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Published byJohn Davies Modified over 10 years ago
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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: Is overcome by: Example: nick digest scrub fire freeze-thaw cycles Thick Seed Coat Scarification Kentucky Coffee Tree or Thin Seed Coat Light Dark Lettuce Pea Insufficient Development Soil Fungus Association Orchids Inhibitor: Abscisic Acid Stratification > Vernalization Most CT feral plants 6 weeks at 4° C 20° C Inhibitor: Phenolics Leaching by Repeated Rain Cacti
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Barley Seed Germination
hydrolysis starch Fruit+Seed Coat maltose Endosperm sugar exocytosis Aleurone Layer cotyledon -amylase translation Storage Protein monocot hydrolysis shoot apex RNA growth transcription Embryo Amino Acids DNA GA water radicle apex imbibition
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Capsella Seed: Embryo Seed Coat Shoot Apex Endosperm Cotyledons - dicot Hypocotyl Radicle Root Apex Micropyle
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Lettuce Seed Germination
shoot apex hydrolysis starch Seed Coat sugar cotyledons -amylase translation dicot growth RNA transcription Embryo DNA photoactivation phytochrome radicle apex photoreversibility red and white light stimulate germination water 660 nm Pfr Pr dark 730 nm imbibition
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