARS, Cereal Disease Laboratory, St. Paul, MN 55108
| | - Y Jin
- USDA-ARS, Cereal Disease Laboratory, St. Paul, MN 55108
| | - M Newcomb
- School of Plant Sciences, University of Arizona, Maricopa
| | - R Wanyera
- Kenya Agricultural and Livestock Research Organization, Njoro 20107, Kenya
| | - S Bhavani
- International Maize and Wheat Improvement Center, Nairobi, Kenya
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16
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Hiebert CW, Rouse MN, Nirmala J, Fetch T. Genetic Mapping of Stem Rust Resistance to Puccinia graminis f. sp. tritici Race TRTTF in the Canadian Wheat Cultivar Harvest. PHYTOPATHOLOGY 2017; 107:192-197. [PMID: 27705664 DOI: 10.1094/phyto-05-16-0186-r] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Stem rust, caused by Puccinia graminis f. sp. tritici, is a destructive disease of wheat that can be controlled by deploying effective stem rust resistance (Sr) genes. Highly virulent races of P. graminis f. sp. tritici in Africa have been detected and characterized. These include race TRTTF and the Ug99 group of races such as TTKSK. Several Canadian and U.S. spring wheat cultivars, including the widely grown Canadian cultivar 'Harvest', are resistant to TRTTF. However, the genetic basis of resistance to TRTTF in Canadian and U.S. spring wheat cultivars is unknown. The objectives of this study were to determine the number of Sr genes involved in TRTTF resistance in Harvest, genetically map the resistance with DNA markers, and use markers to assess the distribution of that resistance in a panel of Canadian cultivars. A doubled haploid (DH) population was produced from the cross LMPG-6S/Harvest. The DH population was tested with race TRTTF at the seedling stage. Of 92 DH progeny evaluated, 46 were resistant and 46 were susceptible which perfectly fit a 1:1 ratio indicating a single Sr gene was responsible for conferring resistance to TRTTF in Harvest. Mapping with single nucleotide polymorphism (SNP) and simple sequence repeat (SSR) markers placed the resistance gene distally on the chromosome 6AS genetic map, which corresponded to the location reported for Sr8. SSR marker gwm459 and 30 cosegregating SNP markers showed the closest linkage, mapping 2.2 cM proximal to the Sr gene. Gene Sr8a confers resistance to TRTTF and may account for the resistance in Harvest. Testing a panel of Canadian wheat cultivars with four SNP markers closely linked to resistance to TRTTF suggested that the resistance present in Harvest is present in many Canadian cultivars. Two of these SNP markers were also predictive of TRTTF resistance in a panel of 241 spring wheat lines from the United States, Canada, and Mexico.
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Affiliation(s)
- Colin W Hiebert
- First author: Agriculture and Agri-Food Canada, Morden Research and Development Centre, 100, Morden, MB R6M 1Y5, Canada; second and third authors: U.S. Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory and Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108; and fourth author: Agriculture and Agri-Food Canada, Brandon Research and Development Centre, Brandon, MB R7A 5Y3, Canada
| | - Matthew N Rouse
- First author: Agriculture and Agri-Food Canada, Morden Research and Development Centre, 100, Morden, MB R6M 1Y5, Canada; second and third authors: U.S. Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory and Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108; and fourth author: Agriculture and Agri-Food Canada, Brandon Research and Development Centre, Brandon, MB R7A 5Y3, Canada
| | - Jayaveeramuthu Nirmala
- First author: Agriculture and Agri-Food Canada, Morden Research and Development Centre, 100, Morden, MB R6M 1Y5, Canada; second and third authors: U.S. Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory and Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108; and fourth author: Agriculture and Agri-Food Canada, Brandon Research and Development Centre, Brandon, MB R7A 5Y3, Canada
| | - Tom Fetch
- First author: Agriculture and Agri-Food Canada, Morden Research and Development Centre, 100, Morden, MB R6M 1Y5, Canada; second and third authors: U.S. Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory and Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108; and fourth author: Agriculture and Agri-Food Canada, Brandon Research and Development Centre, Brandon, MB R7A 5Y3, Canada
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17
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Babiker EM, Gordon TC, Chao S, Rouse MN, Wanyera R, Acevedo M, Brown-Guedira G, Bonman JM. Molecular Mapping of Stem Rust Resistance Loci Effective Against the Ug99 Race Group of the Stem Rust Pathogen and Validation of a Single Nucleotide Polymorphism Marker Linked to Stem Rust Resistance Gene Sr28. PHYTOPATHOLOGY 2017; 107:208-215. [PMID: 27775500 DOI: 10.1094/phyto-08-16-0294-r] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Wheat landrace PI 177906 has seedling resistance to stem rust caused by Puccinia graminis f. sp. tritici races TTKSK, TTKST, and BCCBC and field resistance to the Ug99 race group. Parents, 140 recombinant inbred lines, and 138 double haploid (DH) lines were evaluated for seedling resistance to races TTKSK and BCCBC. Parents and the DH population were evaluated for field resistance to Ug99 in Kenya. The 90K wheat single nucleotide polymorphism (SNP) genotyping platform was used to genotype the parents and populations. Goodness-of-fit tests indicated that two dominant genes in PI 177906 conditioned seedling resistance to TTKSK. Two major loci for seedling resistance were consistently mapped to the chromosome arms 2BL and 6DS. The BCCBC resistance was mapped to the same location on 2BL as the TTKSK resistance. Using field data from the three seasons, two major QTL were consistently detected at the same regions on 2BL and 6DS. Based on the mapping result, race specificity, and the infection type observed in PI 177906, the TTKSK resistance on 2BL is likely due to Sr28. One SNP marker (KASP_IWB1208) was found to be predictive for the presence of the TTKSK resistance locus on 2BL and Sr28.
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Affiliation(s)
- E M Babiker
- First, second, and eighth authors: U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, 1691 S 2700 W, Aberdeen, ID 83210; third author: USDA-ARS, Cereal Crops Research Unit, 1605 Albrecht Blvd., Fargo, ND 58102; fourth author: USDA-ARS, Cereal Disease Laboratory, 1551 Lindig Ave., St. Paul, MN 55108; fifth author: Kenya Agricultural and Livestock Research Organization, Njoro 20107, Kenya; sixth author: Department of Plant Sciences, North Dakota State University, P.O. Box 6050, Fargo 58108; and seventh author: USDA-ARS, Plant Science Research Unit, Raleigh, NC 27606
| | - T C Gordon
- First, second, and eighth authors: U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, 1691 S 2700 W, Aberdeen, ID 83210; third author: USDA-ARS, Cereal Crops Research Unit, 1605 Albrecht Blvd., Fargo, ND 58102; fourth author: USDA-ARS, Cereal Disease Laboratory, 1551 Lindig Ave., St. Paul, MN 55108; fifth author: Kenya Agricultural and Livestock Research Organization, Njoro 20107, Kenya; sixth author: Department of Plant Sciences, North Dakota State University, P.O. Box 6050, Fargo 58108; and seventh author: USDA-ARS, Plant Science Research Unit, Raleigh, NC 27606
| | - S Chao
- First, second, and eighth authors: U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, 1691 S 2700 W, Aberdeen, ID 83210; third author: USDA-ARS, Cereal Crops Research Unit, 1605 Albrecht Blvd., Fargo, ND 58102; fourth author: USDA-ARS, Cereal Disease Laboratory, 1551 Lindig Ave., St. Paul, MN 55108; fifth author: Kenya Agricultural and Livestock Research Organization, Njoro 20107, Kenya; sixth author: Department of Plant Sciences, North Dakota State University, P.O. Box 6050, Fargo 58108; and seventh author: USDA-ARS, Plant Science Research Unit, Raleigh, NC 27606
| | - M N Rouse
- First, second, and eighth authors: U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, 1691 S 2700 W, Aberdeen, ID 83210; third author: USDA-ARS, Cereal Crops Research Unit, 1605 Albrecht Blvd., Fargo, ND 58102; fourth author: USDA-ARS, Cereal Disease Laboratory, 1551 Lindig Ave., St. Paul, MN 55108; fifth author: Kenya Agricultural and Livestock Research Organization, Njoro 20107, Kenya; sixth author: Department of Plant Sciences, North Dakota State University, P.O. Box 6050, Fargo 58108; and seventh author: USDA-ARS, Plant Science Research Unit, Raleigh, NC 27606
