Isolation Techniques for Seed Saving

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Isolation techniques for seed saving and preserving the characteristics of varieties in subsequent generations, including hand-pollination, mesh barriers and isolation by distance. Video is here: http://www.youtube.com/watch?v=Bb5uoPzY5EU&

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  • this is a simplified illustration of cross-pollination.
  • despite having perfect flowers, several crops are potential outcrossers – pollen often moves between flowers and between plants
  • despite having perfect flowers, several crops are potential outcrossers – pollen often moves between flowers and between plants
  • despite having perfect flowers, several crops are potential outcrossers – pollen often moves between flowers and between plants
  • Isolation Techniques for Seed Saving

    1. 1. ISOLATION TECHNIQUES Seed Savers Exchange Grant Olson
    2. 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. 3. Seed saving is the process of saving seeds from open- pollinated fruits, vegetables, grains, flower s & herbs. Open-pollinated varieties are maintained by allowing pollen to flow only between plants of the same variety. When pollen flows between different varieties within the same species, this is known as cross-pollination.
    4. 4. Cross-pollinated seed is not ideal for seed saving. Some form of isolation may be necessary to prevent cross- pollination between plants of different varieties within the same species. Depending on your plants and your environment, isolation may not be required.
    5. 5. (flower structure) anther produces pollen seeds form in ovary after fertilization stigma receives pollen
    6. 6. grow only one variety
    7. 7. distance
    8. 8. Self-Pollinating, Perfect Flowers
    9. 9. Self-Pollinating, Perfect Flowers
    10. 10. Self-Pollinating, Perfect Flowers
    11. 11. Insect-Pollinated, Perfect Flowers
    12. 12. Insect-Pollinated, Perfect Flowers
    13. 13. Insect-Pollinated, Perfect Flowers
    14. 14. Insect-Pollinated, Imperfect Flowers
    15. 15. Insect-Pollinated, Monoecious Plants
    16. 16. Insect-Pollinated, Monoecious Plants
    17. 17. Insect-Pollinated, Monoecious Plants
    18. 18. Insect-Pollinated, Monoecious Plants
    19. 19. Wind-Pollinated, Monoecious Plants
    20. 20. Wind-Pollinated, Dioecious Plants
    21. 21. Insect-Pollinated, Self-Incompatible Plants
    22. 22. Wind-Pollinated, Self-Incompatible Plants
    23. 23. time
    24. 24. Is physical isolation required? • are different varieties of your crop/species being grown within the pollination zone? • are these different varieties flowering at the same time as your plants?
    25. 25. barriers for self-pollinating plants
    26. 26. barriers for self-pollinating plants
    27. 27. barriers for insect-pollinated plants
    28. 28. barriers for insect-pollinated plants
    29. 29. barriers for insect-pollinated plants
    30. 30. barriers for wind-pollinated plants
    31. 31. for more information: Seed to Seed, Suzanne Ashworth The Organic Seed Grower, John Navazio A Seed Saving Guide for Gardeners and Farmers, OSA www.seedalliance.org/publications SSE Webinars www.seedsavers.org/webinars

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