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Tipo de Documento: Revista
Artículo
Autor : 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
Título : Multi environment multi QTL association mapping identifies disease resistance QTL in barley germplasm from Latin America
Título de la serie: Theoretical and Applied Genetics 128(3):501–516
Palabras clave : LOCUS DE RASGO CUANTITATIVO;OXIDO DE LA HOJA;OXIDO;RESISTENCIA A LA ENFERMEDAD;LOCUS DE RASGO CUANTITATIVO
Fecha de publicación : mar-2015
Código: *EC-INIAP-BEESC-MGC. Quito (Theoretical and Applied Genetics 128(3):501–516. 2015)
Páginas: p. 501–516
Estación: E. E. Santa Catalina
Resumen : 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.
Citación : Gutiérrez, L., Germán, S., Pereyra, S., Hayes, P.M., Pérez, C.A., Capettini, F., … Castro, A.J. ( march, 2015). Multi environment multi QTL association mapping identifies disease resistance QTL in barley germplasm from Latin America. Theoretical and Applied Genetics, 128(3), 501–516. doi: 10.1007/s00122-014-2448-y
URI : http://repositorio.iniap.gob.ec/handle/41000/4835
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