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Lunzer M, Dumalasová V, Pfatrisch K, Buerstmayr H, Grausgruber H. Common bunt in organic wheat: unravelling infection characteristics relevant for resistance breeding. FRONTIERS IN PLANT SCIENCE 2023; 14:1264458. [PMID: 37885659 PMCID: PMC10598596 DOI: 10.3389/fpls.2023.1264458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 09/26/2023] [Indexed: 10/28/2023]
Abstract
Common bunt caused by Tilletia tritici and T. laevis has re-emerged as a major threat to wheat yield and quality, especially in organic farming. Resistance against its causal agents is present in the wheat gene pool and provides the most economically efficient and sustainable way to combat the disease since seed treatments approved for organic farming are rare and do not always provide full protection. We tested a winter wheat diversity panel with 128 lines for common bunt resistance in Austria and Czechia, and evaluated the applicability of marker-assisted selection (MAS) via Kompetitive Allele-Specific PCR markers in genotypes with high variation in their genetic background. Field trials were conducted across two years and artificially inoculated with local bunt populations. The virulence patterns of these inocula differed between locations and only 15% of the tested genotypes showed stable resistance across test sites. Number and weight of bunt sori relative to the total number and weight of wheat grains in sampled ears revealed that partial infections of ears were frequently appearing. Forty-two breeding lines harboring combinations of four different resistance QTL were developed through MAS. Out of these, a quarter were resistant with a maximum of 5% common bunt incidence. On the other hand, only six out of 46 tested commercial cultivars and breeding lines showed no infection with common bunt, underlining the present scarcity of bunt-resistant cultivars for organic wheat production. By this study we showed that MAS is a useful tool to speed up the selection of resistant lines even in populations with highly diverse genetic backgrounds, and that it is efficient in pyramiding resistance loci and thereby improving the level of resistance.
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Affiliation(s)
- Magdalena Lunzer
- Department of Agrobiotechnology, IFA-Tulln, University of Natural Resources and Life Sciences, Vienna, Tulln an der Donau, Austria
| | - Veronika Dumalasová
- Department of Genetics and Plant Breeding, Crop Research Institute, Prague, Czechia
| | - Kilian Pfatrisch
- Department of Crop Sciences, University of Natural Resources and Life Sciences Vienna, Tulln an der Donau, Austria
| | - Hermann Buerstmayr
- Department of Agrobiotechnology, IFA-Tulln, University of Natural Resources and Life Sciences, Vienna, Tulln an der Donau, Austria
| | - Heinrich Grausgruber
- Department of Crop Sciences, University of Natural Resources and Life Sciences Vienna, Tulln an der Donau, Austria
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Lunzer M, Buerstmayr M, Grausgruber H, Müllner AE, Fallbacher I, Buerstmayr H. Wheat (Triticum aestivum) chromosome 6D harbours the broad spectrum common bunt resistance gene Bt11. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2023; 136:207. [PMID: 37679535 PMCID: PMC10485103 DOI: 10.1007/s00122-023-04452-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 08/23/2023] [Indexed: 09/09/2023]
Abstract
KEY MESSAGE A major QTL on chromosome 6DL corresponding to bunt resistance gene Bt11 was identified in four mapping populations generated through crosses with Bt11-carriers PI 166910 and M822123. Common bunt in wheat has witnessed a renaissance with the rise of organic agriculture that began in the 1980s. The abandonment of systemic fungicides in organic farming, together with a lack of resistant cultivars, has led to wide-spread problems due to common bunt infections. Knowledge about genetic sources for resistance is still scarce and only few of the known bunt resistance factors are currently used in breeding. We therefore aimed to map the resistance factor harboured by the Turkish landrace PI 166910, which is the resistance donor for the Bt11 bunt differential line. Four mapping populations (MPs) with 96-132 recombinant inbred lines (RILs) were phenotyped for common bunt resistance over 2, 3 or 4 years with one or two local bunt populations and genotyped with the 25K SNP array. A major bunt resistance locus on the distal end of chromosome 6D designated QBt.ifa-6DL was identified in all MPs and experiments. Additional QTL contributing to resistance were detected on chromosomes 4B, 1A, 1B, 2A and 7B. QBt.ifa-6DL mapped to a region overlapping with the Bt9-locus identified in previous studies, but results indicate that QBt.ifa-6DL is different from Bt9 and convincing evidence from haplotype comparisons suggests that it represents the Bt11 resistance allele. Markers for the distal region of chromosome 6D between 492.6 and 495.2 Mbp can be used to select for QBt.ifa-6DL. This resistance factor confers high and stable resistance against common bunt and should be integrated into organic and low-input wheat breeding programs.
