Molecular marker development from transcript sequences and germplasm evaluation for cultivated peanut (Arachis hypogaea L.)

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• 作者：Ze Peng ; Maria Gallo ; Barry L. Tillman ; Diane Rowland…
• 关键词：Peanut ; Diversity ; Marker ; Polymorphism ; Transcript ; SSR ; SNP
• 刊名：Molecular Genetics and Genomics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：291
• 期：1
• 页码：363-381
• 全文大小：1,831 KB
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• 作者单位：Ze Peng (1)
  Maria Gallo (2)
  Barry L. Tillman (1)
  Diane Rowland (1)
  Jianping Wang (1) (3)
  
  1. Agronomy Department, University of Florida, Gainesville, FL, 32610, USA
  2. Molecular Biosciences and Bioengineering Department, University of Hawai′i-Mānoa, Honolulu, HI, 96822, USA
  3. Genetics Institute, Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL, 32610, USA
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Cell Biology
  Biochemistry
  Microbial Genetics and Genomics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1617-4623

文摘

Molecular markers are important tools for genotyping in genetic studies and molecular breeding. The SSR and SNP are two commonly used marker systems developed from genomic or transcript sequences. The objectives of this study were to: (1) assemble and annotate the publicly available ESTs in Arachis and the in-house short reads, (2) develop and validate SSR and SNP markers, and (3) investigate the genetic diversity and population structure of the peanut breeding lines and the U.S. peanut mini core collection using developed SSR markers. An NCBI EST dataset with 252,951 sequences and an in-house 454 RNAseq dataset with 288,701 sequences were assembled separately after trimming. Transcript sequence comparison and phylogenetic analysis suggested that peanut is closer to cowpea and scarlet bean than to soybean, common bean and Medicago. From these two datasets, 6455 novel SSRs and 11,902 SNPs were identified. Of the discovered SSRs, 380 representing various SSR types were selected for PCR validation. The amplification rate was 89.2 %. Twenty-two (6.5 %) SSRs were polymorphic between at least one pair of four genotypes. Sanger sequencing of PCR products targeting 110 SNPs revealed 13 true SNPs between tetraploid genotypes and 193 homoeologous SNPs within genotypes. Eight out of the 22 polymorphic SSR markers were selected to evaluate the genetic diversity of Florida peanut breeding lines and the U.S. peanut mini core collection. This marker set demonstrated high discrimination power by displaying an average polymorphism information content value of 0.783, a combined probability of identity of 10−11, and a combined power of exclusion of 0.99991. The structure analysis revealed four sub-populations among the peanut accessions and lines evaluated. The results of this study enriched the peanut genomic resources, provided over 6000 novel SSR markers and the credentials for true peanut SNP marker development, and demonstrated the power of newly developed SSR markers in genotyping peanut germplasm and breeding materials. Keywords Peanut Diversity Marker Polymorphism Transcript SSR SNP