seed germination process

1. Seed Germination:Emergence of Radicle through Seed Coat
Water Warm Temperature
So if you want to store seeds what are the conditions? Dry Cold
Dormant seeds need more than moisture and warmth:
Thick Seed Coat
Thin Seed Coat
Insufficient Development
Inhibitor: Abscisic Acid
Inhibitor: Phenolics
Scarification
Light
Soil Fungus Association
Stratification > Vernalization
Leaching by Repeated Rain
Kentucky Coffee Tree
Lettuce
Orchids
Most CT feral plants
Cacti
Darkor or Pea
Dormancy is caused by: Is overcome by: Example:
Seeds lacking dormancy need:
nick digest
scrub fire
freeze-thaw cycles
6 weeks at 4° C 20° C

2. Barley Seed Germination
Fruit+Seed Coat
Endosperm
Aleurone Layer
Storage Protein
Amino Acids
hydrolysis
translation
transcription
hydrolysis
starch
sugar
α-amylase
RNA
DNA
GA
imbibition
water
radicle apex
shoot apex
growthcotyledon
monocot
maltose
Embryo
exocytosis

3. Capsella Seed:
Seed Coat
Endosperm
Embryo
Shoot Apex
Cotyledons - dicot
Hypocotyl
Radicle
Root Apex
Micropyle

4. Lettuce Seed Germination
660 nm
730 nm
dark
Seed Coat
translation
transcription
hydrolysis
starch
sugar
α-amylase
RNA
DNA
imbibition
water
radicle apex
shoot apex
growthdicot
photoreversibility
Pfr Pr
photoactivation
Embryo
phytochrome
red and
white light
stimulate
germination
cotyledons