Identification of QTLs for agronomic traits introgressed in an elite cultivar from a promising barley landrace.

Abstract

Crop landraces are of considerable importance as genetic resources, especially in breeding for biotic and abiotic stress. A group of Spanish barley landraces have shown to yield more than cultivars at low production sites. The best of these lines are being introduced through backcrosses in the national barley breeding program. The objective of this study is to identify favourable QTLs for interesting agronomic traits contributed by landrace line SBCC073, which might be useful when they are introgressed in elite cultivars. A population of 100 BC1F5 lines was derived from the cross between an elite cultivar (Orria) with high productivity and Spanish landrace (SBCC073) with high yielding at low production. A genetic linkage map was developed for this population using 1227 SNPs of good quality ge notyped with a DArTseq® genotyping - by - sequencing assay. The population of 100 BC1F5 lines was evaluated in the field in Zaragoza (Spain) during two years (2011, 2013) for grain yield (2011, 2013), flowering time and plant height (2013). A genetic map was c onstructed with programs Joinmap® and MSTMap. The genetic map resulted in 11 linkage groups, covering a total distance of 983 cM, with 4 complete chromosomes (1H, 3H, 4H and 5H) and three fragmented ones (2H, 6H and 7H). Three QTLs for grain for grain yiel d were detected in 2013, but for only one of them, on 5H, the yield increasing allele was contributed by SBCC073, whereas Orria alleles increased yield at QTL on 3H and 6H. Only one flowering time QTL was found, on chromosome 3H.

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