Transcript Seed Germination - Home Page for Ross Koning

Seed Germination: Emergence of Radicle through Seed Coat
Seeds lacking dormancy need: Water Warm Temperature
So if you want to store seeds what are the conditions?
Dry Cold
Dormant seeds need more than moisture and warmth:
Dormancy is caused by:
Thick Seed Coat
Thin Seed Coat
Insufficient Development
Inhibitor: Abscisic Acid
Is overcome by:
Scarification
Light
or
nick digest
scrub fire
freeze-thaw cycles
Dark
Kentucky Coffee Tree
Lettuce
or
Pea
Soil Fungus Association
Orchids
Stratification > Vernalization
Most CT feral plants
6 weeks at 4° C
Inhibitor: Phenolics
Example:
20° C
Leaching by Repeated Rain
Cacti
Barley Seed Germination
Fruit+Seed Coat
Endosperm
starch
maltose
sugar
cotyledon
exocytosis
-amylase
monocot
Aleurone Layer
Storage Protein
RNA
shoot apex
Embryo
GA
radicle apex
water
imbibition
DNA
Amino Acids
Capsella Seed:
Seed Coat
Endosperm
Embryo
Shoot Apex
Cotyledons - dicot
Hypocotyl
Radicle
Root Apex
Micropyle
Lettuce Seed Germination
shoot apex
starch
Seed Coat
sugar
cotyledons
-amylase
dicot
RNA
Embryo
DNA
phytochrome
radicle apex
photoactivation
water
imbibition
photoreversibility
660 nm
Pfr
Pr
730 nm
dark
red and
white light
stimulate
germination