Action spectrum of photosynthesis

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Action spectrum of photosynthesis
Fig 39.3
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Fig 39.12
Seedling germination may depend on light
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Fig 39.15
Phytochrome a reversible receptor
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http//www.mcdb.ucla.edu/Research/Tobin/research.h
tml
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Hey, want toswap somepollen?
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I dont haveany flowers.
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I guess I willhave to findanother plant.
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I hate whenthat happens.
You give reallygood pollen.
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Plants use day length to synchronize flowering
Fig39.13
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The critical period is actually night length
Fig39.13
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Phytochrome regulates flowering time
Fig39.14
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Plants use night length to determine the season.
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What about daily time... the circadian clock
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Circadian Rhythms daily patterns set by
light (northern flying squirrel)
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Phytochrome sets the circadian clock
http//www.mcdb.ucla.edu/Research/Tobin/research.h
tml
http//plantsinmotion.bio.indiana.edu/plantmotion/
movements/leafmovements/clocks.html
(oxalis) http//plantsinmotion.bio.indiana.edu/pla
ntmotion/movements/tropism/tropisms.html
(sunflower tracking)
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The molecular identity of the circadian clock is
unknown
http//www.ou.edu/wanglab/Circadian.html
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CCA1 is a transcription factor that regulates
some photosynthetic genes.
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http//www.mcdb.ucla.edu/Research/Tobin/research.h
tml
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Overexpression of CCA1 in transgenic Arabidopsis
plants abolished the circadian rhythms of several
genes with dramatically different phases.
http//www.mcdb.ucla.edu/Research/Tobin/research.h
tml
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Plants were created that lack a functional CCA1
gene
http//www.mcdb.ucla.edu/Research/Tobin/research.h
tml
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With no CCA1 protein, phytochrome induction of
Lhcb RNA is reduced to 60 of the normal level.
http//www.mcdb.ucla.edu/Research/Tobin/research.h
tml
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http//www.mcdb.ucla.edu/Research/Tobin/research.h
tml
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http//www.mcdb.ucla.edu/Research/Tobin/research.h
tml
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Plants overexpressing CCA1 had delayed flowering.
Furthermore, leaf movement rhythms were abolished
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CCA1 is part of the oscillator, but it is not THE
oscillator/clock.
http//www.ou.edu/wanglab/Circadian.html
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Enjoy your break...