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Affiliation(s)
- Magdalena Lunzer
- Institute of Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 20, Tulln, Vienna, 3430, Austria.
| | - Maria Buerstmayr
- Institute of Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 20, Tulln, Vienna, 3430, Austria
| | - Heinrich Grausgruber
- Institute of Plant Breeding, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 24, Tulln, Vienna, 3430, Austria
| | - Almuth Elise Müllner
- Institute of Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 20, Tulln, Vienna, 3430, Austria
- Saatzucht Donau GesmbH & CoKG, Saatzuchtstrasse 11, Probstdorf, 2301, Austria
| | - Iris Fallbacher
- Institute of Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 20, Tulln, Vienna, 3430, Austria
- Österreichische Rübensamenzucht Ges.m.b.H, Josef-Reither-Straße 21-23, Tulln, 3430, Austria
| | - Hermann Buerstmayr
- Institute of Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 20, Tulln, Vienna, 3430, Austria
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Jabran M, Ali MA, Zahoor A, Muhae-Ud-Din G, Liu T, Chen W, Gao L. Intelligent reprogramming of wheat for enhancement of fungal and nematode disease resistance using advanced molecular techniques. FRONTIERS IN PLANT SCIENCE 2023; 14:1132699. [PMID: 37235011 PMCID: PMC10206142 DOI: 10.3389/fpls.2023.1132699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 04/19/2023] [Indexed: 05/28/2023]
Abstract
Wheat (Triticum aestivum L.) diseases are major factors responsible for substantial yield losses worldwide, which affect global food security. For a long time, plant breeders have been struggling to improve wheat resistance against major diseases by selection and conventional breeding techniques. Therefore, this review was conducted to shed light on various gaps in the available literature and to reveal the most promising criteria for disease resistance in wheat. However, novel techniques for molecular breeding in the past few decades have been very fruitful for developing broad-spectrum disease resistance and other important traits in wheat. Many types of molecular markers such as SCAR, RAPD, SSR, SSLP, RFLP, SNP, and DArT, etc., have been reported for resistance against wheat pathogens. This article summarizes various insightful molecular markers involved in wheat improvement for resistance to major diseases through diverse breeding programs. Moreover, this review highlights the applications of marker assisted selection (MAS), quantitative trait loci (QTL), genome wide association studies (GWAS) and the CRISPR/Cas-9 system for developing disease resistance against most important wheat diseases. We also reviewed all reported mapped QTLs for bunts, rusts, smuts, and nematode diseases of wheat. Furthermore, we have also proposed how the CRISPR/Cas-9 system and GWAS can assist breeders in the future for the genetic improvement of wheat. If these molecular approaches are used successfully in the future, they can be a significant step toward expanding food production in wheat crops.
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Affiliation(s)
- Muhammad Jabran
- State Key Laboratory for Biology of Plant Diseases, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Muhammad Amjad Ali
- Department of Plant Pathology, University of Agriculture, Faisalabad, Pakistan
| | - Adil Zahoor
- Department of Biotechnology, Chonnam National University, Yeosu, Republic of Korea
| | - Ghulam Muhae-Ud-Din
- State Key Laboratory for Biology of Plant Diseases, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Taiguo Liu
- State Key Laboratory for Biology of Plant Diseases, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Wanquan Chen
- State Key Laboratory for Biology of Plant Diseases, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Li Gao
- State Key Laboratory for Biology of Plant Diseases, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
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Mourad AMI, Morgounov A, Baenziger PS, Esmail SM. Genetic Variation in Common Bunt Resistance in Synthetic Hexaploid Wheat. PLANTS (BASEL, SWITZERLAND) 2022; 12:2. [PMID: 36616131 PMCID: PMC9824752 DOI: 10.3390/plants12010002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 11/16/2022] [Accepted: 11/21/2022] [Indexed: 06/17/2023]
Abstract
Common bunt (caused by Tilletia caries and T. Foetida) is a major wheat disease. It occurs frequently in the USA and Turkey and damages grain yield and quality. Seed treatment with fungicides is an effective method to control this disease. However, using fungicides in organic and low-income fields is forbidden, and planting resistant cultivars are preferred. Due to the highly effective use of fungicides, little effort has been put into breeding resistant genotypes. In addition, the genetic diversity for this trait is low in modern wheat germplasm. Synthetic wheat genotypes were reported as an effective source to increase the diversity in wheat germplasm. Therefore, a set of 25 synthetics that are resistant to the Turkish common bunt race were evaluated against the Nebraska common bunt race. Four genotypes were found to be very resistant to Nebraska's common bunt race. Using differential lines, four isolines carrying genes, Bt10, Bt11, Bt12, and Btp, were found to provide resistance against both Turkish and Nebraska common bunt races. Genotypes carrying any or all of these four genes could be used as a source of resistance in both countries. No correlation was found between common bunt resistance and some agronomic traits, which suggests that common bunt resistance is an independent trait.
