A High-Density SNP and SSR Consensus Map Reveals Segregation Distortion Regions in WheatReport as inadecuate




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BioMed Research International - Volume 2015 2015, Article ID 830618, 10 pages -

Research Article

College of Agronomy, Northwest AandF University, Yangling, Shaanxi 712100, China

State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest AandF University, Yangling, Shaanxi 712100, China

Agronomy Department, Kansas State University, Manhattan, KS 66506, USA

Hard Winter Wheat Genetics Research Unit, USDA-ARS, Manhattan, KS 66506, USA

Cereal Crops Research Unit, USDA-ARS, Fargo, ND 58102, USA

Received 6 March 2015; Revised 16 August 2015; Accepted 27 August 2015

Academic Editor: Klaus Wimmers

Copyright © 2015 Chunlian Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.





Author: Chunlian Li, Guihua Bai, Shiaoman Chao, and Zhonghua Wang

Source: https://www.hindawi.com/



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