2. Action spectrum of photosynthesis Fig 39.3

3. Fig 39.12 Seedling germination may depend on light

4. Phytochrome: a reversible receptor Fig 39.15

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

6. Hey, want to swap some pollen?

7. I don’t have any flowers.

8. I guess I will have to find another plant.

9. I hate when that happens. You give really good pollen.

10. Fig 39.13 Plants use day length to synchronize flowering

11. The critical period is actually night length Fig 39.13

12. Phytochrome regulates flowering time Fig 39.14

13. Plants use night length to determine the season.

14. What about daily time... the circadian clock

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

16. http://plantsinmotion.bio.indiana.edu/plantmotion/movements/leafmovements/clocks.htmlhttp://plantsinmotion.bio.indiana.edu/plantmotion/movements/leafmovements/clocks.html (oxalis) http://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/tropisms.htmlhttp://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

17. http://www.ou.edu/wanglab/Circadian.html The molecular identity of the circadian clock is unknown

18. 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

19. 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

20. Plants were created that lack a functional CCA1 gene http://www.mcdb.u cla.edu/Research/T obin/research.html

21. With no CCA1 protein, phytochrome induction of Lhcb RNA is reduced to 60% of the normal level. http://www.mcdb.ucl a.edu/Research/Tobin /research.html

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

25. http://www.ou.edu/wanglab/Circadian.html CCA1 is part of the oscillator, but it is not THE oscillator/clock.

26. Enjoy your break...