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Identifying allelic variants for papilla based powdery mildew adult plant resistance against powdery mildew in oat by association studies

AuthorsRispail, Nicolas ; Montilla-Bascón, Gracia ; Sánchez-Martín, Javier ; Langdon, Tim; Howarth, Catherine; Rubiales, Diego ; Prats, Elena
Issue DateOct-2014
Citation2nd Annual Conference of the SUSTAIN Action (2014)
AbstractCereal crops, including oats, generally show less powdery mildew infection on older plants than on seedlings. This field or ‘adult plant’ resistance (APR) is expressed by lateformed leaves of oats, barley and wheat although the magnitude differs among genotypes. This kind of resistance is highly interesting from the breeding point of view since it has insufficiently been deployed by breeding and can contribute to durability. Based on a collection of commercial varieties and landraces of oats we identified genotypes with adult plant resistance and further characterized the components of this resistance. Detailed study revealed a large increase of penetration and post-haustorial resistance in the older compared to the younger leaves. The collection was genotyped with 31 simple sequence repeat (SSR) and 15,000 Diversity Arrays Technology (DArT) markers to reveal association with adult plant resistance. 1872 polymorphic markers combining DArT and SSR markers were considered for association analysis. Following population structure and linkage disequilibrium analysis five different general and mixed linear models accounting for population structure and/or kinship corrections and two different statistical tests were carried out. One DArT sequence, oPt-5014, was strongly associated with powdery mildew rust resistance in adult plants. Characterization of the resistance sources and the associated markers will be useful for future breeding programs aiming to improve durable resistance.
DescriptionTrabajo presentado en la 2nd Annual Conference of the SUSTAIN Action, celebrada en Zakopane (Poland) del 15 al 17 de octubre de 2014.
Appears in Collections:(IAS) Comunicaciones congresos
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