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Oat adaptation to Mediterranean climate: a critical analysis for association studies

AuthorsRispail, Nicolas CSIC ORCID ; Montilla-Bascón, Gracia CSIC ORCID; Sánchez-Martín, Javier CSIC ORCID; Flores, Fernando; Emeran, Amero A.; Sillero, Josefina C.; Langdon, Tim; Howarth, Catherine; Rubiales, Diego CSIC ORCID ; Prats, Elena CSIC ORCID
Mediterranean adaptation
Stress resistance
Genotype x environment interactions
Association studies
Issue DateJul-2016
Citation10th International Oat Conference (2016)
AbstractDuring the last 20 years there has been a steady state increase in the cultivated area of autumn sown oats within the Mediterranean area. However, in this area, the crop face hot and dry weather for which it is not particularly well adapted since traditionally oats has been grown in areas with cool and wet summers, such as Northwest Europe and Canada in which spring sowing is the standard practice. The low adaptation of northem material is reflected in a reduction of almost 3-fold in yield and highlights the need of identification of more resilient plants adapted to Mediterranean environments and crop practices. In this work, we used 141 Spanish landraces, genetically diverse and classified as red and white oats adapted to low and high altitude, and determined its adaptation to autumn sowings under Mediterranean agroecological conditions over 2 crop seasons at 4 contrasting locations in Spain, and Egypt. As expecte~ genotype x environment (GE) interactions was found for all assessed traits, including grain yield, biomass production, H index, :flowering and rust resistance, which is the most important disease reducing yield in the Mediterranean area. To test this GE interactions, heritability- adjusted genotype plus genotype x environment (HA-GGE), biplot analysis was performed. Resilience ofthe different genetic clusters was inferred from biplots together with the identification ofthe best discriminative locations, and those particular landraces with superior and stable characteristic for each assessed trait. Association analysis is a promising approach to overcome the limitations of conventional QTL mapping that has received increasing attention from plant geneticists during the last few years. However, when phenotyping is done under field conditions, the genotype x environment interactions may weaken the association found for particular makers. Taking advantage of the detailed genotype x environment interaction study performed and through the genotyping ofthe oat collection by DArT makers, we are performing a critica! analysis of association studies for agronomic traits by considering the use of different replications over years, locations, mega-environments, and the use of BLUPs and different models for inferring strong associations.
DescriptionTrabajo presentado en la 10th International Oat Conference, celebrada San Petersburgo del 11 al 15 de julio de 2016.
Appears in Collections:(IAS) Comunicaciones congresos

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