| | - R Wanyera
- First, second, and eighth authors: U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, 1691 S 2700 W, Aberdeen, ID 83210; third author: USDA-ARS, Cereal Crops Research Unit, 1605 Albrecht Blvd., Fargo, ND 58102; fourth author: USDA-ARS, Cereal Disease Laboratory, 1551 Lindig Ave., St. Paul, MN 55108; fifth author: Kenya Agricultural and Livestock Research Organization, Njoro 20107, Kenya; sixth author: Department of Plant Sciences, North Dakota State University, P.O. Box 6050, Fargo 58108; and seventh author: USDA-ARS, Plant Science Research Unit, Raleigh, NC 27606
| | - M Acevedo
- First, second, and eighth authors: U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, 1691 S 2700 W, Aberdeen, ID 83210; third author: USDA-ARS, Cereal Crops Research Unit, 1605 Albrecht Blvd., Fargo, ND 58102; fourth author: USDA-ARS, Cereal Disease Laboratory, 1551 Lindig Ave., St. Paul, MN 55108; fifth author: Kenya Agricultural and Livestock Research Organization, Njoro 20107, Kenya; sixth author: Department of Plant Sciences, North Dakota State University, P.O. Box 6050, Fargo 58108; and seventh author: USDA-ARS, Plant Science Research Unit, Raleigh, NC 27606
| | - G Brown-Guedira
- First, second, and eighth authors: U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, 1691 S 2700 W, Aberdeen, ID 83210; third author: USDA-ARS, Cereal Crops Research Unit, 1605 Albrecht Blvd., Fargo, ND 58102; fourth author: USDA-ARS, Cereal Disease Laboratory, 1551 Lindig Ave., St. Paul, MN 55108; fifth author: Kenya Agricultural and Livestock Research Organization, Njoro 20107, Kenya; sixth author: Department of Plant Sciences, North Dakota State University, P.O. Box 6050, Fargo 58108; and seventh author: USDA-ARS, Plant Science Research Unit, Raleigh, NC 27606
| | - J M Bonman
- First, second, and eighth authors: U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, 1691 S 2700 W, Aberdeen, ID 83210; third author: USDA-ARS, Cereal Crops Research Unit, 1605 Albrecht Blvd., Fargo, ND 58102; fourth author: USDA-ARS, Cereal Disease Laboratory, 1551 Lindig Ave., St. Paul, MN 55108; fifth author: Kenya Agricultural and Livestock Research Organization, Njoro 20107, Kenya; sixth author: Department of Plant Sciences, North Dakota State University, P.O. Box 6050, Fargo 58108; and seventh author: USDA-ARS, Plant Science Research Unit, Raleigh, NC 27606
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Wiersma AT, Brown LK, Brisco EI, Liu TL, Childs KL, Poland JA, Sehgal SK, Olson EL. Fine mapping of the stem rust resistance gene SrTA10187. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2016; 129:2369-2378. [PMID: 27581540 DOI: 10.1007/s00122-016-2776-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Accepted: 08/24/2016] [Indexed: 06/06/2023]
Abstract
SrTA10187 was fine-mapped to a 1.1 cM interval, candidate genes were identified in the region of interest, and molecular markers were developed for marker-assisted selection and Sr gene pyramiding. Stem rust (Puccinia graminis f. sp. tritici, Pgt) races belonging to the Ug99 (TTKSK) race group pose a serious threat to global wheat (Triticum aestivum L.) production. To improve Pgt host resistance, the Ug99-effective resistance gene SrTA10187 previously identified in Aegilops tauschii Coss. was introgressed into wheat, and mapped to the short arm of wheat chromosome 6D. In this study, high-resolution mapping of SrTA10187 was done using a population of 1,060 plants. Pgt resistance was screened using race QFCSC. PCR-based SNP and STS markers were developed from genotyping-by-sequencing tags and SNP sequences available in online databases. SrTA10187 segregated as expected in a 3:1 ratio of resistant to susceptible individuals in three out of six BC3F2 families, and was fine-mapped to a 1.1 cM region on wheat chromosome 6DS. Marker context sequence was aligned to the reference Ae. tauschii genome to identify the physical region encompassing SrTA10187. Due to the size of the corresponding region, candidate disease resistance genes could not be identified with confidence. Comparisons with the Ae. tauschii genetic map developed by Luo et al. (PNAS 110(19):7940-7945, 2013) enabled identification of a discrete genetic locus and a BAC minimum tiling path of the region spanning SrTA10187. Annotation of pooled BAC library sequences led to the identification of candidate genes in the region of interest-including a single NB-ARC-LRR gene. The shorter genetic interval and flanking KASP™ and STS markers developed in this study will facilitate marker-assisted selection, gene pyramiding, and positional cloning of SrTA10187.
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Affiliation(s)
- Andrew T Wiersma
- Department of Plant, Soil and Microbial Sciences, Michigan State University, 1066 Bogue Street, Room A286, East Lansing, MI, 48824, USA
| | - Linda K Brown
- Department of Plant, Soil and Microbial Sciences, Michigan State University, 1066 Bogue Street, Room A286, East Lansing, MI, 48824, USA
| | - Elizabeth I Brisco
- Department of Plant, Soil and Microbial Sciences, Michigan State University, 1066 Bogue Street, Room A286, East Lansing, MI, 48824, USA
| | - Tiffany L Liu
- Department of Plant Biology, Michigan State University, 612 Wilson Rd, Room 166, East Lansing, MI, 48824, USA
| | - Kevin L Childs
- Department of Plant Biology and Center for Genomics-Enabled Plant Science, Michigan State University, 612 Wilson Rd, Room 166, East Lansing, MI, 48824, USA
| | - Jesse A Poland
- Department of Plant Pathology, Wheat Genetics Resource Center, Kansas State University, 4011 Throckmorton Plant Sciences Center, Manhattan, KS, 66506, USA
| | - Sunish K Sehgal
- Department of Plant Science, South Dakota State University, Plant Science-Box 2140C, Brookings, SD, 57007, USA
| | - Eric L Olson
- Department of Plant, Soil and Microbial Sciences, Michigan State University, 1066 Bogue Street, Room A286, East Lansing, MI, 48824, USA.
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19
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Hiebert CW, Kassa MT, McCartney CA, You FM, Rouse MN, Fobert P, Fetch TG. Genetics and mapping of seedling resistance to Ug99 stem rust in winter wheat cultivar Triumph 64 and differentiation of SrTmp, SrCad, and Sr42. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2016; 129:2171-2177. [PMID: 27506534 DOI: 10.1007/s00122-016-2765-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 08/02/2016] [Indexed: 05/20/2023]
Abstract
Resistance to Ug99 stem rust in Triumph 64 was conferred by SrTmp on chromosome arm 6DS and was mapped to the same position as SrCad and Sr42 , however, the three genes show functional differences. Stem rust, caused by Puccinia graminis f. sp. tritici (Pgt), is an important disease of wheat that can be controlled by effective stem rust resistance (Sr) genes. The emergence of virulent Pgt races in Africa, namely Ug99 and its variants, has stimulated the search for new Sr genes and genetic characterization of known sources of resistance. Triumph 64 is a winter wheat cultivar that carries gene SrTmp, which confers resistance to Ug99. The goals of this study were to genetically map SrTmp and examine its relationship with other Sr genes occupying a similar chromosome location. A doubled haploid (DH) population from the cross LMPG-6S/Triumph 64 was inoculated with Ug99 at the seedling stage. A single gene conditioning resistance to Ug99 segregated in the population. Genetic mapping with SSR markers placed SrTmp on chromosome arm 6DS in a region similar to SrCad and Sr42. SNP markers developed for SrCad were used to further map SrTmp and were also added to a genetic map of Sr42 using a DH population (LMPG-6S/Norin 40). Three SNP markers that co-segregated with SrTmp also co-segregated with SrCad and Sr42. The SNP markers showed no difference in the map locations of SrTmp, SrCad, and Sr42. Multi-race testing with DH lines from the Triumph 64 and Norin 40 populations and a recombinant inbred-line population from the cross LMPG-6S/AC Cadillac showed that SrTmp, SrCad, and Sr42 confer different spectra of resistance. Markers closely linked to SrTmp are suitable for marker-assisted breeding and germplasm development.
