Maintaining Adequate Population Sizes for Seed Saving

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Maintaining adequate population sizes for seed saving and long-term preservation or stewardship of rare varieties at home.

Maintaining adequate population sizes for seed saving and long-term preservation or stewardship of rare varieties at home.

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  • this is a simplified illustration of cross-pollination.

Transcript

  • 1. POPULATION SIZE Seed Savers Exchange Grant Olson
  • 2. Our mission is to save North America’s diverse, but endangered, garden heritage for future generations by building a network of people committed to collecting, conserving, and sharing heirloom seeds and plants, while educating people about the value of genetic and cultural diversity.
  • 3. population size
  • 4. inbreeders and outbreeders
  • 5. inbreeders are primarily self- pollinating: pea, bean, tomato, lettuce outbreeders are primarily pollinated by other plants: cabbage, carrot, onion, melon generally, outbreeders require larger populations
  • 6. inbreeding depression
  • 7. deleterious alleles
  • 8. genetic drift image source: gringer
  • 9. over-selection
  • 10. extreme inbreeders: 10-20 plants
  • 11. moderate inbreeders: 40 plants
  • 12. outbreeders: 80 plants
  • 13. outbreeders sensitive to depression: 200 plants
  • 14. outbreeders not sensitive to depression: 10-20
  • 15. varietal history and population size
  • 16. planting size vs population size
  • 17. home vs commercial scale
  • 18. reacquiring genetic diversity
  • 19. use the SSE Yearbook to locate other growers maintaining your variety contact SSE directly for potential sources contact seed companies who have offered the variety in the past contact other seed banks or use USDA’s on-line GRIN database (www.ars-grin.gov/)
  • 20. additional resources
  • 21. for more information: Breed your own Vegetable Varieties, Carol Deppe Seed to Seed, Suzanne Ashworth The Organic Seed Grower, John Navazio A Seed Saving Guide for Gardeners and Farmers, OSA www.seedalliance.org/publications