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Origins of Cultivated Plants

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Chapter 2 Why were plants domesticated? Steady food source. Higher TDN Storage Methods of Domestication Seed or sexual propagation Cereal grain among the first ... – PowerPoint PPT presentation

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Title: Origins of Cultivated Plants


1
Origins of Cultivated Plants
  • Chapter 2

2
Why were plants domesticated?
  • Steady food source.
  • Higher TDN
  • Storage

3
Methods of Domestication
  • Seed or sexual propagation
  • Cereal grain among the first
  • Shattering Vs non-shattering types
  • Plant close together
  • Seed dormancy
  • Selection pressures

4
Two main Regions
  • Old World Asia and Asia Minor
  • Fertile Crescent eastern end of the
    Mediterranean Sea and Central Asia
  • New World Central Mexico to Chile

5
Domestication of Plants
  • 8000 9000 B.C. evidence of agricultural
    villages.
  • Radio carbon dating suggests 5000 6000 B.C.
  • Africa 4000 B.C.
  • Chinese 4000 B.C.

6
New Crops and New Uses
  • American farmers produce highest yields in the
    world.
  • Develop new crops and new markets

7
The Big Four
  • Rice
  • Wheat
  • Corn
  • Potatoes

8
Rice
  • Feeds over half of the world
  • There are 25 species
  • Mutations and hybrid response for improvements
  • Short, medium and long

9
Wheat
  • White Red
  • Hybrids has increased vigor
  • Hard to increase yields because of self
    pollination

10
Corn
  • Cultures based on corn
  • Corn mutates easily
  • Important for its color size and shape
  • Hybrid corn in 1930s

11
Potato
  • When planted from seed much different from
    parents
  • Selection/tuber division
  • Seed tubers

12
Hatch Act of 1887
  • Experiment stations at each of the land-grand
    colleges.
  • Davis Berkley

13
Surplus
  • Marketing Plans
  • Produce the think about selling.

14
Germ Plasm
  • Introduction-new plant materials
  • Maintenance-banks and collections
  • Evaluation- screening and tests
  • Distribution-made free of charge to scientists

15
Why Protect our germ plasm
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