Pre-emptive breeding against karnal bunt infection in common wheat: combining genomic and agronomic information to identify suitable parents
Wheat (Triticum aestivum L.) is the most widely grown cereal crop in the world and is staple food to half the world’s population. The current world population is expected to reach 9.8 billion people by 2050, but food production is not expected to keep pace with demand in developing countries. Significant opportunities exist for traditional grain exporters to produce and export greater amounts of wheat to fill the gap. Karnal bunt, however, is a major threat, due to its use as a non-tariff trade barrier by several wheat-importing countries. The cultivation of resistant varieties remains the most cost-effective approach to manage the disease, but in countries that are free of the disease, genetic improvement is difficult due to quarantine restrictions. Here we report a study on pre-emptive breeding designed to identify linked molecular markers, evaluate the prospects of genomic selection as a tool, and prioritise wheat genotypes suitable for use as parents. In a genome-wide association (GWAS) study, we identified six DArTseq markers significantly linked to Karnal bunt resistance, which explained between 7.6 and 29.5% of the observed phenotypic variation. The accuracy of genomic prediction was estimated to vary between 0.53 and 0.56, depending on whether it is based solely on the identified Quantitative trait loci (QTL) markers or the use of genome-wide markers. As genotypes used as parents would be required to possess good yield and phenology, further research was conducted to assess the agronomic value of Karnal bunt resistant germplasm from the International Maize and Wheat Improvement Center (CIMMYT). We identified an ideal genotype, ZVS13_385, which possessed similar agronomic attributes to the highly successful Australian wheat variety, Mace. It is phenotypically resistant to Karnal bunt infection (<1% infection) and carried all the favourable alleles detected for resistance in this study. The identification of a genotype combining Karnal bunt resistance with adaptive agronomic traits overcomes the concerns of breeders regarding yield penalty in the absence of the disease.
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Format: | Article biblioteca |
Language: | English |
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Frontiers
2021
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Subjects: | AGRICULTURAL SCIENCES AND BIOTECHNOLOGY, Karnal Bunt Resistance, Genome-Wide Association Study, GWAS, Genomic Prediction, Grain Yield, KARNAL BUNT, DISEASE RESISTANCE, TILLETIA INDICA, WHEAT, TRITICUM AESTIVUM, GENOMICS, GRAIN, |
Online Access: | https://hdl.handle.net/10883/21599 |
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dig-cimmyt-10883-215992021-08-24T16:39:15Z Pre-emptive breeding against karnal bunt infection in common wheat: combining genomic and agronomic information to identify suitable parents Emebiri, L.C. Hildebrand, S. Tan, M.K. Juliana, P. Singh, P.K. Fuentes Dávila, G. Singh, R.P. AGRICULTURAL SCIENCES AND BIOTECHNOLOGY Karnal Bunt Resistance Genome-Wide Association Study GWAS Genomic Prediction Grain Yield KARNAL BUNT DISEASE RESISTANCE TILLETIA INDICA WHEAT TRITICUM AESTIVUM GENOMICS GRAIN Wheat (Triticum aestivum L.) is the most widely grown cereal crop in the world and is staple food to half the world’s population. The current world population is expected to reach 9.8 billion people by 2050, but food production is not expected to keep pace with demand in developing countries. Significant opportunities exist for traditional grain exporters to produce and export greater amounts of wheat to fill the gap. Karnal bunt, however, is a major threat, due to its use as a non-tariff trade barrier by several wheat-importing countries. The cultivation of resistant varieties remains the most cost-effective approach to manage the disease, but in countries that are free of the disease, genetic improvement is difficult due to quarantine restrictions. Here we report a study on pre-emptive breeding designed to identify linked molecular markers, evaluate the prospects of genomic selection as a tool, and prioritise wheat genotypes suitable for use as parents. In a genome-wide association (GWAS) study, we identified six DArTseq markers significantly linked to Karnal bunt resistance, which explained between 7.6 and 29.5% of the observed phenotypic variation. The accuracy of genomic prediction was estimated to vary between 0.53 and 0.56, depending on whether it is based solely on the identified Quantitative trait loci (QTL) markers or the use of genome-wide markers. As genotypes used as parents would be required to possess good yield and phenology, further research was conducted to assess the agronomic value of Karnal bunt resistant germplasm from the International Maize and Wheat Improvement Center (CIMMYT). We identified an ideal genotype, ZVS13_385, which possessed similar agronomic attributes to the highly successful Australian wheat variety, Mace. It is phenotypically resistant to Karnal bunt infection (<1% infection) and carried all the favourable alleles detected for resistance in this study. The identification of a genotype combining Karnal bunt resistance with adaptive agronomic traits overcomes the concerns of breeders regarding yield penalty in the absence of the disease. 2021-08-05T00:20:16Z 2021-08-05T00:20:16Z 2021 Article Published Version https://hdl.handle.net/10883/21599 10.3389/fpls.2021.675859 English https://figshare.com/collections/Pre-emptive_Breeding_Against_Karnal_Bunt_Infection_in_Common_Wheat_Combining_Genomic_and_Agronomic_Information_to_Identify_Suitable_Parents/5533635 CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose Open Access Switzerland Frontiers 12 1664-462X Frontiers in Plant Science 675859 |
