Multi environment multi QTL association mapping identifies disease resistance QTL in barley germplasm from Latin America
Diseases represent a major constraint for barley (Hordeum vulgare L.) production in Latin America. Spot blotch (caused by Cochliobolus sativus), stripe rust (caused by Puccinia striiformis f.sp. hordei) and leaf rust (caused by Puccinia hordei) are three of the most important diseases that affect th...
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ir-:41000-48352018-03-26T16:08:14Z Multi environment multi QTL association mapping identifies disease resistance QTL in barley germplasm from Latin America Theoretical and Applied Genetics 128(3):501–516 Gutiérrez, Lucia Germán, Silvia Pereyra, Silvia Hayes, Patrick M. Pérez, Carlos A. Capettini, Flavio Locatelli, Andrés Berberian, Natalia M. Falconí-Castillo, Esteban Estrada, Rigoberto Fros, Dario Gonza, Víctor Altamirano, Hernán Huerta-Espino, Julio Neyra, Edgar LOCUS DE RASGO CUANTITATIVO OXIDO DE LA HOJA OXIDO RESISTENCIA A LA ENFERMEDAD LOCUS DE RASGO CUANTITATIVO Diseases represent a major constraint for barley (Hordeum vulgare L.) production in Latin America. Spot blotch (caused by Cochliobolus sativus), stripe rust (caused by Puccinia striiformis f.sp. hordei) and leaf rust (caused by Puccinia hordei) are three of the most important diseases that affect the crop in the region. Since fungicide application is not an economically or environmentally sound solution, the development of durably resistant varieties is a priority for breeding programs. Therefore, new resistance sources are needed. The objective of this work was to detect genomic regions associated with field level plant resistance to spot blotch, stripe rust, and leaf rust in Latin American germplasm. Disease severities measured in multi-environment trials across the Americas and 1,096 SNPs in a population of 360 genotypes were used to identify genomic regions associated with disease resistance. Optimized experimental design and spatial modeling were used in each trial to estimate genotypic means. Genome-Wide Association Mapping (GWAS) in each environment was used to detect Quantitative Trait Loci (QTL). All significant environment-specific QTL were subsequently included in a multi-environment-multi-QTL (MEMQ) model. Geographical origin and inflorescence type were the main determinants of population structure. Spot blotch severity was low to intermediate while leaf and stripe rust severity was high in all environments. Mega-environments were defined by locations for spot blotch and leaf rust. Significant marker-trait associations for spot blotch (9 QTL), leaf (6 QTL) and stripe rust (7 QTL) and both global and environment-specific QTL were detected that will be useful for future breeding efforts. 2018-02-22T17:01:50Z 2018-02-22T17:01:50Z 2015-03 Revista Artículo *EC-INIAP-BEESC-MGC. Quito (Theoretical and Applied Genetics 128(3):501–516. 2015) http://repositorio.iniap.gob.ec/handle/41000/4835 en p. 501–516 application/pdf E. E. Santa Catalina |
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LOCUS DE RASGO CUANTITATIVO OXIDO DE LA HOJA OXIDO RESISTENCIA A LA ENFERMEDAD LOCUS DE RASGO CUANTITATIVO |
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LOCUS DE RASGO CUANTITATIVO OXIDO DE LA HOJA OXIDO RESISTENCIA A LA ENFERMEDAD LOCUS DE RASGO CUANTITATIVO Gutiérrez, Lucia Germán, Silvia Pereyra, Silvia Hayes, Patrick M. Pérez, Carlos A. Capettini, Flavio Locatelli, Andrés Berberian, Natalia M. Falconí-Castillo, Esteban Estrada, Rigoberto Fros, Dario Gonza, Víctor Altamirano, Hernán Huerta-Espino, Julio Neyra, Edgar Multi environment multi QTL association mapping identifies disease resistance QTL in barley germplasm from Latin America |
description |
Diseases represent a major constraint for barley (Hordeum vulgare L.) production in Latin America. Spot blotch (caused by Cochliobolus sativus), stripe rust (caused by Puccinia striiformis f.sp. hordei) and leaf rust (caused by Puccinia hordei) are three of the most important diseases that affect the crop in the region. Since fungicide application is not an economically or environmentally sound solution, the development of durably resistant varieties is a priority for breeding programs. Therefore, new resistance sources are needed. The objective of this work was to detect genomic regions associated with field level plant resistance to spot blotch, stripe rust, and leaf rust in Latin American germplasm. Disease severities measured in multi-environment trials across the Americas and 1,096 SNPs in a population of 360 genotypes were used to identify genomic regions associated with disease resistance. Optimized experimental design and spatial modeling were used in each trial to estimate genotypic means. Genome-Wide Association Mapping (GWAS) in each environment was used to detect Quantitative Trait Loci (QTL). All significant environment-specific QTL were subsequently included in a multi-environment-multi-QTL (MEMQ) model. Geographical origin and inflorescence type were the main determinants of population structure. Spot blotch severity was low to intermediate while leaf and stripe rust severity was high in all environments. Mega-environments were defined by locations for spot blotch and leaf rust. Significant marker-trait associations for spot blotch (9 QTL), leaf (6 QTL) and stripe rust (7 QTL) and both global and environment-specific QTL were detected that will be useful for future breeding efforts. |
author |
Gutiérrez, Lucia Germán, Silvia Pereyra, Silvia Hayes, Patrick M. Pérez, Carlos A. Capettini, Flavio Locatelli, Andrés Berberian, Natalia M. Falconí-Castillo, Esteban Estrada, Rigoberto Fros, Dario Gonza, Víctor Altamirano, Hernán Huerta-Espino, Julio Neyra, Edgar |
author_facet |
Gutiérrez, Lucia Germán, Silvia Pereyra, Silvia Hayes, Patrick M. Pérez, Carlos A. Capettini, Flavio Locatelli, Andrés Berberian, Natalia M. Falconí-Castillo, Esteban Estrada, Rigoberto Fros, Dario Gonza, Víctor Altamirano, Hernán Huerta-Espino, Julio Neyra, Edgar |
author_sort |
Gutiérrez, Lucia |
title |
Multi environment multi QTL association mapping identifies disease resistance QTL in barley germplasm from Latin America |
title_short |
Multi environment multi QTL association mapping identifies disease resistance QTL in barley germplasm from Latin America |
title_full |
Multi environment multi QTL association mapping identifies disease resistance QTL in barley germplasm from Latin America |
title_fullStr |
Multi environment multi QTL association mapping identifies disease resistance QTL in barley germplasm from Latin America |
title_full_unstemmed |
Multi environment multi QTL association mapping identifies disease resistance QTL in barley germplasm from Latin America |
title_sort |
multi environment multi qtl association mapping identifies disease resistance qtl in barley germplasm from latin america |
publishDate |
2018 |
url |
http://repositorio.iniap.gob.ec/handle/41000/4835 |
_version_ |
1635512046015479808 |
score |
11,871979 |