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5 Cards in this Set
- Front
- Back
dormancy
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a state of inactive growth
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purpose of dormancy
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to survice adverse conditions
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Types of Dormancy: Quiescence
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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 |
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Types of Dormancy: Rest or Physiological Dormancy
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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 |
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chilling requirement
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the number of hours of cold between 32-45 oF (0-7 oC) required to satisfy rest.
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