Population structure and phenotypic variation of a spring barley world collection set up for association studies

Publication Type:Journal Article
Year of Publication:2010
Authors:Haseneyer, G, Stracke, S, Paul, C, Einfeldt, C, Broda, A, PIEPHO, H-P, GRANER, A, Geiger, HH
Journal:Plant Breeding
Date Published:2010
ISBN Number:1439-0523
Keywords:barley, genetic diversity, heritability, Hordeum, Hordeum vulgare, Population structure, SSR markers

With 3 figures and 4 tablesAbstract 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 × 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.

Short Title:Plant Breeding
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