the bright side of life: photomorphogenesis. cells and cell growth membranes and cell walls...
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![Page 1: The bright side of life: Photomorphogenesis. Cells and cell growth Membranes and cell walls Fertilization and embryogenesis Seed development and dormancy](https://reader038.vdocuments.net/reader038/viewer/2022110207/56649d7e5503460f94a61487/html5/thumbnails/1.jpg)
The bright side of life:
Photomorphogenesis
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Cells and cell growthMembranes and cell walls Fertilization and
embryogenesis
Seed development and dormancy
Germination
Water transport
Water relations
Plant nutrition
Solute transport
Gene function
SkotomorphogenesisPhotomorphogenesis
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Three learning goals:
- what is a photomorphogenesisplant development with lightrequirements:
light regulated developmenttranscription factors that respond to light signals
- photoreceptors and their integration in developmenthow plants “see” light and what happens thenrequirements:
photoreceptor molecules that are sensitive at appropriate wavelengths
- photomorphogenesis during seedling developmentrequirements:
signal transduction apparatus that connects light responses and seedling development
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What is not regulated by light ???
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SKOTOMORPHOGENESIS
Photomorphogenesis Skotomorphogenesis
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Sunflower seedling development in dark and light
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SKOTOMORPHOGENESIS
Skotomorphogenesis
Light has an influence on seedling development
Skotomorphogenesis Photomorphogenesis Hypocotyl: long short
Apical hook: closed open
Cotyledons: closed expanded
Chloroplasts: proplastids fully developed
Photosynthesis: no yes
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Cotyledon expansion
Reduced hypocotylelongation
Open apical hook
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closed apical hook Non-expanded
cotyledons
Etiolated hypocotyl
Is skotomorphogenesis achived via active repression of photomorphogenesis
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How to perform genetic approaches todecifer light regulation in plants ???
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How to perform genetic approaches todecifer light regulation in plants ???
Photomorphogenesisin dark grown seedlings
Skotomorphogenesis in light grown seedlings
Asking simple questions
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Getting complicated answers !!
Shorthypocotyl
Expanded cotyledons
Open apical hook
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Skotomorphogenesis in the light
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Dark
Light
wild-type
cop/detmutants
COP and DET proteins inhibit photomorphogenesis
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Regulation of skotomorphogenesis by GA
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Germination in dark and light
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Gene activation through photoreceptors and PIF proteins
Hemara
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Photomorphogenesis via protein regulation (protein stability and turnover)
day
night