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Control and Release
of Seed Dormancy
1626011
Content
1. Introduction
2. What Is Seed Dormancy
3. Dormancy
4. Scarification
5. Temperature
6. Pressure
7. Light/dark
8. Carbon dioxide
9. Induction of Dormancy by Chemicals
10. Chemical Compounds that break seed dormancy
Introduction
• Sometimes seed are sown that do not have
the capacity of germination even in the
presence of favorable environment conditions
either they are non-viable , empty or dormant
• The seed germination capacity can be
determined by performing a germination test
(ISTA – Rules 1985 )
What Is Seed Dormancy
• The growth and development from seed to a
plant
• Seed dormancy means to delay germination
until favorable environment conditions are
present for seed germination
Dormancy
• Dormancy is a mechanism to prevent
germination during unsuitable ecological
conditions , when the probability of seedling
survival is low
• There are two types of dormancy
• Predictive dormancy
• Consequential dormancy
Scarification
- Process of rupturing or weakening the seed coat
- It employes when the dormancy of seed results
due to their resistant or impermeable seed coats.
- mechanically thrashing the seed by machines &
hand
- chemically by treating them with strong mineral
acides.
Temperature
• A large number of plants produce seeds which
germinate under normal temperature
• But some do not germinate if they are stored
at room temperature
• They require chilling treatment for a period of
time
Pressure
- hydrolic pressure of 2000 atm at 18oc for 5-20
min.
- results due to changes in the permeability
of testa
to water.
Light/Dark
• Some seeds need light to germinate , other
need darkness , and light prevents sprouting
• If light is required , sow on the surface. If
darkness is needed cover seed well
Carbon dioxide
• Carbon dioxide reduce the percentage of
germination
• However CO2 high concentration , promotes
germination in Xanthium , Hactuca and
Trifolium
Induction of Dormancy by Chemicals
• Search for substances that induce dormancy in
seed resulted in the discovery of a host of
compounds like coumerin para ascorbic acid ,
hydrogen cyanide , Abscisic acid , etc
Chemical Compounds that break seed
dormancy
• Plants have unique properties in synthesizing
compounds which can induce dormancy as
well as break the dormancy
• Gibberellins
• Cytokinins
• Ethylene
• Chlorohydrins
• Theourea
REFERENCES
-Introductory Plant Physiology
- Noogle and Fritz
-Plant Physiology
-S. N. Pandey and B .K.Sinha
Control and release of dormancy

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Control and release of dormancy

  • 1. Control and Release of Seed Dormancy 1626011
  • 2. Content 1. Introduction 2. What Is Seed Dormancy 3. Dormancy 4. Scarification 5. Temperature 6. Pressure 7. Light/dark 8. Carbon dioxide 9. Induction of Dormancy by Chemicals 10. Chemical Compounds that break seed dormancy
  • 3. Introduction • Sometimes seed are sown that do not have the capacity of germination even in the presence of favorable environment conditions either they are non-viable , empty or dormant • The seed germination capacity can be determined by performing a germination test (ISTA – Rules 1985 )
  • 4. What Is Seed Dormancy • The growth and development from seed to a plant • Seed dormancy means to delay germination until favorable environment conditions are present for seed germination
  • 5. Dormancy • Dormancy is a mechanism to prevent germination during unsuitable ecological conditions , when the probability of seedling survival is low • There are two types of dormancy • Predictive dormancy • Consequential dormancy
  • 6. Scarification - Process of rupturing or weakening the seed coat - It employes when the dormancy of seed results due to their resistant or impermeable seed coats. - mechanically thrashing the seed by machines & hand - chemically by treating them with strong mineral acides.
  • 7. Temperature • A large number of plants produce seeds which germinate under normal temperature • But some do not germinate if they are stored at room temperature • They require chilling treatment for a period of time
  • 8. Pressure - hydrolic pressure of 2000 atm at 18oc for 5-20 min. - results due to changes in the permeability of testa to water.
  • 9. Light/Dark • Some seeds need light to germinate , other need darkness , and light prevents sprouting • If light is required , sow on the surface. If darkness is needed cover seed well
  • 10. Carbon dioxide • Carbon dioxide reduce the percentage of germination • However CO2 high concentration , promotes germination in Xanthium , Hactuca and Trifolium
  • 11. Induction of Dormancy by Chemicals • Search for substances that induce dormancy in seed resulted in the discovery of a host of compounds like coumerin para ascorbic acid , hydrogen cyanide , Abscisic acid , etc
  • 12.
  • 13. Chemical Compounds that break seed dormancy • Plants have unique properties in synthesizing compounds which can induce dormancy as well as break the dormancy • Gibberellins • Cytokinins • Ethylene • Chlorohydrins • Theourea
  • 14. REFERENCES -Introductory Plant Physiology - Noogle and Fritz -Plant Physiology -S. N. Pandey and B .K.Sinha