Photoperiodism Flashcards
0
Q
What happens in daylight?
A
P660 is converted quickly to P730 as sunlight contains more red light.
1
Q
What are the two forms of light sensitive pigment in plants?
A
Phytochromes
PR (P660)
PFR (P730)
2
Q
What happens in darkness?
A
P730 is converted slowly to P660 due to the low energy far red light.
3
Q
Why is 730nm lower energy than 669nm?
A
Longer wavelength, lower freq, lower energy
4
Q
What induces long day plants to flower?
A
High conc of P730 after short nights
When dark periods are shorter than critical length.
5
Q
What triggers short day plants to flower?
A
High conc of P660 after long periods of uninterrupted darkness. When dark periods are longer than critical length.
6
Q
Example of long day plant?
A
Poppy
7
Q
Examples of day neutral plant?
A
Tomato, dandelion
