Presentation is loading. Please wait.

Presentation is loading. Please wait.

Seed Germination: Emergence of Radicle through Seed Coat

Similar presentations


Presentation on theme: "Seed Germination: Emergence of Radicle through Seed Coat"— Presentation transcript:

1 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

2 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

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

4 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


Download ppt "Seed Germination: Emergence of Radicle through Seed Coat"

Similar presentations


Ads by Google