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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 Dark or 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

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Page 1: Seed Germination: Emergence of Radicle through Seed Coat WaterWarm Temperature So if you want to store seeds what are the conditions?Dry Cold Dormant seeds

Seed Germination:

Emergence of Radicle through Seed Coat

Water Warm TemperatureSo 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 digestscrub firefreeze-thaw cycles

6 weeks at 4° C

20° C

Page 2: Seed Germination: Emergence of Radicle through Seed Coat WaterWarm Temperature So if you want to store seeds what are the conditions?Dry Cold Dormant seeds

Barley Seed Germination

Fruit+Seed Coat

Endosperm

Aleurone LayerStorage Protein

Amino Acids

hydrolys

is

translat

ion

transcri

ption

hydrolys

is

starch

sugar

-amylase

RNA

DNA GA

imbibition

water

radicle apex

shoot apex

growth

cotyledon monocot

maltose

Embryo

exocytosis

Page 3: Seed Germination: Emergence of Radicle through Seed Coat WaterWarm Temperature So if you want to store seeds what are the conditions?Dry Cold Dormant seeds

Capsella Seed:

Seed Coat

Endosperm

Embryo

Shoot Apex

Cotyledons - dicotHypocotyl

Radicle

Root Apex

Micropyle

Page 4: Seed Germination: Emergence of Radicle through Seed Coat WaterWarm Temperature So if you want to store seeds what are the conditions?Dry Cold Dormant seeds

Lettuce Seed Germination

660 nm

730 nmdark

Seed Coat

translat

ion

transcri

ption

hydrolys

is

starch

sugar

-amylase

RNA

DNA

imbibition

water

radicle apex

shoot apex

growth

dicot

photoreversibility Pfr Pr

photoactivation

Embryo

phytochromered and white light stimulate germination

cotyledons


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