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Affiliation(s)
- Amira M. I. Mourad
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), 06466 Gatersleben, Germany
- Agronomy Department, Faculty of Agriculture, Assiut University, Asyut 71526, Egypt
| | - Alexey Morgounov
- International Maize and Wheat Improvement Center (CIMMYT), P.K. 39 Emek, 06511 Ankara, Turkey
| | - P. Stephen Baenziger
- Department of Agronomy and Horticulture, Plant Science Hall, University of Nebraska–Lincoln, Lincoln, NE 68583, USA
| | - Samar M. Esmail
- Wheat Disease Research Department, Plant Pathology Research Institute, Agricultural Research Center, Giza 12619, Egypt
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Iqbal M, Semagn K, Jarquin D, Randhawa H, McCallum BD, Howard R, Aboukhaddour R, Ciechanowska I, Strenzke K, Crossa J, Céron-Rojas JJ, N’Diaye A, Pozniak C, Spaner D. Identification of Disease Resistance Parents and Genome-Wide Association Mapping of Resistance in Spring Wheat. PLANTS (BASEL, SWITZERLAND) 2022; 11:2905. [PMID: 36365358 PMCID: PMC9658635 DOI: 10.3390/plants11212905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 10/03/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
The likelihood of success in developing modern cultivars depend on multiple factors, including the identification of suitable parents to initiate new crosses, and characterizations of genomic regions associated with target traits. The objectives of the present study were to (a) determine the best economic weights of four major wheat diseases (leaf spot, common bunt, leaf rust, and stripe rust) and grain yield for multi-trait restrictive linear phenotypic selection index (RLPSI), (b) select the top 10% cultivars and lines (hereafter referred as genotypes) with better resistance to combinations of the four diseases and acceptable grain yield as potential parents, and (c) map genomic regions associated with resistance to each disease using genome-wide association study (GWAS). A diversity panel of 196 spring wheat genotypes was evaluated for their reaction to stripe rust at eight environments, leaf rust at four environments, leaf spot at three environments, common bunt at two environments, and grain yield at five environments. The panel was genotyped with the Wheat 90K SNP array and a few KASP SNPs of which we used 23,342 markers for statistical analyses. The RLPSI analysis performed by restricting the expected genetic gain for yield displayed significant (p < 0.05) differences among the 3125 economic weights. Using the best four economic weights, a subset of 22 of the 196 genotypes were selected as potential parents with resistance to the four diseases and acceptable grain yield. GWAS identified 37 genomic regions, which included 12 for common bunt, 13 for leaf rust, 5 for stripe rust, and 7 for leaf spot. Each genomic region explained from 6.6 to 16.9% and together accounted for 39.4% of the stripe rust, 49.1% of the leaf spot, 94.0% of the leaf rust, and 97.9% of the common bunt phenotypic variance combined across all environments. Results from this study provide valuable information for wheat breeders selecting parental combinations for new crosses to develop improved germplasm with enhanced resistance to the four diseases as well as the physical positions of genomic regions that confer resistance, which facilitates direct comparisons for independent mapping studies in the future.
