1. Seed Dormancies Plant Propagation

2. Seed Terminology  Viable: the seed has a “living” embryo and is capable of germinating.  Germination test: The percentage of seed, in any given sample size, that actually germinate.  For example if you sowed 100 seeds and 86 out of the 100 germinated, what would the percent germination be?

3. Definition of Dormancy  The failure of a seed to germinate even though the requirements for successful seed germination are all present. –Moisture –Temperature –Oxygen –Sometimes light

4. Types of Seed Dormancies  Physical  Physiological  Photodormancy  Double Dormancy

5. Physical Dormancy CauseTreatments Seed has a hard seed coat is impermeable to water. *Scarification A – Acid B – Mechanical C – Hot Water

6. Physiological Dormancy CauseTreatments Seed has a dormant embryo.*Cold stratification A – moist B – aerated C – proper temperature D – proper time

7. Photodormancy CauseTreatments Seeds will not germinate until they are exposed to a certain amount of red light. *Expose seeds to red light. Seeds must first be in an imbibed state.

8. Double Dormancy CauseTreatments Combination of several different kinds of dormancies present in a seed at the same time. *Sequential treatments to handle each type of dormancy.

9. The End