What is FV FM in photosynthesis?
Fv/Fm is a normalized ratio created by dividing variable fluorescence by maximum fluorescence. It is a measurement ratio that represents the maximum potential quantum efficiency of Photosystem II if all capable reaction centers were open.
What is ek in photosynthesis?
The ‘light saturation index’, Ek. The light saturation index is the intercept. between the initial slope of the P versus E curve, a* and P^, and is denoted E^ (= P^/a*). This ratio was introduced in the analysis of photosynthetic responses.
What is qP in photosynthesis?
The coefficient qP is a measure of the ratio between the actual macroscopic quantum yield of photochemistry in PS II (41-1) in a given light state and its maximal value measured when all PS II traps are open (41-2) in that state, with 41-3 and 41-4.
Does photosynthesis have a maximum rate?
The maximum rate of photosynthesis occurs in the red and blue regions of the visible light as seen in the absorption spectra of chlorophyll a and b.
What are the limiting factors of photosynthesis?
Three factors can limit the rate of photosynthesis: light intensity, carbon dioxide concentration and temperature.
- Light intensity. Without enough light, a plant cannot photosynthesise very quickly – even if there is plenty of water and carbon dioxide.
- Carbon dioxide concentration.
- Temperature.
What is FV fluorescence?
Chlorophyll fluorescence parameter Fv/Fm, which is the ratio of variable to maximum fluorescence after dark-adaptation, represents maximum quantum yield of PSII. The parameter has begun to be used for detecting stress in plants.
How is drought stress measured in plants?
A leaf is cut from the plant, the cut end is inserted into a rubber grommet, and the leaf is placed into sealed chamber. 2.) Compressed gas is slowly added to the chamber until water appears at surface of the cut end of the leaf. The pressure recorded is equal to the negative pressure (tension) within the leaf.
How does light intensity affect the rate of photosynthesis graph?
As the light intensity increases the rate of photosynthesis follows (point B on the graph). This means more carbon dioxide is being absorbed by the plant for photosynthesis. So this means more carbon dioxide uptake occurs. The graph shows this increase in carbon dioxide uptake.
What is the absorb maximum of PSII?
One of them has its absorption maximum at about 683 nm and is responsible for the prominent shoulder that is present in the 10 K absorption spectra of most PSII-RC preparations.
What is maximum quantum yield of PSII?
Quenching analysis
| Photochemical quenching parameter: | ||
|---|---|---|
| ΦPSII | Quantum yield of PSII | ( F′m −Ft)/ F′m |
| qP | Proportion of open PSII | ( F′m minus;Ft)/( F′m − F′m ) |
| Fv/Fm | Maximum quantum yield of PSII | (Fm−Fo)/Fm |
| Non‐photochemical quenching parameters: |