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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.

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Presentation on theme: "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."— Presentation transcript:

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 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 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 -amylase RNA DNA GA imbibition water radicle apex shoot apex growth cotyledon 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 -amylase RNA DNA imbibition water radicle apex shoot apex growth dicot photoreversibility Pfr Pr photoactivation Embryo phytochrome red and white light stimulate germination cotyledons


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