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5 Cards in this Set

  • Front
  • Back
dormancy
a state of inactive growth
purpose of dormancy
to survice adverse conditions
Types of Dormancy: Quiescence
dormancy imposed by external or environmental conditions

What triggers?
a) Unfavorable environmental conditions
b) External factor, such as hard seed coat
What causes?
Unfavorable environment; too dry, cold, hot, etc.

How to overcome?
Remove unfavorable environment
Types of Dormancy: Rest or Physiological Dormancy
dormancy imposed by internal or physiological conditions.
What triggers?
Environment:
a) short days (SD)
b) decreasing temperatures
What causes?
Internal physiology is unfavorable:
a) low level of growth promoters (e.g. auxin or gibberellic acid), and/or
b) high level of growth inhibitors (e.g. ABA)

How to overcome?
Give period of cold between 32-45 oF (0-7 oC), which satisfies the chilling requirement
chilling requirement
the number of hours of cold between 32-45 oF (0-7 oC) required to satisfy rest.