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AGRICULTURAL SCIENCES AND BIOTECHNOLOGY Karnal Bunt Resistance Genome-Wide Association Study GWAS Genomic Prediction Grain Yield KARNAL BUNT DISEASE RESISTANCE TILLETIA INDICA WHEAT TRITICUM AESTIVUM GENOMICS GRAIN AGRICULTURAL SCIENCES AND BIOTECHNOLOGY Karnal Bunt Resistance Genome-Wide Association Study GWAS Genomic Prediction Grain Yield KARNAL BUNT DISEASE RESISTANCE TILLETIA INDICA WHEAT TRITICUM AESTIVUM GENOMICS GRAIN |
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AGRICULTURAL SCIENCES AND BIOTECHNOLOGY Karnal Bunt Resistance Genome-Wide Association Study GWAS Genomic Prediction Grain Yield KARNAL BUNT DISEASE RESISTANCE TILLETIA INDICA WHEAT TRITICUM AESTIVUM GENOMICS GRAIN AGRICULTURAL SCIENCES AND BIOTECHNOLOGY Karnal Bunt Resistance Genome-Wide Association Study GWAS Genomic Prediction Grain Yield KARNAL BUNT DISEASE RESISTANCE TILLETIA INDICA WHEAT TRITICUM AESTIVUM GENOMICS GRAIN Emebiri, L.C. Hildebrand, S. Tan, M.K. Juliana, P. Singh, P.K. Fuentes Dávila, G. Singh, R.P. Pre-emptive breeding against karnal bunt infection in common wheat: combining genomic and agronomic information to identify suitable parents |
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Wheat (Triticum aestivum L.) is the most widely grown cereal crop in the world and is staple food to half the world’s population. The current world population is expected to reach 9.8 billion people by 2050, but food production is not expected to keep pace with demand in developing countries. Significant opportunities exist for traditional grain exporters to produce and export greater amounts of wheat to fill the gap. Karnal bunt, however, is a major threat, due to its use as a non-tariff trade barrier by several wheat-importing countries. The cultivation of resistant varieties remains the most cost-effective approach to manage the disease, but in countries that are free of the disease, genetic improvement is difficult due to quarantine restrictions. Here we report a study on pre-emptive breeding designed to identify linked molecular markers, evaluate the prospects of genomic selection as a tool, and prioritise wheat genotypes suitable for use as parents. In a genome-wide association (GWAS) study, we identified six DArTseq markers significantly linked to Karnal bunt resistance, which explained between 7.6 and 29.5% of the observed phenotypic variation. The accuracy of genomic prediction was estimated to vary between 0.53 and 0.56, depending on whether it is based solely on the identified Quantitative trait loci (QTL) markers or the use of genome-wide markers. As genotypes used as parents would be required to possess good yield and phenology, further research was conducted to assess the agronomic value of Karnal bunt resistant germplasm from the International Maize and Wheat Improvement Center (CIMMYT). We identified an ideal genotype, ZVS13_385, which possessed similar agronomic attributes to the highly successful Australian wheat variety, Mace. It is phenotypically resistant to Karnal bunt infection (<1% infection) and carried all the favourable alleles detected for resistance in this study. The identification of a genotype combining Karnal bunt resistance with adaptive agronomic traits overcomes the concerns of breeders regarding yield penalty in the absence of the disease. |
format |
Article |
topic_facet |
AGRICULTURAL SCIENCES AND BIOTECHNOLOGY Karnal Bunt Resistance Genome-Wide Association Study GWAS Genomic Prediction Grain Yield KARNAL BUNT DISEASE RESISTANCE TILLETIA INDICA WHEAT TRITICUM AESTIVUM GENOMICS GRAIN |
author |
Emebiri, L.C. Hildebrand, S. Tan, M.K. Juliana, P. Singh, P.K. Fuentes Dávila, G. Singh, R.P. |
author_facet |
Emebiri, L.C. Hildebrand, S. Tan, M.K. Juliana, P. Singh, P.K. Fuentes Dávila, G. Singh, R.P. |
author_sort |
Emebiri, L.C. |
title |
Pre-emptive breeding against karnal bunt infection in common wheat: combining genomic and agronomic information to identify suitable parents |
title_short |
Pre-emptive breeding against karnal bunt infection in common wheat: combining genomic and agronomic information to identify suitable parents |
title_full |
Pre-emptive breeding against karnal bunt infection in common wheat: combining genomic and agronomic information to identify suitable parents |
title_fullStr |
Pre-emptive breeding against karnal bunt infection in common wheat: combining genomic and agronomic information to identify suitable parents |
title_full_unstemmed |
Pre-emptive breeding against karnal bunt infection in common wheat: combining genomic and agronomic information to identify suitable parents |
title_sort |
pre-emptive breeding against karnal bunt infection in common wheat: combining genomic and agronomic information to identify suitable parents |
publisher |
Frontiers |
publishDate |
2021 |
url |
https://hdl.handle.net/10883/21599 |
work_keys_str_mv |
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