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Targetting resistance effectors of rust and powdery mildew resistance in oat by association analysis. Pathogen-informed strategies for sustainable braod-spectrum crop resistance

AuthorsMontilla-Bascón, Gracia ; Rispail, Nicolas ; Sánchez-Martín, Javier ; Rubiales, Diego ; Mur, Luis A. J.; Langdon, Tim; Howarth, Catherine; Prats, Elena
Issue DateOct-2013
PublisherJames Hutton Institute
Institut national de la recherche agronomique (France)
Citation1st Annual Meeting "Pathogen-informed strategies for sustainable broad-spectrum crop resistance" (2013)
AbstractBiotic stresses such as rust and powdery mildew constitute major constraints for cereal crops. The purpose of this work was to identify elite alleles for rust and powdery mildew resistance in oat by association mapping to further tackle the effectors responsible of the resistance phenotype. To this aim, 176 oat accessions including white and red oat cultivars and landraces were evaluated for disease resistance and further genotyped with 31 simple sequence repeat (SSR) and 15,000 Diversity Arrays Technology (DArT) markers to reveal association with disease resistance traits. 1872 polymorphic markers combining DArT and SSR markers were considered for association analysis. Population structure was inferred using two different methods; Principal Component Analysis and a Bayesian clustering. In adittion, five different general and mixed linear models accounting for population structure and/or kinship corrections and two different statistical tests were carried out to reduce false positive. This analysis identified 7 marker alleles strongly associated with rust resistance. For powdery mildew resistance, only 1 marker at the limit of significance was found, probably due to the low phenotypic variation detected in the collection for powdery mildew resistance. Since the sequence of the DArT markers are known and long enough for blast analysis, we are currently carrying out blast of associated markers sequences for determining putative effectors associated with resistance to these biotrophic fungi in oat.
DescriptionPoster presentado en el 1st Annual Meeting "Pathogen-informed strategies for sustainable broad-spectrum crop resistance" celebrado en Birnam (Gran Bretaña) del 9 al 11 de octubre de 2013
Appears in Collections:(IAS) Comunicaciones congresos
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