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Affiliation(s)
- Muhammad Iqbal
- Department of Agricultural, Food and Nutritional Science, University of Alberta, 4–10 Agriculture-Forestry Centre, Edmonton, AB T6G 2P5, Canada
| | - Kassa Semagn
- Department of Agricultural, Food and Nutritional Science, University of Alberta, 4–10 Agriculture-Forestry Centre, Edmonton, AB T6G 2P5, Canada
| | - Diego Jarquin
- Agronomy Department, University of Florida, Gainesville, FL 32611, USA
| | - Harpinder Randhawa
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, 5403 1st Avenue South, Lethbridge, AB T1J 4B1, Canada
| | - Brent D. McCallum
- Morden Research and Development Centre, Agriculture and Agri-Food Canada, 101 Route 100, Morden, MB R6M 1Y5, Canada
| | - Reka Howard
- Department of Statistics, University of Nebraska—Lincoln, Lincoln, NE 68583, USA
| | - Reem Aboukhaddour
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, 5403 1st Avenue South, Lethbridge, AB T1J 4B1, Canada
| | - Izabela Ciechanowska
- Department of Agricultural, Food and Nutritional Science, University of Alberta, 4–10 Agriculture-Forestry Centre, Edmonton, AB T6G 2P5, Canada
| | - Klaus Strenzke
- Department of Agricultural, Food and Nutritional Science, University of Alberta, 4–10 Agriculture-Forestry Centre, Edmonton, AB T6G 2P5, Canada
| | - José Crossa
- Biometrics and Statistics Unit, International Maize and Wheat Improvement Center (CIMMYT), Km 45 Carretera, Veracruz 52640, Mexico
| | - J. Jesus Céron-Rojas
- Biometrics and Statistics Unit, International Maize and Wheat Improvement Center (CIMMYT), Km 45 Carretera, Veracruz 52640, Mexico
| | - Amidou N’Diaye
- Crop Development Centre and Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK S7N 5A8, 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, University of Alberta, 4–10 Agriculture-Forestry Centre, Edmonton, AB T6G 2P5, Canada
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Ehn M, Michel S, Morales L, Gordon T, Dallinger HG, Buerstmayr H. Genome-wide association mapping identifies common bunt (Tilletia caries) resistance loci in bread wheat (Triticum aestivum) accessions of the USDA National Small Grains Collection. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2022; 135:3103-3115. [PMID: 35896689 PMCID: PMC9668943 DOI: 10.1007/s00122-022-04171-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 07/05/2022] [Indexed: 06/15/2023]
Abstract
Association mapping and phenotypic analysis of a diversity panel of 238 bread wheat accessions highlights differences in resistance against common vs. dwarf bunt and identifies genotypes valuable for bi-parental crosses. Common bunt caused by Tilletia caries and T. laevis was successfully controlled by seed dressings with systemic fungicides for decades, but has become a renewed threat to wheat yield and quality in organic agriculture where such treatments are forbidden. As the most efficient way to address this problem is the use of resistant cultivars, this study aims to broaden the spectrum of resistance sources available for breeders by identifying resistance loci against common bunt in bread wheat accessions of the USDA National Small Grains Collection. We conducted three years of artificially inoculated field trials to assess common bunt infection levels in a diversity panel comprising 238 wheat accessions for which data on resistance against the closely related pathogen Tilletia controversa causing dwarf bunt was already available. Resistance levels against common bunt were higher compared to dwarf bunt with 99 accessions showing [Formula: see text] 1% incidence. Genome-wide association mapping identified six markers significantly associated with common bunt incidence in regions already known to confer resistance on chromosomes 1A and 1B and novel loci on 2B and 7A. Our results show that resistance against common and dwarf bunt is not necessarily controlled by the same loci but we identified twenty accessions with high resistance against both diseases. These represent valuable new resources for research and breeding programs since several bunt races have already been reported to overcome known resistance genes.
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Affiliation(s)
- Magdalena Ehn
- Institute of Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 20, 3430, Tulln, Austria.
| | - Sebastian Michel
- Institute of Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 20, 3430, Tulln, Austria
| | - Laura Morales
- Institute of Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 20, 3430, Tulln, Austria
| | - Tyler Gordon
- Small Grains and Potato Germplasm Research Unit, USDA-ARS, 1691 S. 2700 W., Aberdeen, ID, 83210, USA
| | - Hermann Gregor Dallinger
- Institute of Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 20, 3430, Tulln, Austria
| | - Hermann Buerstmayr
- Institute of Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 20, 3430, Tulln, Austria
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Madenova A, Sapakhova Z, Bakirov S, Galymbek K, Yernazarova G, Kokhmetova A, Keishilov Z. Screening of wheat genotypes for the presence of common bunt resistance genes. Saudi J Biol Sci 2021; 28:2816-2823. [PMID: 34012323 PMCID: PMC8116974 DOI: 10.1016/j.sjbs.2021.02.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/26/2021] [Accepted: 02/01/2021] [Indexed: 10/25/2022] Open
Abstract
Common bunt is known to cause grain yield and quality losses in wheat due to bunt ball formation and infestation of the grain. The aim of this study is to identify for sources of resistance to common bunt in wheat genotypes using phytopathological and molecular methods. In general, studied 60 Kazakh and foreign wheat genotypes were found 15 samples with the Bt9, Bt8 and Bt11 genes. Carriers of the Bt10 gene include the five varieties. The four resistance genes, Bt8, Bt10, Bt11, Bt9, and Bt10 were identified in the Karasai variety. Phytopathological and molecular screening of Kazakh and foreign wheat genotypes selected 18 with genes for resistance to the disease. According to evaluation on an artificial infection 19 varieties showed an immune type of reaction. These varieties will be used in breeding programs as donors to create resistant varieties against the common bunt. Thus, approaches can reduce the level of fungicides use and the most effective method to control the common bunt.
