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Seed Dormancy - Coggle Diagram
Seed Dormancy
Exogenous
Chemical
Occur in fleshy fruit such as apple
Common compound
Phenolics compound
Flavanoid
Tannin
Chemical from seed coat/ embryo
Breaking mechanism
Leaching
Removal certain part of seed
Physical
Involve imbibition of water
One or more layer of palisade cell in seed testa
Hard seed coat
Common compound
Lignin
Cutin
Callose
Phenolics
Breaking mechanism
Mechanical scarification
Chemical scarification
Mechanical
Germination does not occur until seed coat is soften
Breaking mechansm
Warm stratification
Cold stratification
Scarification (mechanical & chemical)
Mechanical restraint to embryo expansion or radicle intrusion
Endogenous
Physiological
Divided into three types
Non deep
Intermediate
Deep
Breaking mechanism
Stratification (warm & cold)
Chemical treatment
Most occuring types of dormancy
Morphological
Seed embryo not fully develop after seed dissemination
Breaking mechanism
Chemical treatment (GA) - Anemone coronaria
Cold stratification - Aristolochia macrophylla
Warm stratification – Elaeis guineensis.
Morphophysiological
Have both morphological dormancy and physiological dormancy