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Affiliation(s)
- Colin W Hiebert
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100 Morden, Manitoba, R6M 1Y5, Canada.
| | - Mulualem T Kassa
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100 Morden, Manitoba, R6M 1Y5, Canada
- National Research Council, 110 Gymnasium Place, Saskatoon, SK, S7N 0W9, Canada
| | - Curt A McCartney
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100 Morden, Manitoba, R6M 1Y5, Canada
| | - Frank M You
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100 Morden, Manitoba, R6M 1Y5, Canada
| | - Matthew N Rouse
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota Department of Plant Pathology, 1551 Lindig Street, St. Paul, MN, USA
| | - Pierre Fobert
- National Research Council, 110 Gymnasium Place, Saskatoon, SK, S7N 0W9, Canada
| | - Tom G Fetch
- Agriculture and Agri-Food Canada, Brandon Research and Development Centre, Brandon, MB R7A 5Y3, Canada
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20
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Rajagopalan N, Halasz A, Lu Y, Liu E, Monteil-Rivera F, Loewen MC. Probing allocrite preferences of 2 naturally occurring variants of the wheat LR34 ABC transporter. Biochem Cell Biol 2016; 94:459-470. [DOI: 10.1139/bcb-2016-0058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
For almost a century, the wheat Lr34 gene has conferred durable resistance against fungal rust diseases. While sequence homology predicts a putative ATP binding cassette transporter, the molecules that are transported (allocrites) by the encoded LR34 variants, and any associated mechanism of resistance, remain enigmatic. Here, the in vitro transport characteristics of 2 naturally occurring Lr34 variants (that differ in their ability to mediate disease resistance; Lr34sus and Lr34res) are investigated. Initially, a method to express and purify recombinant LR34Sus and LR34Res pseudo half-molecules from Saccharomyces cerevisiae, is described. Subsequently, a semi-targeted chlorophyll catabolite (CC) extraction from Lr34res-expressing wheat plants was performed based on previous reports highlighting increased accumulation of CCs in Lr34res-expressing flag leaves. Following partial biochemical characterization, this extract was applied to an LR34 in vitro proteoliposome transport assay. Mass spectroscopic analyses of transported metabolites revealed that LR34Sus imported a wheat metabolite of 618 Da and that the LR34Res transporter did not. While the identity of the LR34Sus transported metabolite remains to be confirmed and any allocrites of LR34Res remain to be detected, this work demonstrates that these variants have different allocrite preferences, a finding that may be relevant to the mechanism of disease resistance.
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Affiliation(s)
| | - Annamaria Halasz
- National Research Council of Canada, 6100 Royalmount Avenue, Montreal, QC H4P 2R2, Canada
| | - Yuping Lu
- National Research Council of Canada, 110 Gymnasium Place, Saskatoon, SK S7N 0W9, Canada
| | - Enwu Liu
- National Research Council of Canada, 110 Gymnasium Place, Saskatoon, SK S7N 0W9, Canada
| | - Fanny Monteil-Rivera
- National Research Council of Canada, 6100 Royalmount Avenue, Montreal, QC H4P 2R2, Canada
| | - Michele C. Loewen
- National Research Council of Canada, 110 Gymnasium Place, Saskatoon, SK S7N 0W9, Canada
- Department of Biochemistry, University of Saskatchewan, 107 Wiggins Road, Saskatoon, SK S7N 5E5, Canada
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21
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Newcomb M, Olivera PD, Rouse MN, Szabo LJ, Johnson J, Gale S, Luster DG, Wanyera R, Macharia G, Bhavani S, Hodson D, Patpour M, Hovmøller MS, Fetch TG, Jin Y. Kenyan Isolates of Puccinia graminis f. sp. tritici from 2008 to 2014: Virulence to SrTmp in the Ug99 Race Group and Implications for Breeding Programs. PHYTOPATHOLOGY 2016; 106:729-36. [PMID: 27019064 DOI: 10.1094/phyto-12-15-0337-r] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Frequent emergence of new variants in the Puccinia graminis f. sp. tritici Ug99 race group in Kenya has made pathogen survey a priority. We analyzed 140 isolates from 78 P. graminis f. sp. tritici samples collected in Kenya between 2008 and 2014 and identified six races, including three not detected prior to 2013. Genotypic analysis of 20 isolates from 2013 and 2014 collections showed that the new races TTHST, TTKTK, and TTKTT belong to the Ug99 race group. International advanced breeding lines were evaluated against an isolate of TTKTT (Sr31, Sr24, and SrTmp virulence) at the seedling stage. From 169 advanced lines from Kenya, 23% of lines with resistance to races TTKSK and TTKST were susceptible to TTKTT and, from two North American regional nurseries, 44 and 91% of resistant lines were susceptible. Three lines with combined resistance genes were developed to facilitate pathogen monitoring and race identification. These results indicate the increasing virulence and variability in the Kenyan P. graminis f. sp. tritici population and reveal vulnerabilities of elite germplasm to new races.
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Affiliation(s)
- Maria Newcomb
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Pablo D Olivera
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Matthew N Rouse
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Les J Szabo
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Jerry Johnson
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Sam Gale
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Douglas G Luster
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Ruth Wanyera
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Godwin Macharia
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Sridhar Bhavani
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - David Hodson
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Mehran Patpour
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Mogens S Hovmøller
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Thomas G Fetch
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
| | - Yue Jin
- First and second authors: Department of Plant Pathology, University of Minnesota, St. Paul 55108; third, fourth, fifth, sixth, and fifteenth authors: United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Cereal Disease Laboratory, University of Minnesota, St. Paul; seventh author: USDA-ARS Foreign Disease-Weed Science Research Unit, Ft. Detrick, MD 21702; eighth and ninth authors: Kenya Agricultural and Livestock Research Organization, Njoro, Kenya; tenth author: International Maize and Wheat Improvement Center (CIMMYT)-Kenya, Nairobi, Kenya; eleventh author: CIMMYT-Ethiopia, Addis Ababa, Ethiopia; twelfth and thirteenth authors: Aarhus University, Department of Agroecology, Flakkebjerg, DK4200 Slagelse, Denmark; and fourteenth author: Agriculture and Agri-Food Canada, Brandon, Manitoba, Canada
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22
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Kassa MT, You FM, Fetch TG, Fobert P, Sharpe A, Pozniak CJ, Menzies JG, Jordan MC, Humphreys G, Zhu T, Luo MC, McCartney CA, Hiebert CW. Genetic mapping of SrCad and SNP marker development for marker-assisted selection of Ug99 stem rust resistance in wheat. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2016; 129:1373-1382. [PMID: 27091129 DOI: 10.1007/s00122-016-2709-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Accepted: 03/17/2016] [Indexed: 05/09/2023]
Abstract
New SNP markers that can be used for marker-assisted selection and map-based cloning saturate the chromosome region carrying SrCad , a wheat gene that confers resistance to Ug99 stem rust. Wheat stem rust, caused by Puccinia graminis f. sp. tritici, is a devastating disease of wheat worldwide. Development of cultivars with effective resistance has been the primary means to control this disease, but the appearance of new virulent strains such as Ug99 has rendered most wheat varieties vulnerable. The stem rust resistance gene SrCad located on chromosome arm 6DS has provided excellent resistance to various strains of Ug99 in field nurseries conducted in Njoro, Kenya since 2005. Three genetic populations were used to identify SNP markers closely linked to the SrCad locus. Of 220 SNP markers evaluated, 27 were found to be located within a 2 cM region surrounding SrCad. The diagnostic potential of these SNPs was evaluated in a diverse set of 50 wheat lines that were primarily of Canadian origin with known presence or absence of SrCad. Three SNP markers tightly linked proximally to SrCad and one SNP that co-segregated with SrCad were completely predictive of the presence or absence of SrCad. These markers also differentiated SrCad from Sr42 and SrTmp which are also located in the same region of chromosome arm 6DS. These markers should be useful in marker-assisted breeding to develop new wheat varieties containing SrCad-based resistance to Ug99 stem rust.
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Affiliation(s)
- Mulualem T Kassa
- National Research Council, 110 Gymnasium Place, Saskatoon, SK, S7N 0W9, Canada
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada
| | - Frank M You
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada
| | - Tom G Fetch
- Agriculture and Agri-Food Canada, Brandon Research and Development Centre, Brandon, MB, R7A 5Y3, Canada
| | - Pierre Fobert
- National Research Council, 110 Gymnasium Place, Saskatoon, SK, S7N 0W9, Canada
| | - Andrew Sharpe
- National Research Council, 110 Gymnasium Place, Saskatoon, SK, S7N 0W9, Canada
| | - Curtis J Pozniak
- Crop Development Centre, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N 5A8, Canada
| | - James G Menzies
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada
| | - Mark C Jordan
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada
| | - Gavin Humphreys
- Agriculture and Agri-Food Canada, Ottawa Research and Development Centre, 960 Carling Ave., Ottawa, ON, K1A 0C6, Canada
| | - Tingting Zhu
- Department of Plant Sciences, University of California, 276 Hunt Hall and 3111 PES 1 Shields Ave., Davis, CA, 95616, USA
| | - Ming-Cheng Luo
- Department of Plant Sciences, University of California, 276 Hunt Hall and 3111 PES 1 Shields Ave., Davis, CA, 95616, USA
| | - Curt A McCartney
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada
| | - Colin W Hiebert
- Agriculture and Agri-Food Canada, Morden Research and Development Centre, 101 Route 100, Morden, MB, R6M 1Y5, Canada.
