Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

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.ou.edu/wanglab/Circadian.html

The molecular identity of the circadian clock is unknown

CCA1 is a transcription factor that regulates some photosynthetic genes.

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.

Plants were created that lack a functional CCA1 gene

With no CCA1 protein, phytochrome induction of Lhcb RNA is reduced to 60% of the normal level.

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...

Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

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Transcript of Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

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