Detection of QTL for agronomic traits in an advanced backcross population with introgressions from wild barley (Hordeum vulgare ssp. spontaneum)

摘要

The objective of this study was to map QTL for yield, and yield determining traits in a BC2DH population derived from a cross between the spring barley cultivar 'Thuringia' and the wild barley accession ISR42-8 (H. v. ssp. spontaneum). Phenotypic datafor the traits: time to heading, plant height, ears per m2, thousand kernel weight and yield were recorded at four locations in Germany. The BC2DH population was genotyped with 69 SSR markers. We detected QTL for all analysed traits except for thousandkernel weight. QTL clustered at certain genomic regions indicating that these may be domestication related loci with strong effects. Favourable exotic alleles were detected for all traits including yield. We could thus show that QTL mapping in advanced backcross populations can uncover "cryptic" beneficial exotic alleles. These QTL are the basis for unraveling the genetic basis of yield and may eventually help breeding new cultivars.