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Hiebert CW, Kolmer JA, McCartney CA, Briggs J, Fetch T, Bariana H, Choulet F, Rouse MN, Spielmeyer W. Major Gene for Field Stem Rust Resistance Co-Locates with Resistance Gene Sr12 in 'Thatcher' Wheat. PLoS One 2016; 11:e0157029. [PMID: 27309724 PMCID: PMC4911119 DOI: 10.1371/journal.pone.0157029] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 05/24/2016] [Indexed: 11/19/2022] Open
Abstract
Stem rust, caused by Puccinia graminis (Pgt), is a damaging disease of wheat that can be controlled by utilizing effective stem rust resistance genes. 'Thatcher' wheat carries complex resistance to stem rust that is enhanced in the presence of the resistance gene Lr34. The purpose of this study was to examine APR in 'Thatcher' and look for genetic interactions with Lr34. A RIL population was tested for stem rust resistance in field nurseries in Canada, USA, and Kenya. BSA was used to find SNP markers associated with reduced stem rust severity. A major QTL was identified on chromosome 3BL near the centromere in all environments. Seedling testing showed that Sr12 mapped to the same region as the QTL for APR. The SNP markers were physically mapped and the region carrying the resistance was searched for sequences with homology to members of the NB-LRR resistance gene family. SNP marker from one NB-LRR-like sequence, NB-LRR3 co-segregated with Sr12. Two additional populations, including one that lacked Lr34, were tested in field nurseries. NB-LRR3 mapped near the maximum LOD for reduction in stem rust severity in both populations. Lines from a population that segregated for Sr12 and Lr34 were tested for seedling Pgt biomass and infection type, as well as APR to field stem rust which showed an interaction between the genes. We concluded that Sr12, or a gene closely linked to Sr12, was responsible for 'Thatcher'-derived APR in several environments and this resistance was enhanced in the presence of Lr34.
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Affiliation(s)
- Colin W. Hiebert
- Agriculture and Agri-Food Canada, Cereal Research Centre, Morden, Manitoba, Canada
| | - James A. Kolmer
- Department of Plant Pathology, University of Minnesota, Saint Paul, Minnesota, United States of America
- United States Department of Agriculture–Agriculture Research Service, Cereal Disease Laboratory, Saint Paul, Minnesota, United States of America
| | - Curt A. McCartney
- Agriculture and Agri-Food Canada, Cereal Research Centre, Morden, Manitoba, Canada
| | - Jordan Briggs
- Department of Plant Pathology, University of Minnesota, Saint Paul, Minnesota, United States of America
| | - Tom Fetch
- Agriculture and Agri-Food Canada, Brandon Research Centre, Brandon, Manitoba, Canada
| | - Harbans Bariana
- Plant Breeding Institute, University of Sydney, Cobbitty, New South Wales, Australia
| | - Frederic Choulet
- INRA UMR1095 Genetics, Diversity and Ecophysiology of Cereals, Clermont-Ferrand, France
| | - Matthew N. Rouse
- Department of Plant Pathology, University of Minnesota, Saint Paul, Minnesota, United States of America
- United States Department of Agriculture–Agriculture Research Service, Cereal Disease Laboratory, Saint Paul, Minnesota, United States of America
| | - Wolfgang Spielmeyer
- Commonwealth Scientific and Industrial Research Organisation—Agriculture and Food, Canberra, Australian Capital Territory, Australia
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24
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Babiker EM, Gordon TC, Bonman JM, Chao S, Rouse MN, Brown-Guedira G, Williamson S, Pretorius ZA. Rapid Identification of Resistance Loci Effective Against Puccinia graminis f. sp. tritici Race TTKSK in 33 Spring Wheat Landraces. PLANT DISEASE 2016; 100:331-336. [PMID: 30694146 DOI: 10.1094/pdis-04-15-0466-re] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Wheat breeders worldwide are seeking new sources of resistance to Puccinia graminis f. sp. tritici race TTKSK. To prioritize field-resistant landraces for follow-up genetic studies to test for the presence of new resistance genes, seedling response to P. graminis f. sp. tritici race TTKSK, molecular markers linked to specific Sr genes, segregation ratios among progeny from crosses, and bulked segregant analyses (BSA) were used. In total, 33 spring wheat landraces with seedling resistance to P. graminis f. sp. tritici race TTKSK were crossed to a susceptible genotype, LMPG-6. The segregation ratios of stem rust reactions in F2 seedlings fit a single dominant gene model in 31 populations and progeny from two crosses gave ambiguous results. Using the 90K wheat single-nucleotide polymorphism genotyping platform, BSA showed that the seedling resistance in 29 accessions is probably controlled by loci on chromosome 2BL. For the three remaining accessions, BSA revealed that the seedling resistance is most likely controlled by previously unreported genes. For confirmation, two populations were advanced to the F2:3 and screened against P. graminis f. sp. tritici race TTKSK. Segregation of the F2:3 families fit a 1:2:1 ratio for a single dominant gene. Using the F2:3 families, BSA located the TTKSK locus on chromosome 6DS to the same location as Sr42.
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Affiliation(s)
- E M Babiker
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, Aberdeen, ID 83210
| | - T C Gordon
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, Aberdeen, ID 83210
| | - J M Bonman
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Small Grains and Potato Germplasm Research Unit, Aberdeen, ID 83210
| | - S Chao
- USDA-ARS, Cereal Crops Research, Fargo, ND 58102
| | - M N Rouse
- USDA-ARS, Cereal Disease Laboratory, St. Paul, MN 55108
| | | | - S Williamson
- Department of Crop Science, North Carolina State University, Raleigh 27695
| | - Z A Pretorius
- Department of Plant Sciences, University of the Free State, Bloemfontein 9300, South Africa
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25
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Singh A, Knox RE, DePauw RM, Singh AK, Cuthbert RD, Kumar S, Campbell HL. Genetic mapping of common bunt resistance and plant height QTL in wheat. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2016; 129:243-56. [PMID: 26520114 DOI: 10.1007/s00122-015-2624-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Accepted: 10/17/2015] [Indexed: 05/03/2023]
Abstract
KEY MESSAGE Breeding for field resistance to common bunt in wheat will need to account for multiple genes and epistatic and QTL by environment interactions. Loci associated with quantitative resistance to common bunt are co-localized with other beneficial traits including plant height and rust resistance. ABSTRACT Common bunt, also known as stinking smut, is caused by seed borne fungi Tilletia tritici (Bjerk.) Wint. [syn. Tilletia caries (DC.) Tul.] and Tilletia laevis Kühn [syn. Tilletia foetida (Wallr.) Liro.]. Common bunt is known to cause grain yield and quality losses in wheat due to bunt ball formation and infestation of the grain. The objectives of this research were to identify and map quantitative trait loci (QTL) for common bunt resistance, to study the epistatic interactions between the identified QTL, and investigate the co-localization of bunt resistance with plant height. A population of 261 doubled haploid lines from the cross Carberry/AC Cadillac and checks were genotyped with polymorphic genome wide microsatellite and DArT(®) markers. The lines were grown in 2011, 2012, and 2013 in separate nurseries for common bunt incidence and height evaluation. AC Cadillac contributed a QTL (QCbt.spa-6D) for common bunt resistance on chromosome 6D at markers XwPt-1695, XwPt-672044, and XwPt-5114. Carberry contributed QTL for bunt resistance on chromosomes 1B (QCbt.spa-1B at XwPt743523) 4B (QCbt.spa-4B at XwPt-744434-Xwmc617), 4D (QCbt.spa-4D at XwPt-9747), 5B (QCbt.spa-5B at XtPt-3719) and 7D (QCbt.spa-7D at Xwmc273). Significant epistatic interactions were identified for percent bunt incidence between QCbt.spa-1B × QCbt.spa-4B and QCbt.spa-1B × QCbt.spa-6D, and QTL by environment interaction between QCbt.spa-1B × QCbt.spa-6D. Plant height QTL were found on chromosomes 4B (QPh.spa-4B) and 6D (QPh.spa-6D) that co-located with bunt resistance QTL. The identification of previously unreported common bunt resistance QTL (on chromosomes 4B, 4D and 7D), and new understanding of QTL × QTL interactions will facilitate marker-assisted breeding for common bunt resistance.
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Affiliation(s)
- Arti Singh
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada.