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Affiliation(s)
- Aigul Madenova
- Al-Farabi Kazakh National University, 050040, Al-Farabi Avenue 71, Almaty, Kazakhstan.,Institute of Plant Biology and Biotechnology, 050040, Timiryazev Street 45, Almaty, Kazakhstan.,Abai Kazakh National Pedagogical University, 050010, Dostyk Avenue 13, Almaty, Kazakhstan
| | - Zagipa Sapakhova
- Kazakh National Agrarian Research University, 050010, Abai Avenue 8, Almaty, Kazakhstan
| | - Serik Bakirov
- Abai Kazakh National Pedagogical University, 050010, Dostyk Avenue 13, Almaty, Kazakhstan
| | - Kanat Galymbek
- Institute of Plant Biology and Biotechnology, 050040, Timiryazev Street 45, Almaty, Kazakhstan.,Abai Kazakh National Pedagogical University, 050010, Dostyk Avenue 13, Almaty, Kazakhstan
| | - Gulzira Yernazarova
- Al-Farabi Kazakh National University, 050040, Al-Farabi Avenue 71, Almaty, Kazakhstan
| | - Alma Kokhmetova
- Institute of Plant Biology and Biotechnology, 050040, Timiryazev Street 45, Almaty, Kazakhstan
| | - Zhenis Keishilov
- Institute of Plant Biology and Biotechnology, 050040, Timiryazev Street 45, Almaty, Kazakhstan
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Muellner AE, Buerstmayr M, Eshonkulov B, Hole D, Michel S, Hagenguth JF, Pachler B, Pernold R, Buerstmayr H. Comparative mapping and validation of multiple disease resistance QTL for simultaneously controlling common and dwarf bunt in bread wheat. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2021; 134:489-503. [PMID: 33120433 PMCID: PMC7843488 DOI: 10.1007/s00122-020-03708-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 10/13/2020] [Indexed: 05/20/2023]
Abstract
KEY MESSAGE Resistance QTL on chromosomes 1AL and 7AL are effective against common and dwarf bunt, QTL on 1BS affects common bunt and QTL on 7DS affects dwarf bunt in bread wheat. Common bunt, caused by Tilletia caries and T. laevis, and dwarf bunt, caused by T. controversa, negatively affect grain yield and quality of wheat and are particularly destructive in low-input and organic production systems. Two recombinant inbred line (RIL) populations derived by crossing the highly and durably resistant cultivars 'Blizzard' and 'Bonneville' to the susceptible cultivar 'Rainer' were evaluated for their resistance to common and dwarf bunt in artificially inoculated field and greenhouse trials over two growing seasons and genotyped with a 15 K SNP array. Bunt resistance QTL were mapped to chromosomes 1AL, 1BS, 7AL and 7DS. Common bunt resistance was regulated by the major QTL QBt.ifa-1BS and QBt.ifa-1AL together with the moderate effect QTL QBt.ifa-7AL. Dwarf bunt resistance was on the other hand regulated by the QTL QBt.ifa-1AL, QBt.ifa-7AL and QBt.ifa-7DS. Common bunt resistance QTL exhibited pronounced epistatic effects, while epistatic effects were of smaller magnitude for dwarf bunt QTL. Kompetitive Allele-Specific PCR (KASP) markers were developed from SNPs associated with bunt resistance QTL and successfully used for QTL validation in an independent set of RILs. These KASP markers have the potential to support targeted introgression of QTL into elite wheat germplasm and accelerate breeding for enhanced bunt resistance. Durable protection against both common and dwarf bunt can be achieved by combining multiple resistance genes in the same genetic background.
