About Lesson
Requirements for Germination
- Oxygen is most critical, required for respiration
- High levels of CO2 inhibitory
- Nitrogen no effect
Pattern of Germination
- “Trigger agent” – a factor that elicits germination but whose presence is not required throughout (e.g., light, temperature); shifts the balance from inhibitor to the promoter
- “Germination agent” – a factor that must be present throughout germination (GA3)
The sequence of events for germination
Ø Radicle protrusion is the final sequence of germination
Ø Seedling becomes autotrophic
Ø Germination is ended by visible primary root growth