- Department of Agronomy, Iowa State University, Ames, IA, 50011, USA.
| | - Ron E Knox
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada.
| | - R M DePauw
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada
| | - A K Singh
- Department of Agronomy, Iowa State University, Ames, IA, 50011, USA
| | - R D Cuthbert
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada
| | - S Kumar
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada
| | - H L Campbell
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada
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26
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Bajgain P, Rouse MN, Bulli P, Bhavani S, Gordon T, Wanyera R, Njau PN, Legesse W, Anderson JA, Pumphrey MO. Association mapping of North American spring wheat breeding germplasm reveals loci conferring resistance to Ug99 and other African stem rust races. BMC PLANT BIOLOGY 2015; 15:249. [PMID: 26467989 PMCID: PMC4606553 DOI: 10.1186/s12870-015-0628-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 09/28/2015] [Indexed: 05/03/2023]
Abstract
BACKGROUND The recently identified Puccinia graminis f. sp. tritici (Pgt) race TTKSK (Ug99) poses a severe threat to global wheat production because of its broad virulence on several widely deployed resistance genes. Additional virulences have been detected in the Ug99 group of races, and the spread of this race group has been documented across wheat growing regions in Africa, the Middle East (Yemen), and West Asia (Iran). Other broadly virulent Pgt races, such as TRTTF and TKTTF, present further difficulties in maintaining abundant genetic resistance for their effective use in wheat breeding against this destructive fungal disease of wheat. In an effort to identify loci conferring resistance to these races, a genome-wide association study was carried out on a panel of 250 spring wheat breeding lines from the International Maize and Wheat Improvement Center (CIMMYT), six wheat breeding programs in the United States and three wheat breeding programs in Canada. RESULTS The lines included in this study were grouped into two major clusters, based on the results of principal component analysis using 23,976 SNP markers. Upon screening for adult plant resistance (APR) to Ug99 during 2013 and 2014 in artificial stem rust screening nurseries at Njoro, Kenya and at Debre Zeit, Ethiopia, several wheat lines were found to exhibit APR. The lines were also screened for resistance at the seedling stage against races TTKSK, TRTTF, and TKTTF at USDA-ARS Cereal Disease Laboratory in St. Paul, Minnesota; and only 9 of the 250 lines displayed seedling resistance to all the races. Using a mixed linear model, 27 SNP markers associated with APR against Ug99 were detected, including markers linked with the known APR gene Sr2. Using the same model, 23, 86, and 111 SNP markers associated with seedling resistance against races TTKSK, TRTTF, and TKTTF were identified, respectively. These included markers linked to the genes Sr8a and Sr11 providing seedling resistance to races TRTTF and TKTTF, respectively. We also identified putatively novel Sr resistance genes on chromosomes 3B, 4D, 5A, 5B, 6A, 7A, and 7B. CONCLUSION Our results demonstrate that the North American wheat breeding lines have several resistance loci that provide APR and seedling resistance to highly virulent Pgt races. Using the resistant lines and the SNP markers identified in this study, marker-assisted resistance breeding can assist in development of varieties with elevated levels of resistance to virulent stem rust races including TTKSK.
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Affiliation(s)
- P Bajgain
- Department of Agronomy, Purdue University, 915 West State Street, West Lafayette, IN, 47907, USA.
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108, USA.
| | - M N Rouse
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Cereal Disease Laboratory, St. Paul, MN, 55108, USA.
- Department of Plant Pathology, University of Minnesota, St. Paul, MN, 55108, USA.
| | - P Bulli
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164, USA.
| | - S Bhavani
- International Maize and Wheat Improvement Center (CIMMYT), ICRAF House, United Nations Avenue, Gigiri, Nairobi, Kenya.
| | - T Gordon
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Aberdeen, ID, 83210, USA.
| | - R Wanyera
- Kenya Agricultural and Livestock Research Organization (KALRO), Njoro, Kenya.
| | - P N Njau
- Kenya Agricultural and Livestock Research Organization (KALRO), Njoro, Kenya.
| | - W Legesse
- Ethiopian Institute of Agricultural Research (EIAR), Pawe, Ethiopia.
| | - J A Anderson
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108, USA.
| | - M O Pumphrey
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164, USA.
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27
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Singh RP, Hodson DP, Jin Y, Lagudah ES, Ayliffe MA, Bhavani S, Rouse MN, Pretorius ZA, Szabo LJ, Huerta-Espino J, Basnet BR, Lan C, Hovmøller MS. Emergence and Spread of New Races of Wheat Stem Rust Fungus: Continued Threat to Food Security and Prospects of Genetic Control. PHYTOPATHOLOGY 2015; 105:872-84. [PMID: 26120730 DOI: 10.1094/phyto-01-15-0030-fi] [Citation(s) in RCA: 181] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Race Ug99 (TTKSK) of Puccinia graminis f. sp. tritici, detected in Uganda in 1998, has been recognized as a serious threat to food security because it possesses combined virulence to a large number of resistance genes found in current widely grown wheat (Triticum aestivum) varieties and germplasm, leading to its potential for rapid spread and evolution. Since its initial detection, variants of the Ug99 lineage of stem rust have been discovered in Eastern and Southern African countries, Yemen, Iran, and Egypt. To date, eight races belonging to the Ug99 lineage are known. Increased pathogen monitoring activities have led to the identification of other races in Africa and Asia with additional virulence to commercially important resistance genes. This has led to localized but severe stem rust epidemics becoming common once again in East Africa due to the breakdown of race-specific resistance gene SrTmp, which was deployed recently in the 'Digalu' and 'Robin' varieties in Ethiopia and Kenya, respectively. Enhanced research in the last decade under the umbrella of the Borlaug Global Rust Initiative has identified various race-specific resistance genes that can be utilized, preferably in combinations, to develop resistant varieties. Research and development of improved wheat germplasm with complex adult plant resistance (APR) based on multiple slow-rusting genes has also progressed. Once only the Sr2 gene was known to confer slow rusting APR; now, four more genes-Sr55, Sr56, Sr57, and Sr58-have been characterized and additional quantitative trait loci identified. Cloning of some rust resistance genes opens new perspectives on rust control in the future through the development of multiple resistance gene cassettes. However, at present, disease-surveillance-based chemical control, large-scale deployment of new varieties with multiple race-specific genes or adequate levels of APR, and reducing the cultivation of susceptible varieties in rust hot-spot areas remains the best stem rust management strategy.
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Affiliation(s)
- Ravi P Singh
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - David P Hodson
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Yue Jin
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Evans S Lagudah
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Michael A Ayliffe
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Sridhar Bhavani
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Matthew N Rouse
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Zacharias A Pretorius
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Les J Szabo
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Julio Huerta-Espino
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Bhoja R Basnet
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Caixia Lan
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
| | - Mogens S Hovmøller
- First, eleventh, and twelfth authors: International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal, 6-641, 06600, Mexico, D.F.; second author: CIMMYT, Addis Ababa, Ethiopia; third, seventh, and ninth authors: United States Department of Agriculture-Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108; fourth and fifth authors: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia; sixth author: CIMMYT, ICRAF House, United Nations Avenue, Gigiri, Village Market-00621, Nairobi, Kenya; eighth author: University of the Free State, Bloemfontein 9300, South Africa; tenth author: Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo de México, México; and thirteenth author: Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark
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Basnet BR, Singh S, Lopez-Vera EE, Huerta-Espino J, Bhavani S, Jin Y, Rouse MN, Singh RP. Molecular Mapping and Validation of SrND643: A New Wheat Gene for Resistance to the Stem Rust Pathogen Ug99 Race Group. PHYTOPATHOLOGY 2015; 105:470-6. [PMID: 25870921 DOI: 10.1094/phyto-01-14-0016-r] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This study reports the identification of a new gene conferring resistance to the Ug99 lineage of races of Puccinia graminis f. sp. tritici in wheat (Triticum aestivum L.). Because the virulent races of stem rust pathogen continue to pose a serious threat in global wheat production, identification and molecular characterization of new resistance genes remains of utmost important to enhance resistance diversity and durability in wheat germplasm. Advanced wheat breeding line 'ND643/2*Weebill1' carries a stem rust resistance gene, temporarily designated as SrND643, effective against the Ug99 group of P. graminis f. sp. tritici races at both seedling and adult growth stages. This study was conducted to map the chromosomal location of SrND643 and identify closely linked molecular markers to allow its selection in breeding populations. In total, 123 recombinant inbred lines, developed by crossing ND643/2*Weebill1 with susceptible line 'Cacuke', were evaluated for stem rust response in field nurseries at Njoro, Kenya, during two growing seasons in 2010, and were genotyped with DNA markers, including Diversity Arrays Technology, simple sequence repeats (SSR), and single-nucleotide polymorphisms. Linkage mapping tagged SrND643 at the distal end of chromosome 4AL, showing close association with SSR markers Xgwm350 (0.5 centimorgans [cM]), Xwmc219 (4.1 cM), and Xwmc776 (2.9 cM). The race specificity of SrND643 is different from that of Sr7a and Sr7b, indicating that the resistance is conferred by a gene at a new locus or by a new allele of Sr7. The flanking markers Xgwm350 and Xwmc219 were predictive of the presence of SrND643 in advanced germplasm, thus validating the map location and their use in marker-assisted selection.