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Affiliation(s)
- Almuth E Muellner
- Institute for Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad Lorenz Straße 20, 3430, Vienna, Tulln, Austria
- Saatzucht Donau GesmbH. & CoKG, Saatzuchtstrasse 11, 2301, Probstdorf, Austria
| | - Maria Buerstmayr
- Institute for Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad Lorenz Straße 20, 3430, Vienna, Tulln, Austria.
| | - Bobur Eshonkulov
- Institute for Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad Lorenz Straße 20, 3430, Vienna, Tulln, Austria
- Samarkand Branch of Tashkent State University of Economics, Professors Street 51, 140147, Samarkand, Usbekistan
| | - David Hole
- Utah State University, 2325 Old Main Hill, Logan, UT, 84322, USA
| | - Sebastian Michel
- Institute for Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad Lorenz Straße 20, 3430, Vienna, Tulln, Austria
| | - Julia F Hagenguth
- Institute for Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad Lorenz Straße 20, 3430, Vienna, Tulln, Austria
- Division of Plant Breeding Methodology, University of Goettingen, Carl-Sprengel-Weg 1, 37075, Göttingen, Germany
| | - Bernadette Pachler
- Institute for Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad Lorenz Straße 20, 3430, Vienna, Tulln, Austria
- Saatbau Linz eGen, Breeding Station Schoenering, Angerweg 19, 4073, Wilhering, Austria
| | - Ricarda Pernold
- Institute for Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad Lorenz Straße 20, 3430, Vienna, Tulln, Austria
- , Mauerbachstraße 5, 1140, Wien, Austria
| | - Hermann Buerstmayr
- Institute for Biotechnology in Plant Production, University of Natural Resources and Life Sciences, Konrad Lorenz Straße 20, 3430, Vienna, Tulln, Austria
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Gordon T, Wang R, Hole D, Bockelman H, Michael Bonman J, Chen J. Genetic characterization and genome-wide association mapping for dwarf bunt resistance in bread wheat accessions from the USDA National Small Grains Collection. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2020; 133:1069-1080. [PMID: 31938812 PMCID: PMC7021738 DOI: 10.1007/s00122-020-03532-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 01/03/2020] [Indexed: 05/03/2023]
Abstract
Dwarf bunt-resistant bread wheat accessions and SNP markers associated with DB resistance identified in this study are valuable resources for characterization and deployment of DB resistance in bread wheat. Dwarf bunt (DB), caused by Tilletia controversa J.G. Kühn, can significantly reduce grain yield and quality on autumn-sown wheat in regions with prolonged snow cover. DB can be managed with the use of resistant cultivars. The objectives of the present study were to characterize DB resistance in a large set of bread wheat accessions from the National Small Grains Collection and use a genome-wide association study approach to identify genetic loci associated with DB resistance. A total of 292 accessions were selected using historical DB resistance data recorded across many trials and years in the Germplasm Resources Information Network (GRIN) and re-tested for DB resistance in replicated field nurseries in Logan, UT, in 2017, 2018, and 2019. Ninety-eight accessions were resistant with DB normalized incidence ≤ 10%, and twenty-eight of these were highly resistant with DB normalized incidence ≤ 1% in both GRIN and the field nurseries. Based on the presence of marker haplotypes of the four published dwarf bunt QTL on 6DS, 6DL, 7AL, and 7DS, highly resistant accessions identified in this study may provide novel resistance and should be further evaluated. This study validated one previously identified QTL on 6DS and identified an additional locus on 6DS. These loci explained 9-15% of the observed phenotypic variation. The resistant accessions and molecular markers identified in the present study may provide valuable resources for characterization and deployment of DB resistance in bread wheat.
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Affiliation(s)
- Tyler Gordon
- USDA-ARS-Small Grains and Potato Germplasm Research Unit, 1691 S. 2700 W., Aberdeen, ID, 83210, USA
- University of Idaho-Aberdeen Research and Extension Center, 1693 S. 2700 W., Aberdeen, ID, 83210, USA
| | - Rui Wang
- University of Idaho-Aberdeen Research and Extension Center, 1693 S. 2700 W., Aberdeen, ID, 83210, USA
| | - David Hole
- Department of Plants, Soils and Climate, Utah State University, 2325 Old Main Hill, Logan, UT, 84322, USA
| | - Harold Bockelman
- USDA-ARS-Small Grains and Potato Germplasm Research Unit, 1691 S. 2700 W., Aberdeen, ID, 83210, USA
| | - J Michael Bonman
- USDA-ARS-Small Grains and Potato Germplasm Research Unit, 1691 S. 2700 W., Aberdeen, ID, 83210, USA
| | - Jianli Chen
- University of Idaho-Aberdeen Research and Extension Center, 1693 S. 2700 W., Aberdeen, ID, 83210, USA.
