Genetic characterization of a core collection of flax ( Linum usitatissimum L.) suitable for association mapping studies and evidence of divergent selection between fiber and linseed types

摘要: Flax is valued for its fiber, seed oil and nutraceuticals. Recently, the fiber industry has invested in development of products made from linseed stems, making it a dual purpose crop. Simultaneous targeting genomic regions controlling stem quality traits could enable cultivars. However, genetic diversity, population structure linkage disequilibrium (LD) patterns necessary association mapping (AM) have not yet been assessed flax because resources only recently developed. We characterized 407 globally distributed accessions using 448 microsatellite markers. The data was analyzed to assess suitability this core collection AM. Genomic scans identify candidate genes selected during divergent breeding process were conducted whole genome shotgun sequence flax. Combined analysis assigned all two major groups with six sub-groups. Population differentiation weak between (FST = 0.094) most pairwise comparisons among molecular coancestry indicated relatedness (mean = 0.287) individual pairs. Abundant diversity observed total panel (5.32 alleles per locus), some sub-groups showed high proportion private alleles. average genome-wide LD (r2) 0.036, relatively fast decay 1.5 cM. identified involved cell-wall biogenesis/modification, xylem identity fatty acid biosynthesis congruent previously other plant species. Based on abundant decay, we concluded that suitable AM studies multiple agronomic aiming at improvement as true Our provide first insights into affected by selection In combination AM, ability increase power detect loci influencing complex traits.