T8L6b Flashcards
1
Q
which version of phytochrome is active
A
Pfr
2
Q
wavelength of pr
A
660nm
3
Q
wavelength of pfr
A
730nm
4
Q
Describe the cycle of Pr to Pfr and back
A
Pr absorbs red light (in sunlight) and is converted into Pfr.
Pfr absorbs far red light and in the presence of this/darkness is converted into Pr
5
Q
Interaction between phytochromes and TFs
A
Phytochromes r,fr can activate or deactivate TFs which causes/prevents transcription to occur and genes to be expressed. This is how phytochromes determine whether a plant flowers or not
6
Q
What is photoperiodism
A
The growth and development of plants in response to for what period they are exposed to light
7
Q
How does photoperiodism work
A
Plants only flower when exposed to the right levels of light
8
Q
A
