title: A High-Density SNP and SSR Consensus Map Reveals Segregation Distortion Regions in Wheat.
abstract: Segregation distortion is a widespread phenomenon in plant and animal genomes and significantly affects linkage map construction and identification of quantitative trait loci (QTLs). To study segregation distortion in wheat, a high-density consensus map was constructed using single nucleotide polymorphism (SNP) and simple sequence repeat (SSR) markers by merging two genetic maps developed from two recombinant-inbred line (RIL) populations, Ning7840 × Clark and Heyne × Lakin. Chromosome regions with obvious segregation distortion were identified in the map. A total of 3541 SNPs and 145 SSRs were mapped, and the map covered 3258.7 cM in genetic distance with an average interval of 0.88 cM. The number of markers that showed distorted segregation was 490 (18.5%) in the Ning7840 × Clark population and 225 (10.4%) in the Heyne × Lakin population. Most of the distorted markers (630) were mapped in the consensus map, which accounted for 17.1% of mapped markers. The majority of the distorted markers clustered in the segregation distortion regions (SDRs) on chromosomes 1B, 2A, 2B, 3A, 3B, 4B, 5A, 5B, 5D, 6B, 7A, and 7D. All of the markers in a given SDR skewed toward one of the parents, suggesting that gametophytic competition during zygote formation was most likely one of the causes for segregation distortion in the populations.
authors.affiliation: College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China ; State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, Shaanxi 712100, China ; Agronomy Department, Kansas State University, Manhattan, KS 66506, USA.
authors.forename: Chunlian
authors.initials: C
authors.lastname: Li
authors.affiliation: Agronomy Department, Kansas State University, Manhattan, KS 66506, USA ; Hard Winter Wheat Genetics Research Unit, USDA-ARS, Manhattan, KS 66506, USA.
authors.forename: Guihua
authors.initials: G
authors.lastname: Bai
authors.affiliation: Cereal Crops Research Unit, USDA-ARS, Fargo, ND 58102, USA.
authors.forename: Shiaoman
authors.initials: S
authors.lastname: Chao
authors.affiliation: College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China ; State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Wang
mesh_terms: D032461:Chromosomes, Plant / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D040641:Quantitative Trait Loci; D012091:Repetitive Sequences, Nucleic Acid; D014908:Triticum / Q000235:genetics*