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Affiliation(s)
- Bhoja R Basnet
- First, second, third, and eighth authors: International Maize and Wheat Improvement Center (CIMMYT), Mexico D.F. 06600, Mexico; third author: CINVESTAV-IPN, Col. San Pedro Zacatenco, Mexico D.F. 07360, Mexico; fourth author: INIFAP CEVAMEX, Chapingo 56230, Edo. Mexico, Mexico; fifth author: CIMMYT, Nairobi, Kenya; and sixth and seventh authors: United States Department of Agriculture-Agricultural Research Service Cereal Disease Laboratory, St. Paul, MN 55108
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Yu G, Zhang Q, Friesen TL, Rouse MN, Jin Y, Zhong S, Rasmussen JB, Lagudah ES, Xu SS. Identification and mapping of Sr46 from Aegilops tauschii accession CIae 25 conferring resistance to race TTKSK (Ug99) of wheat stem rust pathogen. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2015; 128:431-43. [PMID: 25523501 DOI: 10.1007/s00122-014-2442-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 12/06/2014] [Indexed: 05/28/2023]
Abstract
Mapping studies confirm that resistance to Ug99 race of stem rust pathogen in Aegilops tauschii accession Clae 25 is conditioned by Sr46 and markers linked to the gene were developed for marker-assisted selection. The race TTKSK (Ug99) of Puccinia graminis f. sp. tritici, the causal pathogen for wheat stem rust, is considered as a major threat to global wheat production. To address this threat, researchers across the world have been devoted to identifying TTKSK-resistant genes. Here, we report the identification and mapping of a stem rust resistance gene in Aegilops tauschii accession CIae 25 that confers resistance to TTKSK and the development of molecular markers for the gene. An F2 population of 710 plants from an Ae. tauschii cross CIae 25 × AL8/78 were first evaluated against race TPMKC. A set of 14 resistant and 116 susceptible F2:3 families from the F2 plants were then evaluated for their reactions to TTKSK. Based on the tests, 179 homozygous susceptible F2 plants were selected as the mapping population to identify the simple sequence repeat (SSR) and sequence tagged site (STS) markers linked to the gene by bulk segregant analysis. A dominant stem rust resistance gene was identified and mapped with 16 SSR and five new STS markers to the deletion bin 2DS5-0.47-1.00 of chromosome arm 2DS in which Sr46 was located. Molecular marker and stem rust tests on CIae 25 and two Ae. tauschii accessions carrying Sr46 confirmed that the gene in CIae 25 is Sr46. This study also demonstrated that Sr46 is temperature-sensitive being less effective at low temperatures. The marker validation indicated that two closely linked markers Xgwm210 and Xwmc111 can be used for marker-assisted selection of Sr46 in wheat breeding programs.
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Affiliation(s)
- Guotai Yu
- Department of Plant Pathology, North Dakota State University, Fargo, ND, 58108, USA
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Rouse MN, Talbert LE, Singh D, Sherman JD. Complementary epistasis involving Sr12 explains adult plant resistance to stem rust in Thatcher wheat (Triticum aestivum L.). TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2014; 127:1549-59. [PMID: 24838645 DOI: 10.1007/s00122-014-2319-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Accepted: 04/24/2014] [Indexed: 05/20/2023]
Abstract
Quantitative trait loci conferring adult plant resistance to Ug99 stem rust in Thatcher wheat display complementary gene action suggesting multiple quantitative trait loci are needed for effective resistance. Adult plant resistance (APR) in wheat (Triticum aestivum L.) to stem rust, caused by Puccinia graminis f. sp. tritici (Pgt), is desirable because this resistance can be Pgt race non-specific. Resistance derived from cultivar Thatcher can confer high levels of APR to the virulent Pgt race TTKSK (Ug99) when combined with stem rust resistance gene Sr57 (Lr34). To identify the loci conferring APR in Thatcher, we evaluated 160 RILs derived from Thatcher crossed to susceptible cultivar McNeal for field stem rust reaction in Kenya for two seasons and in St. Paul for one season. All RILs and parents were susceptible as seedlings to race TTKSK. However, adult plant stem rust severities in Kenya varied from 5 to 80 %. Composite interval mapping identified four quantitative trait loci (QTL). Three QTL were inherited from Thatcher and one, Sr57, was inherited from McNeal. The markers closest to the QTL peaks were used in an ANOVA to determine the additive and epistatic effects. A QTL on 3BS was detected in all three environments and explained 27-35 % of the variation. The peak of this QTL was at the same location as the Sr12 seedling resistance gene effective to race SCCSC. Epistatic interactions were significant between Sr12 and QTL on chromosome arms 1AL and 2BS. Though Sr12 cosegregated with the largest effect QTL, lines with Sr12 were not always resistant. The data suggest that Sr12 or a linked gene, though not effective to race TTKSK alone, confers APR when combined with other resistance loci.
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Affiliation(s)
- Matthew N Rouse
- Cereal Disease Laboratory, United States Department of Agriculture-Agricultural Research Service (USDA-ARS), 1551 Lindig Street, St. Paul, MN, 55108, USA,
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Yu LX, Barbier H, Rouse MN, Singh S, Singh RP, Bhavani S, Huerta-Espino J, Sorrells ME. A consensus map for Ug99 stem rust resistance loci in wheat. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2014; 127:1561-81. [PMID: 24903979 PMCID: PMC4072096 DOI: 10.1007/s00122-014-2326-7] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Accepted: 05/05/2014] [Indexed: 05/07/2023]
Abstract
This consensus map of stem rust genes, QTLs, and molecular markers will facilitate the identification of new resistance genes and provide a resource of in formation for development of new markers for breeding wheat varieties resistant to Ug99. The global effort to identify new sources of resistance to wheat stem rust, caused by Puccinia graminis f. sp. tritici race group Ug99 has resulted in numerous studies reporting both qualitative genes and quantitative trait loci. The purpose of our study was to assemble all available information on loci associated with stem rust resistance from 21 recent studies on Triticum aestivum L. (bread wheat) and Triticum turgidum subsp. durum desf. (durum wheat). The software LPmerge was used to construct a stem rust resistance loci consensus wheat map with 1,433 markers incorporating Single Nucleotide Polymorphism, Diversity Arrays Technology, Genotyping-by-Sequencing as well as Simple Sequence Repeat marker information. Most of the markers associated with stem rust resistance have been identified in more than one population. Several loci identified in these populations map to the same regions with known Sr genes including Sr2, SrND643, Sr25 and Sr57 (Lr34/Yr18/Pm38), while other significant markers were located in chromosome regions where no Sr genes have been previously reported. This consensus map provides a comprehensive source of information on 141 stem rust resistance loci conferring resistance to stem rust Ug99 as well as linked markers for use in marker-assisted selection.
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Affiliation(s)
- Long-Xi Yu
- Department of Plant Breeding and Genetics, Cornell University, Ithaca, NY 14853 USA
- Present Address: United States Department of Agriculture, Agricultural Research Service, Vegetable and Forage Crops Research Unit, 24106 N. Bunn Road, Prosser, WA 99350–9687 USA
| | - Hugues Barbier
- Department of Plant Breeding and Genetics, Cornell University, Ithaca, NY 14853 USA
| | - Matthew N. Rouse
- United States Department of Agriculture, Agricultural Research Service, Cereal Disease Laboratory and Department of Plant Pathology, University of Minnesota, St. Paul, Minneapolis, MN 55108 USA
| | - Sukhwinder Singh
- International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, 06600 Texcoco, Mexico
| | - Ravi P. Singh
- International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, 06600 Texcoco, Mexico
| | - Sridhar Bhavani
- International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, 06600 Texcoco, Mexico
| | - Julio Huerta-Espino
- Campo Experimental Valle de México INIFAP, Apdo. Postal 10, 56230 Chapingo, Edo de México Mexico
| | - Mark E. Sorrells
- Department of Plant Breeding and Genetics, Cornell University, Ithaca, NY 14853 USA
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Lopez-Vera EE, Nelson S, Singh RP, Basnet BR, Haley SD, Bhavani S, Huerta-Espino J, Xoconostle-Cazares BG, Ruiz-Medrano R, Rouse MN, Singh S. Resistance to stem rust Ug99 in six bread wheat cultivars maps to chromosome 6DS. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2014; 127:231-9. [PMID: 24121568 DOI: 10.1007/s00122-013-2212-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 10/04/2013] [Indexed: 05/20/2023]
Abstract
Identified SSR markers ( Xcfd49 and Xbarc183 ) linked with stem rust resistance for efficient use in marker-assisted selection and stacking of resistance genes in wheat breeding programs. More than 80 % of the worldwide wheat (Triticum aestivum L.) area is currently sown with varieties susceptible to the Ug99 race group of stem rust fungus. However, wheat lines Niini, Tinkio, Coni, Pfunye, Blouk, and Ripper have demonstrated Ug99 resistance at the seedling and adult plant stages. We mapped stem rust resistance in populations derived from crosses of a susceptible parent with each of the resistant lines. The segregation of resistance in each population indicated the presence of a single gene. The resistance gene in Niini mapped to short arm of chromosome 6D and was flanked by SSR markers Xcfd49 at distances of 3.9 cM proximal and Xbarc183 8.4 cM distal, respectively. The chromosome location of this resistance was validated in three other populations: PBW343/Coni, PBW343/Tinkio, and Cacuke/Pfunye. Resistance initially postulated to be conferred by the SrTmp gene in Blouk and Ripper was also linked to Xcfd49 and Xbarc183 on 6DS, but it was mapped proximal to Xbarc183 at a similar position to previously mapped genes Sr42 and SrCad. Based on the variation in diagnostic marker alleles, it is possible that Niini and Pfunye may carry different resistance genes/alleles. Further studies are needed to determine the allelic relationships between various genes located on chromosome arm 6DS. Our results provide valuable molecular marker and genetic information for developing Ug99 resistant wheat varieties in diverse germplasm and using these markers to tag the resistance genes in wheat breeding.
