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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

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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

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

25 28 31 34 37 40 43 46 49 52 55 57

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...