140
Notes: When using the blue modulated light it was found that the average absorption
value should be set to 0.94 instead of 0.84 as is used by the red modulated light.
By plotting ETR vs. PAR, potential ETR rates, photosynthetic capacity, and ETR rate
limitations, can be determined at given light intensities. (U. Schreiber 2004). Note: Four
electrons must be transported for every CO
2
molecule assimilated or O
2
molecule
evolved.
It has been found that Rapid Light Curves are a better solution in a variable light
environment. Light saturation rate, as measured by rapid light curves, highly correlates
with the concentration and maximum activity of Rubisco (Macintyre 1997), (Macintyre
1996). Measured Steady state photosynthetic rates overestimate actual photosynthetic
rates in a variable light environment (Macintyre 1997).
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