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Olson EL, Rouse MN, Pumphrey MO, Bowden RL, Gill BS, Poland JA. Introgression of stem rust resistance genes SrTA10187 and SrTA10171 from Aegilops tauschii to wheat. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2013; 126:2477-84. [PMID: 23864229 DOI: 10.1007/s00122-013-2148-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Accepted: 06/18/2013] [Indexed: 05/09/2023]
Abstract
Aegilops tauschii, the diploid progenitor of the wheat D genome, is a readily accessible germplasm pool for wheat breeding as genes can be transferred to elite wheat cultivars through direct hybridization followed by backcrossing. Gene transfer and genetic mapping can be integrated by developing mapping populations during backcrossing. Using direct crossing, two genes for resistance to the African stem rust fungus race TTKSK (Ug99), were transferred from the Ae. tauschii accessions TA10187 and TA10171 to an elite hard winter wheat line, KS05HW14. BC2 mapping populations were created concurrently with developing advanced backcross lines carrying rust resistance. Bulked segregant analysis on the BC2 populations identified marker loci on 6DS and 7DS linked to stem rust resistance genes transferred from TA10187 and TA10171, respectively. Linkage maps were developed for both genes and closely linked markers reported in this study will be useful for selection and pyramiding with other Ug99-effective stem rust resistance genes. The Ae. tauschii-derived resistance genes were temporarily designated SrTA10187 and SrTA10171 and will serve as valuable resources for stem rust resistance breeding.
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Affiliation(s)
- Eric L Olson
- Department of Plant Pathology, Kansas State University, Manhattan, KS, 66506, USA
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Singh A, Knox RE, DePauw RM, Singh AK, Cuthbert RD, Campbell HL, Singh D, Bhavani S, Fetch T, Clarke F. Identification and mapping in spring wheat of genetic factors controlling stem rust resistance and the study of their epistatic interactions across multiple environments. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2013; 126:1951-64. [PMID: 23649649 PMCID: PMC3723980 DOI: 10.1007/s00122-013-2109-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Accepted: 04/20/2013] [Indexed: 05/18/2023]
Abstract
Stem rust (Puccinia graminis f. sp. tritici) is responsible for major production losses in hexaploid wheat (Triticum aestivum L.) around the world. The spread of stem rust race Ug99 and variants is a threat to worldwide wheat production and efforts are ongoing to identify and incorporate resistance. The objectives of this research were to identify quantitative trait loci (QTL) and to study their epistatic interactions for stem rust resistance in a population derived from the Canadian wheat cultivars AC Cadillac and Carberry. A doubled haploid (DH) population was developed and genotyped with DArT(®) and SSR markers. The parents and DH lines were phenotyped for stem rust severity and infection response to Ug99 and variant races in 2009, 2010 and 2011 in field rust nurseries near Njoro, Kenya, and to North American races in 2011 and 2012 near Swift Current, SK, Canada. Seedling infection type to race TTKSK was assessed in a bio-containment facility in 2009 and 2012 near Morden, MB. Eight QTL for stem rust resistance and three QTL for pseudo-black chaff on nine wheat chromosomes were identified. The phenotypic variance (PV) explained by the stem rust resistance QTL ranged from 2.4 to 48.8 %. AC Cadillac contributed stem rust resistance QTL on chromosomes 2B, 3B, 5B, 6D, 7B and 7D. Carberry contributed resistance QTL on 4B and 5A. Epistatic interactions were observed between loci on 4B and 5B, 4B and 7B, 6D and 3B, 6D and 5B, and 6D and 7B. The stem rust resistance locus on 6D interacted synergistically with 5B to improve the disease resistance through both crossover and non-crossover interactions depending on the environment. Results from this study will assist in planning breeding for stem rust resistance by maximizing QTL main effects and epistatic interactions.
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Affiliation(s)
- A. Singh
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK S9H 3X2 Canada
| | - R. E. Knox
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK S9H 3X2 Canada
| | - R. M. DePauw
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK S9H 3X2 Canada
| | - A. K. Singh
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK S9H 3X2 Canada
| | - R. D. Cuthbert
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK S9H 3X2 Canada
| | - H. L. Campbell
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK S9H 3X2 Canada
| | - D. Singh
- University of Sydney Plant Breeding Institute Cobbitty, Private Bag 4011, Narellan, 2567 NSW Australia
| | | | - T. Fetch
- Cereal Research Center, Agriculture and Agri-Food Canada, Winnipeg, MBT R3T 2M9 Canada
| | - F. Clarke
- Semiarid Prairie Agricultural Research Center, Agriculture and Agri-Food Canada, Swift Current, SK S9H 3X2 Canada
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Ghazvini H, Hiebert CW, Thomas JB, Fetch T. Development of a multiple bulked segregant analysis (MBSA) method used to locate a new stem rust resistance gene (Sr54) in the winter wheat cultivar Norin 40. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2013; 126:443-449. [PMID: 23052026 DOI: 10.1007/s00122-012-1992-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Accepted: 09/21/2012] [Indexed: 06/01/2023]
Abstract
An important aspect of studying putative new genes in wheat is determining their position on the wheat genetic map. The primary difficulty in mapping genes is determining which chromosome carries the gene of interest. Several approaches have been developed to address this problem, each with advantages and disadvantages. Here we describe a new approach called multiple bulked segregant analysis (MBSA). A set of 423 simple sequence repeat (SSR) markers were selected based on profile simplicity, frequency of polymorphism, and distribution across the wheat genome. SSR primers were preloaded in 384-well PCR plates with each primer occupying 16 wells. In practice, 14 wells are reserved for "mini-bulks" that are equivalent to four gametes (e.g. two F(2) individuals) comprised of individuals from a segregated population that have a known homozygous genotype for the gene of interest. The remaining two wells are reserved for the parents of the population. Each well containing a mini-bulk can have one of three allele compositions for each SSR: only the allele from one parent, only the allele from the other parent, or both alleles. Simulation experiments were performed to determine the pattern of mini-bulk allele composition that would indicate putative linkage between the SSR in question and the gene of interest. As a test case, MBSA was employed to locate an unidentified stem rust resistance (Sr) gene in the winter wheat cultivar Norin 40. A doubled haploid (DH) population (n = 267) was produced from hybrids of the cross LMPG-6S/Norin 40. The DH population segregated for a single gene (χ (1:1) (2) = 0.093, p = 0.76) for resistance to Puccinia graminis f.sp. tritici race LCBN. Four resistant DH lines were included in each of the 14 mini-bulks for screening. The Sr gene was successfully located to the long arm of chromosome 2D using MBSA. Further mapping confirmed the chromosome location and revealed that the Sr gene was located in a linkage block that may represent an alien translocation. The new Sr gene was designated as Sr54.
