Fusiform rust resistance in loblolly pine, Pinus taeda L., is comprised of both polygenic and major gene effects. In this study, we applied a Bayesian approach to test for single nucleotide polymorphisms (SNPs) associated with resistance to fusiform rust, which is caused by Cronartium quercuum (Berk.) Miyabe ex Shirai f.sp. fusiforme. A population of 3810 clonal varieties from 100 full-sib families was produced through somatic embryogenesis and planted in replicated field experiments in the Southeastern United States. Rust phenotypes were measured after 6 growing seasons, and each of 863 clones from 35 full-sib families was genotyped with 3340 SNPs. We identified five associated SNPs with posterior probabilities of inclusion above 0.4 in the clonal population using a BayesCπ model. A second experiment was conducted with one of the identified SNPs (SNP2374) using seedlings from 2 full-sib families that were included in the first experiment. Resistant genotypes exhibited an overall infection rate of 11% compared to the susceptible genotype which had 57% infection. Using one of the full-sib families, we were able to map SNP2374 (CL1208Contig1-03-75) to linkage group 7. Confirmation of the SNP2374 association with rust resistance demonstrates the potential for selecting and screening genotypes to further reduce disease incidence in forest plantations of loblolly pine.

火炬松（Pinus taeda L.）的梭形抗锈性包括多基因效应和主要基因效应。在这项研究中，我们应用了贝叶斯方法来测试与梭形铁锈抗性有关的单核苷酸多态性（SNP），该铁锈性是由Cronartium quercuum（Berk。）Miyabe ex Shirai f.sp.造成的。梭形目。通过体细胞胚发生产生了来自100个同胞家族的3810个克隆品种，并在美国东南部的重复田间试验中种植。在6个生长季节后测量了锈表型，并用3340个SNP对来自35个全同胞家族的863个克隆进行了基因分型。我们使用BayesCπ模型确定了五个相关的SNP，它们在克隆群体中具有高于0.4的包含后验概率。使用其中一个已鉴定的SNP（SNP2374）中的一个，使用来自第一个实验的2个全同胞科的幼苗进行了第二个实验。与易感基因型感染率为57％相比，抗性基因型总体感染率为11％。使用全同胞家族之一，我们能够将SNP2374（CL1208Contig1-03-75）映射到连锁组7。