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Volume 38 Issue 12
Dec.  2011
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Article Contents

Development and high-throughput genotyping of substitution lines carring the chromosome segments of indica 9311 in the background of japonica Nipponbare

doi: 10.1016/j.jgg.2011.11.004
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  • Corresponding author: E-mail address: qqliu@yzu.edu.cn (Qiao-Quan Liu)
  • Received Date: 2011-07-30
  • Accepted Date: 2011-11-15
  • Rev Recd Date: 2011-11-06
  • Available Online: 2011-11-26
  • Publish Date: 2011-12-20
  • Chromosome segment substitution lines (CSSLs) are useful for the precise mapping of quantitative trait loci (QTLs) and dissection of the genetic basis of complex traits. In this study, two whole-genome sequenced rice cultivars, the japonica Nipponbare and indica 9311 were used as recipient and donor, respectively. A population with 57 CSSLs was developed after crossing and back-crossing assisted by molecular markers, and genotypes were identified using a high-throughput resequencing strategy. Detailed graphical genotypes of 38 lines were constructed based on resequencing data. These CSSLs had a total of 95 substituted segments derived fromindica 9311, with an average of about 2.5 segments per CSSL and eight segments per chromosome, and covered about 87.4% of the rice whole genome. A multiple linear regression QTL analysis mapped four QTLs for 1000-grain weight. The largest-effect QTL was located in a region on chromosome 5 that contained a cloned major QTL GW5/qSW5 for grain size in rice. These CSSLs with a background of Nipponbare may provide powerful tools for future whole-genome discovery and functional study of essential genes/QTLs in rice, and offer ideal materials and foundations for japonica breeding.
  • These authors contributed equally to this work.
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