Genetic structure and association mapping of adaptive and selective traits in the east Texas loblolly pine (Pinus taeda L.) breeding populations

摘要: First-generation selection (FGS) and second-generation (SGS) breeding populations of loblolly pine from east Texas were studied to estimate the genetic diversity, population structure, linkage disequilibrium (LD), signatures association traits with a genome-wide panel 4,264 single nucleotide polymorphisms (SNPs). Relatively high levels observed (Ho = 0.178–0.198) expected (He 0.180–0.198) heterozygosities in all populations. The amount inbreeding was very low many exhibiting slight excess heterozygotes. structure weak, but FST indicated more pronounced differentiation SGS As for outcrossing natural populations, LD low, marker density insufficient deduce decay rate. Numerous associations found between various phenotypic SNPs, only few remained significant after false positive correction. Signatures diversifying balancing markers representing important biological functions. These results present first step application marker-assisted (MAS) Western Gulf Forest Tree Improvement Program (WGFTIP) will contribute knowledgebase necessary genomic technology.