1. Skotomorphogenesis Plant life cycle Seed germination Embryo and
Seed development
Genes and enzymes
Skotomorphogenesis
Plant life cycle

2. SKOTOMORPHOGENESIS
Photomorphogenesis
Skotomorphogenesis

3. SKOTOMORPHOGENESIS Skotomorphogenesis
Light has an influence on seedling development
Photomorphogenesis Skotomorphogenesis
 Hypocotyl: long short
 Apical hook: closed open
 Cotyledons: closed expanded
Chloroplasts: proplastids fully developed
Photosynthesis: no yes
Skotomorphogenesis

6. Open apical
hook
Cotyledon
expansion
Reduced hypocotyl
elongation

7. closed apical
hook
Non-expanded
cotyledons
Etiolated
hypocotyl
Is skotomorphogenesis achived via active repression of photomorphogenesis

8. How to perform genetic approaches to
decifer light regulation in plants ???

9. Asking simple questions !!
Photomorphogenesis
in dark grown seedlings
Skotomorphogenesis
in light grown seedlings
Asking simple questions !!
How to perform genetic approaches to
decifer light regulation in plants ???

10. Getting complicated answers !!
Open apical hook
Expanded
cotyledons
Short
hypocotyl

11. Skotomorphogenesis in the light

12. Dark Light COP and DET proteins inhibit photomorphogenesis
cop/det mutants
wild-type
Dark
Light

15. Regulation of skotomorphogenesis by GA

17. Germination in dark and light