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Affiliation(s)
- Habibollah Ghazvini
- Cereal Research Department, Seed and Plant Improvement Institute, AREEO, Ministry of Jahad Agriculture, Karaj, Iran
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Ejaz M, Iqbal M, Shahzad A, Atiq‐ur‐Rehman, Ahmed I, Ali GM. Genetic Variation for Markers Linked to Stem Rust Resistance Genes in Pakistani Wheat Varieties. CROP SCIENCE 2012; 52:2638-2648. [DOI: 10.2135/cropsci2012.01.0040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Affiliation(s)
- Mahwish Ejaz
- Department of Plant Genomics and BiotechnologyPARC Institute of Advanced Studies in Agriculture, National Agricultural Research Centre (NARC)IslamabadPakistan
| | - Muhammad Iqbal
- Department of Plant Genomics and BiotechnologyPARC Institute of Advanced Studies in Agriculture, National Agricultural Research Centre (NARC)IslamabadPakistan
| | - Armghan Shahzad
- Department of Plant Genomics and BiotechnologyPARC Institute of Advanced Studies in Agriculture, National Agricultural Research Centre (NARC)IslamabadPakistan
| | | | - Iftikhar Ahmed
- Department of Plant Genomics and BiotechnologyPARC Institute of Advanced Studies in Agriculture, National Agricultural Research Centre (NARC)IslamabadPakistan
| | - Ghulam M. Ali
- Department of Plant Genomics and BiotechnologyPARC Institute of Advanced Studies in Agriculture, National Agricultural Research Centre (NARC)IslamabadPakistan
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Rouse MN, Nava IC, Chao S, Anderson JA, Jin Y. Identification of markers linked to the race Ug99 effective stem rust resistance gene Sr28 in wheat (Triticum aestivum L.). TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2012; 125:877-85. [PMID: 22584633 DOI: 10.1007/s00122-012-1879-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 04/19/2012] [Indexed: 05/20/2023]
Abstract
Wheat stem rust caused by Puccinia graminis f. sp. tritici can cause devastating yield losses in wheat. Over the past several decades, stem rust has been controlled worldwide through the use of genetic resistance. Stem rust race TTKSK (Ug99), first detected in Uganda in 1998, threatens global wheat production because of its unique virulence combination. As the majority of the currently grown cultivars and advanced breeding lines are susceptible to race TTKSK, sources of resistance need to be identified and characterized to facilitate their use in agriculture. South Dakota breeding line SD 1691 displayed resistance to race TTKSK in the international wheat stem rust nursery in Njoro, Kenya. Seedling screening of progeny derived from SD 1691 crossed to susceptible LMPG-6 indicated that a single resistance gene was present. Allelism and race-specificity tests indicated the stem rust resistance gene in SD 1691 was Sr28. The chromosome arm location of Sr28 was previously demonstrated to be 2BL. We identified molecular markers linked to Sr28 and validated this linkage in two additional populations. Common spring wheat cultivars in the central United States displayed allelic diversity for markers flanking Sr28. These markers could be used to select for Sr28 in breeding populations and for combining Sr28 with other stem rust resistance genes.
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Affiliation(s)
- Matthew N Rouse
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Cereal Disease Laboratory, 1551 Lindig Street, St. Paul, MN, USA.
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Ghazvini H, Hiebert CW, Zegeye T, Liu S, Dilawari M, Tsilo T, Anderson JA, Rouse MN, Jin Y, Fetch T. Inheritance of resistance to Ug99 stem rust in wheat cultivar Norin 40 and genetic mapping of Sr42. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2012; 125:817-24. [PMID: 22580967 DOI: 10.1007/s00122-012-1874-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Accepted: 04/19/2012] [Indexed: 05/20/2023]
Abstract
Stem rust, caused by Puccinia graminis f. sp. tritici, is a devastating disease of wheat. The emergence of race TTKSK (Ug99) and new variants in Africa threatens wheat production worldwide. The best method of controlling stem rust is to deploy effective resistance genes in wheat cultivars. Few stem rust resistance (Sr) genes derived from the primary gene pool of wheat confer resistance to TTKSK. Norin 40, which carries Sr42, is resistant to TTKSK and variants TTKST and TTTSK. The goal of this study was to elucidate the inheritance of resistance to Ug99 in Norin 40 and map the Sr gene(s). A doubled haploid (DH) population of LMPG-6/Norin 40 was evaluated for resistance to the race TTKST. Segregation of 248 DH lines fitted a 1:1 ratio (χ (2) 1:1= 0.58, p = 0.45), indicating a single gene in Norin 40 conditioned resistance to Ug99. This was confirmed by an independent F(2:3) population also derived from the cross LMPG-6/Norin 40 where a 1:2:1 ratio (χ (2)1:2:1 = 0.69, p = 0.71) was observed following the inoculation with race TTKSK. Mapping with DNA markers located this gene to chromosome 6DS, the known location of Sr42. PCR marker FSD_RSA co-segregated with Sr42, and simple sequence repeat (SSR) marker BARC183 was closely linked (0.5 cM) to Sr42. A previous study found close linkage between FSD_RSA and SrCad, a temporarily designated gene that also confers resistance to Ug99, thus Sr42 may be the same gene or allelic. Marker FSD_RSA is suitable for marker-assisted selection (MAS) in wheat breeding programs to improve stem rust resistance, including Ug99.
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Affiliation(s)
- Habibollah Ghazvini
- Cereal Research Centre, Agriculture & Agri-Food Canada, 195 Dafoe Road, Winnipeg, MB, R3T 2M9, Canada
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Mago R, Tabe L, McIntosh RA, Pretorius Z, Kota R, Paux E, Wicker T, Breen J, Lagudah ES, Ellis JG, Spielmeyer W. A multiple resistance locus on chromosome arm 3BS in wheat confers resistance to stem rust (Sr2), leaf rust (Lr27) and powdery mildew. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2011; 123:615-23. [PMID: 21573954 DOI: 10.1007/s00122-011-1611-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Accepted: 04/26/2011] [Indexed: 05/21/2023]
Abstract
Sr2 is the only known durable, race non-specific adult plant stem rust resistance gene in wheat. The Sr2 gene was shown to be tightly linked to the leaf rust resistance gene Lr27 and to powdery mildew resistance. An analysis of recombinants and mutants suggests that a single gene on chromosome arm 3BS may be responsible for resistance to these three fungal pathogens. The resistance functions of the Sr2 locus are compared and contrasted with those of the adult plant resistance gene Lr34.
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Affiliation(s)
- R Mago
- CSIRO Plant Industry, Canberra 2601, Australia
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Liu W, Rouse M, Friebe B, Jin Y, Gill B, Pumphrey MO. Discovery and molecular mapping of a new gene conferring resistance to stem rust, Sr53, derived from Aegilops geniculata and characterization of spontaneous translocation stocks with reduced alien chromatin. Chromosome Res 2011; 19:669-82. [DOI: 10.1007/s10577-011-9226-3] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Revised: 05/27/2011] [Accepted: 06/16/2011] [Indexed: 02/05/2023]
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Rouse MN, Wanyera R, Njau P, Jin Y. Sources of Resistance to Stem Rust Race Ug99 in Spring Wheat Germplasm. PLANT DISEASE 2011; 95:762-766. [PMID: 30731910 DOI: 10.1094/pdis-12-10-0940] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Wheat stem rust (Puccinia graminis f. sp. tritici) race TTKSK (Ug99), with virulence to the majority of the world's wheat (Triticum aestivum) cultivars, has spread from Uganda throughout eastern Africa, Yemen, and Iran. The identification and spread of variants of race TTKSK with virulence to additional stem rust resistance genes has reminded breeders and pathologists of the danger of deploying major resistance genes alone. In order to protect wheat from this rapidly spreading and adapting pathogen, multiple resistance genes are needed, preferably from improved germplasm. Preliminary screening of over 700 spring wheat breeding lines and cultivars developed at least 20 years ago identified 88 accessions with field resistance to Ug99. We included these resistant accessions in the stem rust screening nursery in Njoro, Kenya for two additional seasons. The accessions were also screened with a bulk of North American isolates of P. graminis f. sp. tritici in the field in St. Paul, MN. In order to further characterize the resistance in these accessions, we obtained seedling phenotypes for 10 races of P. graminis f. sp. tritici, including two races from the race TTKSK complex. This phenotyping led to the identification of accessions with either adult-plant or all-stage resistance to race TTKSK, and often North American races of P. graminis f. sp. tritici as well. These Ug99 resistant accessions can be obtained by breeders and introgressed into current breeding germplasm.
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Affiliation(s)
- M N Rouse
- United States Department of Agriculture-Agricultural Research Service Cereal Disease Laboratory, University of Minnesota, St. Paul 55108
| | - R Wanyera
- Kenya Agricultural Research Institute, National Plant Breeding Research Center, P.O. Njoro, Kenya
| | - P Njau
- Kenya Agricultural Research Institute, National Plant Breeding Research Center, P.O. Njoro, Kenya
| | - Y Jin
- USDA-ARS Cereal Disease Laboratory, University of Minnesota, St. Paul 55108
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