Population structure and phenotypic variation of a spring barley world collection set up for association studies
2010
Haseneyer, G. | Stracke, S. | Paul, C. | Einfeldt, C. | Broda, A. | Piepho, H.-P. | Graner, A. | Geiger, H.H.
With 3 figures and 4 tables Association mapping offers a tool to identify plant resources that carry important alleles for crop improvement and breeding. A necessary prerequisite for association mapping is a collection of genotypes representing a cross section of the examined germplasm. This study describes the genetic and phenotypic characterization of a collection of 224 spring barley (Hordeum vulgare L.) accessions sampled from the IPK gene bank. The analysis of the genetic structure of the collection was based on 45 EST-derived simple sequence repeat (SSR) markers and it revealed two major subgroups, mainly comprising two-rowed and six-rowed barleys, respectively. The phenotypic data were based on field trials performed at three locations in Germany in 2004 and 2005. Significant genotypic variation and genotype x environment interaction were observed for all traits under study (thousand-grain weight, crude protein content, starch content, plant height, and flowering time). For all analysed traits entry mean-based heritability estimates exceeded 0.9. After appropriately correcting for population structure and geographic origin significant associations between SSR markers and all traits under study were detected.
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