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Euphytica

, Volume 193, Issue 3, pp 419–431 | Cite as

Association analysis of sugar yield-related traits in sorghum [Sorghum bicolor (L.)]

  • Peng Lv
  • Guisu Ji
  • Yucui Han
  • Shenglin Hou
  • Suying Li
  • Xue Ma
  • Ruiheng Du
  • Guoqing Liu
Article

Abstract

Association mapping is widely used for detecting QTLs in higher plants. In the present study a synthetic sorghum population containing 119 representative samples, including 43 sweet and 76 grain sorghum accessions originating mainly from China, USA and India, were genotyped using 51 simple-sequence repeat (SSR) markers. Linkage disequilibrium (LD) of pair-wise loci and population structure were analyzed, followed by association analysis of SSR loci and 3 sugar yield related traits using the TASSEL general linear model program. Results showed that: (i) different degrees of LD occurred among syntenic markers and also among nonsyntenic markers, indicating historical recombination among sorghum linkage groups; (ii) significant LD extended up to 7.31 cM; (iii) the collection of accessions was composed of three subgroups; (iv) four marker loci were associated with stalk sugar concentration, fresh stalk weight and stalk juice weight measured in different growing environments and could be used, therefore, in future marker assisted breeding programs. Several loci were also associated with two or more traits simultaneously, which might be due to tight linkage between different genes affecting these traits and/or pleiotropy. In addition, some associated markers were located close to QTLs previously mapped in family-based linkage mapping analyses.

Keywords

Sorghum bicolor SSR Population structure Association mapping 

Abbreviations

LD

Linkage disequilibrium

SSR

Simple sequence repeat

QTL

Quantitative trait loci

FSW

Fresh stalk weight

SJW

Stalk juice weight

Notes

Acknowledgments

This work was supported financially by a special fund for Agricultural Science, Technology and Innovation in Hebei, China (No. 2011055001) and China State Industrial System for Agricultural Research (CARS-06-01A).

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Peng Lv
    • 1
  • Guisu Ji
    • 1
  • Yucui Han
    • 1
  • Shenglin Hou
    • 1
  • Suying Li
    • 1
  • Xue Ma
    • 1
  • Ruiheng Du
    • 1
  • Guoqing Liu
    • 1
  1. 1.Institute of Millet CropsHebei Academy of Agricultural and Forestry SciencesShijiazhuangChina

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