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Laroche A, Frick M, Graf RJ, Larsen J, Laurie JD. Pyramiding disease resistance genes in elite winter wheat germplasm for Western Canada. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.cj.2019.08.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Bokore FE, Cuthbert RD, Knox RE, Singh A, Campbell HL, Pozniak CJ, N'Diaye A, Sharpe AG, Ruan Y. Mapping quantitative trait loci associated with common bunt resistance in a spring wheat (Triticum aestivum L.) variety Lillian. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2019; 132:3023-3033. [PMID: 31410494 PMCID: PMC6791905 DOI: 10.1007/s00122-019-03403-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 07/18/2019] [Indexed: 05/20/2023]
Abstract
Based on their consistency over environments, two QTL identified in Lillian on chromosomes 5A and 7A could be useful targets for marker assisted breeding of common bunt resistance. Common bunt of wheat (Triticum aestivum L.) caused by Tilletia tritici and T. laevis is an economically important disease because of losses in grain yield and reduced grain quality. Resistance can be quantitative, under the control of multiple small effect genes. The Canada Western Red Spring wheat variety Lillian is moderately resistant to common bunt races found on the Canadian prairies. This study was conducted to identify and map quantitative trait loci (QTL) conferring resistance against common bunt in Lillian. A doubled haploid population comprising 280 lines was developed from F1 plants of the cross of Lillian by Vesper. The lines were inoculated at seeding with the two races L16 (T. laevis) and T19 (T. tritici), grown in field near Swift Current, SK, in 2014, 2015 and 2016 and assessed for disease incidence. The lines were genotyped with the 90 K iSelect SNP genotyping assay, and a high-density genetic map was constructed. Quantitative trait locus analysis was performed with MapQTL.6® software. Two relatively stable common bunt resistance QTL, detected in two of the 3 years, were identified on chromosomes 5A and 7A from Lillian. In addition, three less stable QTL, appearing in one out of 3 years, were identified: one was contributed by Lillian on chromosome 3D and two were contributed by Vesper on chromosomes 1D and 2A. Epistatic interaction was identified for the bunt incidence between 3D and 7A resulting in greater bunt resistance. Future bunt resistance breeding will benefit from combining these QTL through gene pyramiding.
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Affiliation(s)
- Firdissa E Bokore
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada
| | - Richard D Cuthbert
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada.
| | - Ron E Knox
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada.
| | - Arti Singh
- Department of Agronomy, Iowa State University, Ames, IA, USA
| | - Heather L Campbell
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada
| | - Curtis J Pozniak
- Department of Plant Sciences, University of Saskatchewan, Saskatoon, SK, S7N 5A8, Canada
| | - Amidou N'Diaye
- Department of Plant Sciences, University of Saskatchewan, Saskatoon, SK, S7N 5A8, Canada
| | - Andrew G Sharpe
- National Research Council of Canada, 110 Gymnasium Place, Saskatoon, SK, S7N 0W9, Canada
| | - Yuefeng Ruan
- Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, SK, S9H 3X2, Canada
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12
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Wang R, Gordon T, Hole D, Zhao W, Isham K, Bonman JM, Goates B, Chen J. Identification and assessment of two major QTLs for dwarf bunt resistance in winter wheat line 'IDO835'. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2019; 132:2755-2766. [PMID: 31240345 DOI: 10.1007/s00122-019-03385-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 06/19/2019] [Indexed: 05/03/2023]
Abstract
Two major dwarf bunt resistance QTLs were mapped to a known Bt9 locus and a novel locus. The associated KASP markers were developed and validated in other two populations. Dwarf bunt (DB), caused by Tilletia controversa J.G. Kühn, and common bunt (CB), caused by T. caries and T. foetida, are two destructive diseases that reduce grain yield and quality in wheat. Breeding for bunt-resistant cultivars is important in many wheat production areas, especially where organic wheat is grown. However, few molecular markers have been used in selection of bunt resistance. In the present study, a doubled haploid (DH) population derived from the bunt-resistant line 'IDO835' and the susceptible cultivar 'Moreland' was evaluated for DB resistance in a field nursery in Logan, Utah, for four growing seasons. The population was genotyped with the Illumina 90 K SNP iSelect marker platform. Two major QTLs were consistently identified on chromosomes 6DL (Q.DB.ui-6DL) and 7AL (Q.DB.ui-7AL), explaining up to 53% and 38% of the phenotypic variation, respectively. Comparative study suggested that Q.DB.ui-6DL was located in the same region as the CB resistance gene Bt9, and Q.DB.ui-7AL was located at a novel locus for bunt resistance. Based on Chinese Spring reference sequence and annotations (IWGSC RefSeq v1.1), both resistance QTLs were mapped to disease resistance gene-rich (NBS-LRR and kinase genes) regions. To validate the identified QTL and design user-friendly markers for MAS, five SNPs were converted to Kompetitive Allele-Specific PCR (KASP) markers and used to genotype two validation panels, including a DH population and a diverse winter wheat population from USDA-ARS National Small Grain Collection, as well as a Bt gene investigation panel, consisting of 15 bunt differential lines and 11 resistant lines.
