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Population structure in sorghum accessions from West Africa differing in race and maturity class

Genetica volume 139, pages 453–463 (2011)Cite this article

Abstract

Accounting for population structure to minimize spurious associations in association analyses is of crucial importance. With sorghum genomic sequence information being available, there is a growing interest in performing such association studies for a number of important agronomic traits using a candidate gene approach. The aims of our study were to conduct a systematic survey of molecular genetic diversity and analyze the population structure in cultivated sorghum [Sorghum bicolor (L.) Moench] accessions from West Africa. Our analysis included 219 West African cultivated sorghum accessions with differing maturity intended for a marker-trait association study. A total of 27 SSRs were used, which resulted in detection of 513 alleles. Genetic diversity estimates for the accessions were found to be high. The accessions were divided into two subgroups using a model-based approach. Our findings partly agree with previous studies in that the guinea race accessions could be distinguished clearly from other accessions included in the analysis. Race and geographical origin of the accessions may be responsible for the structure we observed in our material. The extent of linkage disequilibrium for all combinations of SSRs was in agreement with expectations based on the mating system.

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Acknowledgments

This research was funded by the Federal Ministry for Economic Cooperation and Development, Germany (ICRISAT/GTZ Project No. 05.7860.9-001.00). We thank two anonymous reviewers for their valuable comments.

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Authors and Affiliations

  1. Institute of Plant Breeding, Seed Science, and Population Genetics, University of Hohenheim, 70593, Stuttgart, Germany

    Sankalp U. Bhosale, Albrecht E. Melchinger & Heiko K. Parzies

  2. Max Planck Institute for Plant Breeding Research, 50829, Köln, Germany

    Benjamin Stich

  3. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) Bamako, BP 320, Bamako, Mali

    H. Frederick W. Rattunde & Eva Weltzien

  4. ICRISAT Niamey, BP 12404, Niamey, Niger

    Bettina I. G. Haussmann

  5. ICRISAT, Patancheru, AP, 502324, India

    C. Thomas Hash

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  1. Sankalp U. Bhosale
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  2. Benjamin Stich
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  3. H. Frederick W. Rattunde
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Correspondence to Heiko K. Parzies.

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Bhosale, S.U., Stich, B., Rattunde, H.F.W. et al. Population structure in sorghum accessions from West Africa differing in race and maturity class. Genetica 139, 453–463 (2011). https://doi.org/10.1007/s10709-011-9564-2

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Keywords

  • Sorghum
  • Genetic diversity
  • Population structure
  • Linkage disequilibrium

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