isolation techniques for seed saving
DESCRIPTION
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&TRANSCRIPT
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ISOLATION TECHNIQUESSeed Savers Exchange
Grant Olson
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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.
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Seed saving is the process of saving seeds from open-pollinated fruits, vegetables, grains, flowers & herbs.
Open-pollinated varieties are maintained by allowing pollen to flow only between plantsof the same variety.
When pollen flows between different varieties within the same species, this is known as cross-pollination.
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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.
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(flower structure)
anther produces pollen
seeds form in ovaryafter fertilization
stigmareceives pollen
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grow only one variety
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distance
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Self-Pollinating, Perfect Flowers
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Self-Pollinating, Perfect Flowers
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Self-Pollinating, Perfect Flowers
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Insect-Pollinated, Perfect Flowers
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Insect-Pollinated, Perfect Flowers
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Insect-Pollinated, Perfect Flowers
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Insect-Pollinated, Imperfect Flowers
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Insect-Pollinated, Monoecious Plants
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Insect-Pollinated, Monoecious Plants
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Insect-Pollinated, Monoecious Plants
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Insect-Pollinated, Monoecious Plants
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Wind-Pollinated, Monoecious Plants
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Wind-Pollinated, Dioecious Plants
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Insect-Pollinated, Self-Incompatible Plants
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Wind-Pollinated, Self-Incompatible Plants
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time
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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?
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barriers for self-pollinating plants
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barriers for self-pollinating plants
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barriers for insect-pollinated plants
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barriers for insect-pollinated plants
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barriers for insect-pollinated plants
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barriers for wind-pollinated plants
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for more information:
Seed to Seed, Suzanne Ashworth
The Organic Seed Grower,John Navazio
A Seed Saving Guide for Gardeners and Farmers, OSAwww.seedalliance.org/publications
SSE Webinarswww.seedsavers.org/webinars