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

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Fig Seedling germination may depend on light

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

Page 1: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.
Page 2: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Action spectrum of photosynthesis

Fig 39.3

Page 3: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Fig 39.12

Seedling germination may depend on light

Page 4: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Phytochrome: a reversible receptor

Fig 39.15

Page 5: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

http://www.mcdb.ucla.edu/Research/Tobin/research.html

Page 6: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Hey, want toswap some

pollen?

Page 7: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

I don’t haveany flowers.

Page 8: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

I guess I willhave to find

another plant.

Page 9: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

I hate whenthat happens.

You give reallygood pollen.

Page 10: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Fig39.13

Plants use day length to synchronize flowering

Page 11: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

The critical period is actually night length

Fig39.13

Page 12: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Phytochrome regulates flowering time

Fig39.14

Page 13: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Plants use night length to determine the season.

Page 14: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

What about daily time... the circadian clock

Page 15: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Circadian Rhythms: daily patterns set by light(northern flying squirrel)

Page 16: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

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://plantsinmotion.bio.indiana.edu/plantmotion/movements/leafmovements/clocks.html
http://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/tropisms.html
Page 17: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

http://www.ou.edu/wanglab/Circadian.html

The molecular identity of the circadian clock is unknown

Page 18: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

CCA1 is a transcription factor that regulates some photosynthetic genes.

http://www.mcdb.ucla.edu/Research/Tobin/research.html

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Page 19: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

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

Page 20: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Plants were created that lack a functional CCA1 gene

http://www.mcdb.ucla.edu/Research/Tobin/research.html

Page 21: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

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

Page 22: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

http://www.mcdb.ucla.edu/Research/Tobin/research.html

Page 23: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

http://www.mcdb.ucla.edu/Research/Tobin/research.html

Page 24: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Plants overexpressing CCA1 had delayed flowering. Furthermore, leaf movement rhythms were abolished

Page 25: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

http://www.ou.edu/wanglab/Circadian.html

CCA1 is part of the oscillator, but it is not THE oscillator/clock.

Page 26: Action spectrum of photosynthesis Fig 39.3 Fig 39.12 Seedling germination may depend on light.

Enjoy your break...


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