Isolation Techniques for Seed Saving
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Transcript of Isolation Techniques for Seed Saving
ISOLATION TECHNIQUESSeed Savers Exchange
Grant Olson
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.
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.
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.
(flower structure)
anther produces pollen
seeds form in ovaryafter fertilization
stigmareceives pollen
grow only one variety
distance
Self-Pollinating, Perfect Flowers
Self-Pollinating, Perfect Flowers
Self-Pollinating, Perfect Flowers
Insect-Pollinated, Perfect Flowers
Insect-Pollinated, Perfect Flowers
Insect-Pollinated, Perfect Flowers
Insect-Pollinated, Imperfect Flowers
Insect-Pollinated, Monoecious Plants
Insect-Pollinated, Monoecious Plants
Insect-Pollinated, Monoecious Plants
Insect-Pollinated, Monoecious Plants
Wind-Pollinated, Monoecious Plants
Wind-Pollinated, Dioecious Plants
Insect-Pollinated, Self-Incompatible Plants
Wind-Pollinated, Self-Incompatible Plants
time
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?
barriers for self-pollinating plants
barriers for self-pollinating plants
barriers for insect-pollinated plants
barriers for insect-pollinated plants
barriers for insect-pollinated plants
barriers for wind-pollinated plants
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