Skotomorphogenesis Plant life cycle Seed germination Embryo and

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Presentation transcript:

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

SKOTOMORPHOGENESIS Photomorphogenesis Skotomorphogenesis

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

Open apical hook Cotyledon expansion Reduced hypocotyl elongation

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

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

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 ???

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

Skotomorphogenesis in the light

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

Regulation of skotomorphogenesis by GA

Germination in dark and light

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