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Affiliation(s)
- Rui Wang
- Department of Plant Sciences, University of Idaho, Aberdeen, ID, USA
| | - Tyler Gordon
- Small Grains and Potato Germplasm Research Unit, USDA-ARS, Aberdeen, ID, USA
| | - David Hole
- Department of Plant Sciences, Utah State University, Logan, UT, USA
| | - Weidong Zhao
- Department of Plant Sciences, University of Idaho, Aberdeen, ID, USA
| | - Kyle Isham
- Department of Plant Sciences, University of Idaho, Aberdeen, ID, USA
| | - J Michael Bonman
- Small Grains and Potato Germplasm Research Unit, USDA-ARS, Aberdeen, ID, USA
| | - Blair Goates
- Small Grains and Potato Germplasm Research Unit, USDA-ARS, Aberdeen, ID, USA
| | - Jianli Chen
- Department of Plant Sciences, University of Idaho, Aberdeen, ID, USA.
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13
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Mourad AMI, Sallam A, Belamkar V, Mahdy E, Bakheit B, Abo El-Wafaa A, Stephen Baenziger P. Genetic architecture of common bunt resistance in winter wheat using genome-wide association study. BMC PLANT BIOLOGY 2018; 18:280. [PMID: 30424724 PMCID: PMC6234641 DOI: 10.1186/s12870-018-1435-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Accepted: 09/23/2018] [Indexed: 05/20/2023]
Abstract
BACKGROUND Common bunt (caused by Tilletia caries and T. foetida) has been considered as a major disease in wheat (Triticum aestivum) following rust (Puccinia spp.) in the Near East and is economically important in the Great Plains, USA. Despite the fact that it can be easily controlled using seed treatment with fungicides, fungicides often cannot or may not be used in organic and low-input fields. Planting common bunt resistant genotypes is an alternative. RESULTS To identify resistance genes for Nebraska common bunt race, the global set of differential lines were inoculated. Nine differential lines carrying nine different genes had 0% infected heads and seemed to be resistant to Nebraska race. To understand the genetic basis of the resistance in Nebraska winter wheat, a set of 330 genotypes were inoculated and evaluated under field conditions in two locations. Out of the 330 genotypes, 62 genotypes had different degrees of resistance. Moreover, plant height, chlorophyll content and days to heading were scored in both locations. Using genome-wide association study, 123 SNPs located on fourteen chromosomes were identified to be associated with the resistance. Different degrees of linkage disequilibrium was found among the significant SNPs and they explained 1.00 to 9.00% of the phenotypic variance, indicating the presence of many minor QTLs controlling the resistance. CONCLUSION Based on the chromosomal location of some of the known genes, some SNPs may be associated with Bt1, Bt6, Bt11 and Bt12 resistance loci. The remaining significant SNPs may be novel alleles that were not reported previously. Common bunt resistance seems to be an independent trait as no correlation was found between a number of infected heads and chlorophyll content, days to heading or plant height.
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Affiliation(s)
- Amira M. I. Mourad
- Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE USA
- Department of Agronomy, Faculty of Agriculture, Assiut University, Asyut, Egypt
| | - Ahmed Sallam
- Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE USA
- Department of Genetics, Faculty of Agriculture, Assiut University, Asyut, Egypt
| | - Vikas Belamkar
- Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE USA
| | - Ezzat Mahdy
- Department of Agronomy, Faculty of Agriculture, Assiut University, Asyut, Egypt
| | - Bahy Bakheit
- Department of Agronomy, Faculty of Agriculture, Assiut University, Asyut, Egypt
| | - Atif Abo El-Wafaa
- Department of Agronomy, Faculty of Agriculture, Assiut University, Asyut, Egypt
| | - P. Stephen Baenziger
- Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE USA
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