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Abundance, marker development and genetic mapping of microsatellites from unigenes in Brassica napus

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Abstract

Rapeseed (Brassica napus) is the second most important oil crop in the world after soybean. The repertoire of simple sequence repeat (SSR) markers for rapeseed is limited and warrants a search for a larger number of polymorphic SSRs for germplasm characterization and breeding applications. In this study, a total of 5,310 SSR-containing unigenes were identified from a set of 46,038 B. napus unigenes with an average density of one SSR every 5.75 kb. A set of 1,000 expressed sequence tag (EST)-SSR markers with repeat length ≥18 bp were developed and tested for their ability to detect polymorphism among a panel of six rapeseed varieties. Of these SSR markers, 776 markers detected clear amplification products, and 511 displayed polymorphisms among the six varieties. Of these polymorphic markers, 195 EST-SSR markers, corresponding to 233 loci, were integrated into an existing B. napus linkage map. These EST-SSRs were randomly distributed on the 19 linkage groups of B. napus. Of the mapped loci, 166 showed significant homology to Arabidopsis genes. Based on the homology, 44 conserved syntenic blocks were identified between B. napus and Arabidopsis genomes. Most of the syntenic blocks were consistent with the duplication and rearrangement events identified previously. In addition, we also identified three previously unreported blocks in B. napus. A subset of 40 SSRs was used to assess genetic diversity in a collection of 192 rapeseed accessions. The polymorphism information content of these markers ranged from 0.0357 to 0.6753 with an average value of 0.3373. These results indicated that the EST-SSR markers developed in this study are useful for genetic mapping, molecular marker-assisted selection and comparative genomics.

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Acknowledgments

The research was supported by the National Natural Science Foundation of China (No. 31071452) and the Doctoral Fund of Ministry of Education of China (No. 20100146110019).

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Authors and Affiliations

  1. National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China

    Fang Wang, Xiaofeng Wang, Xun Chen, Yingjie Xiao, Haitao Li, Shunchang Zhang, Jinsong Xu, Jie Fu, Lei Huang, Chao Liu, Jiangsheng Wu & Kede Liu

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  1. Fang Wang
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  2. Xiaofeng Wang
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  3. Xun Chen
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  12. Kede Liu
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Correspondence to Kede Liu.

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Wang, F., Wang, X., Chen, X. et al. Abundance, marker development and genetic mapping of microsatellites from unigenes in Brassica napus . Mol Breeding 30, 731–744 (2012). https://doi.org/10.1007/s11032-011-9658-7

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