Theoretical and Applied Genetics

, Volume 123, Issue 5, pp 693–704 | Cite as

Genetic diversity and population structure in cultivated sunflower and a comparison to its wild progenitor, Helianthus annuus L

  • J. R. Mandel
  • J. M. Dechaine
  • L. F. Marek
  • J. M. Burke
Original Paper

Abstract

Crop germplasm collections are valuable resources for ongoing plant breeding efforts. To fully utilize such collections, however, researchers need detailed information about the amount and distribution of genetic diversity present within collections. Here, we report the results of a population genetic analysis of the primary gene pool of sunflower (Helianthus annuus L.) based on a broad sampling of 433 cultivated accessions from North America and Europe, as well as a range-wide collection of 24 wild sunflower populations. Gene diversity across the cultivars was 0.47, as compared with 0.70 in the wilds, indicating that cultivated sunflower harbors roughly two-thirds of the total genetic diversity present in wild sunflower. Population structure analyses revealed that wild sunflower can be subdivided into four genetically distinct population clusters throughout its North American range, whereas the cultivated sunflower gene pool could be split into two main clusters separating restorer lines from the balance of the gene pool. Use of a maximum likelihood method to estimate the contribution of the wild gene pool to the cultivated sunflower germplasm revealed that the bulk of the cultivar diversity is derived from two wild sunflower population genetic clusters that are primarily composed of individuals from the east-central United States, the same general region in which sunflower domestication is believed to have occurred. We also identified a nested subset of accessions that capture as much of the allelic diversity present within the sampled cultivated sunflower germplasm collection as possible. At the high end, a core set of 288 captured nearly 90% of the alleles present in the full set of 433, whereas a core set of just 12 accessions was sufficient to capture nearly 50% of the total allelic diversity present within this sample of cultivated sunflower.

Supplementary material

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Online Resource Tables (PDF 525 kb)
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Online Resource Figure 1 (PDF 596 kb)
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Online Resource Figure 4 (PDF 359 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • J. R. Mandel
    • 1
  • J. M. Dechaine
    • 2
  • L. F. Marek
    • 3
  • J. M. Burke
    • 1
  1. 1.Miller Plant SciencesUniversity of GeorgiaAthensUSA
  2. 2.University Way Central Washington UniversityEllensburgUSA
  3. 3.Iowa State UniversityAmesUSA

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