14 Pags.- Figs.- Fots. Copia de la presentación expuesta (Comunicación oral) por la primera autora en el II Spanish Symposium on Cereal Physiology and Breeding of Cereals. Este simposio fue organizado por el Rectorado de la Universidad de Córdoba (UCO) como parte de las actividades de la Red de Excelencia científica «Fisiología del Rendimiento y Calidad para la Mejora de Cereales» (FiRCMe). http://sefimec.csic.es/ Under Creative Commons License Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)., The Spanish Barley Core Collection (SBCC) presents a wide range of adaptation traits to Mediterranean environments. Some of the SBCC lines have shown good performance in low productivity sites and, thus, they could be good candidates to introgress drought adaptation to commercial cultivars. To that purpose, two backcross populations (BC2F5) were developed using two SBCC landraces (SBCC042 and SBCC073) as donor parents and the elite cultivar Cierzo as recurrent parent. Genotyping of 264 lines of each backcross was carried out using the Barley Illumina iSelect 50k SNPchip, which provided a good genome coverage for both populations. We carried out three years of field trials, in Zaragoza (Spain), the last one of them used for QTL validation. The use of two distinct populations led us to find interesting hotspots. Among them, QTL for test weight and kernel weight open the possibility of exploiting the Spanish landraces as source of variability for agronomic and quality traits.
On chromosome 1H, we found a region in 503 – 526 Mb, which involved flowering time, kernel weight and test weight, co-locating with the locus Thresh-1 (threshability1) and an arabinoxylan content QTL2. In addition, a plant height and kernel weight QTL on 5H coincided with a region for grain plumpness reported in the literature3. Another important region was found on 6H, related with yield and quality traits. The confidence interval of this hotspot covered a long extension of the chromosome, overlapping yield, height and kernel weight. For this QTL region, lower productivity was concurrent with taller plants and heavier kernels, all contributed by the landrace allele. Strategies to use the QTL found for breeding and pre-breeding purposes will be discussed., This work was supported by Spanish Ministry of Economy, Industry and Competitiveness grants AGL2013-48756-R, AGL2016-80967-R, RFP2012-00015-00-00, RFP2015 00006-00-00, and RTA2012-00033-C03-02. AM was funded by the Spanish Ministry of Economy, Industry and Competitiveness grant no. BES-2014-069266 (linked to project AGL2013-48756-R)., Peer reviewed