action spectrum of photosynthesis fig 39.3 fig 39.12 seedling germination may depend on light
DESCRIPTION
Fig Seedling germination may depend on lightTRANSCRIPT
Action spectrum of photosynthesis
Fig 39.3
Fig 39.12
Seedling germination may depend on light
Phytochrome: a reversible receptor
Fig 39.15
http://www.mcdb.ucla.edu/Research/Tobin/research.html
Hey, want toswap some
pollen?
I don’t haveany flowers.
I guess I willhave to find
another plant.
I hate whenthat happens.
You give reallygood pollen.
Fig39.13
Plants use day length to synchronize flowering
The critical period is actually night length
Fig39.13
Phytochrome regulates flowering time
Fig39.14
Plants use night length to determine the season.
What about daily time... the circadian clock
Circadian Rhythms: daily patterns set by light(northern flying squirrel)
http://plantsinmotion.bio.indiana.edu/plantmotion/movements/leafmovements/clocks.html (oxalis)http://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/tropisms.html (sunflower tracking)
Phytochrome sets the circadian clock
http://www.mcdb.ucla.edu/Research/Tobin/research.html
http://www.ou.edu/wanglab/Circadian.html
The molecular identity of the circadian clock is unknown
CCA1 is a transcription factor that regulates some photosynthetic genes.
http://www.mcdb.ucla.edu/Research/Tobin/research.html
25 28 31 34 37 40 43 46 49 52 55 57
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.html
Plants were created that lack a functional CCA1 gene
http://www.mcdb.ucla.edu/Research/Tobin/research.html
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.html
http://www.mcdb.ucla.edu/Research/Tobin/research.html
http://www.mcdb.ucla.edu/Research/Tobin/research.html
Plants overexpressing CCA1 had delayed flowering. Furthermore, leaf movement rhythms were abolished
http://www.ou.edu/wanglab/Circadian.html
CCA1 is part of the oscillator, but it is not THE oscillator/clock.
Enjoy your break...