Review for Final Organic Seed

1
Review for FinalOrganic Seed

• John Navazio
• Organic Seed Alliance

2
Self-Pollinated Species

• Why dont they get inbreeding depression?
• Can they be selected narrowly?
• When growing seed and selecting to type how
  narrow can one go? Why?
• What are the advantages of selecting widely? Why?
  How do you accomplish it?
• What are the advantages of selecting widely?
  Contrast this type of selection for a seed
  grower/saver/plant breeder.

3
Cross-Pollinated Species

• Why are crossers more apt to get inbreeding
  depression? How can one avoid inbreeding
  depression?
• What are the consequences of selecting too
  narrowly? Why?
• If you grow seed of a crosser w out doing
  selection what are the possible outcomes?
• What the kind of population sizes that you must
  start with to have a healthy crosser if a)
  biennial b) the variety has problems, c) the
  variety is stable, or d) the variety is a
  Cucurbit?

4
Isolation Distances

• Is there such a thing as an absolute isolation
  distance? Why or why not?
• What are the circumstances under which less
  isolation distance is adequate?
• What are the circumstances under which more
  isolation distance is adequate?
• What species require more isolation?
• What species require less? Why?

5
Conducting Trials

• What are the reasons for doing trials?
• When should trials be conducted?
• What type of varieties should always be included
  in trials?
• What environments should trials be conducted in?
  How often? When?
• How can trials benefit your seed growing
  activities?

6
Diseases of Crops

• Contrast and compare Horizontal Resistance (HR)
  and Vertical Resistance (VR) to diseases. Be
  specific with advantages vs. disadvantages of
  both.
• Why have commercial breeders embraced VR, despite
  its shortcomings?
• Why is HR so well suited to organics?
• Why are the genetics of HR more appropriate for
  population selection?