Bonus #2 is due F 3/21

CB 48.25

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

Action spectrum of photosynthesis

CB 10.9

CB 39.18

Seedling germination may depend on light

Phytochrome: a reversible receptor

CB 39.20

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

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

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.

CB 39.22

Plants use day length to synchronize flowering

CB 39.22

The critical period is actually night length

CB 39.23

Phytochrome regulates flowering time

CB 39.24

Hormonal regulation of flowering time

Exposed to flower inducing photoperiod

NOT exposed to flower inducing

photoperiod

CB 36.13

Water moves from the ground through roots into the shoot and out stomata in the leaves.

CB 39.28

What happened to this root?

•Bonus #2 is due F 3/21•For W Fraken-plants (CB concept 38.4)