3. Addressing Grower Needs
“Breeding, Research, and Education Needs Assessment for
Organic Vegetable Growers in the Northeast”
Hultengren, Glos and Mazourek 2016
https://ecommons.cornell.edu/handle/1813/44636
210 growers
responded to a survey
sent to over 1,000
growers in the
Northeast.
Working group of
researchers, students,
growers, extension,
and seed companies
reviewed responses.
4. Crops Prioritized by Growers for Cultivar Development
Arugula
AsianGreens
Basil
Beet
Broccoli
BrusselsSprouts
Cabbage
Carrot
Cilantro
Cucumber
Cucurbits
Eggplant
FavaBean
Garlic
GreenBean
Kale
Leek
Lettuce
Melon
Mustard
Okra
Onion
Parsnip
Pea
Pepper
Potato
Radish
Shallot
Spinach
SummerSquash
SweetCorn
SwissChard
Tomato
Watermelon
WinterSquash
Cauliflower
Celery
Certified Organic Grower Responses
Responses from growers
7. Define Seed Resources
• Learn what others are growing in your area
• Ask at conferences like this!
• Call seed suppliers for recommendations
• Organic variety trial database www.eorganic.info
• www.pickacarrot.com – like google for seeds
• Seed Savers Exchange
• Regional seed groups
12. Requesting PI Accessions from
NPGS (GRIN)
• Cultivar – distinct plant germplasm grown
in agriculture
• Line – true breeding plant germplasm that
may be appropriate for use as a cultivar
• Accession – a sample of seed that was
collected, can include mixture
13. Requesting PI Accessions from
NPGS (GRIN)
• Accession – a sample of seed that was
collected, can include mixture
• Potential for disease
• Not all individuals will have trait you seek
• Balance benefit of request with erosion of
genetic diversity collected from nature
18. Flowers Can Hint toward Best
Pollination and Breeding Approaches
• Plant that tend to self-pollinate tend to have perfect
flowers (pollen and pistil on each flower)
• These can often be self-pollinated with little to no
inbreeding depression
• There are exceptions
• Plants that tend to outcross tend to have separate
male and female flowers tend to outcross
• These can often show inbreeding depression
• There are exceptions
19. Peppers
• Perfect flowers
• Self-pollinate readily
• In the field outcross at about 20%
depending on pollinators present
• Emasculated bud serves as female
• Pollinated by open flower shedding pollen
20. Broccoli- an exception
• Perfect flowers but
• Will not self-pollinate
• Exhibits inbreeding depression
• Self-incompatibility common in brassica
• Reject pollen similar to themselves
• Promotes outcrossing
• Circumvent by pollinating like a pepper (bud pollination)
• Cytoplasmic male sterility introduced
• Controversial
• Facilitates hybrid seed production
21. Cucumbers
• Monoecious, Gynoecious and more
• No real inbreeding depression
• Although separate male and female flowers
require vector
• Hybrids easily generated by planting
gynoecious alongside monoecious plants
• Seed increase of gynoecious plants by use
of silver or hormones
22. Mendel
• Alleles – different forms for a gene that control a trait
• Dominant allele – written in CAPITAL LETTERS
• Recesive allele – written in smalls
• True Breeding = Homozygous
• Cross dominant plant x recessive plant
• Heterozygous offspring
•AA x aa => Aa F1
23. Breeding with Hybrids
Dominant traits
• only needs to be inherited from one parent to appear in
progeny – see it in the F1
• visible if present
Recessive traits
• needs to be inherited from both parents to appear in progeny
• plant can be an invisible carrier
Hybrid with dominant trait
• may or may not be true breeding
• Common for disease resistance
Hybrid with recessive trait
• progeny will be true breeding
• Common for domestication traits