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Re: [APD] Effects of CO2 Concentration and Light Intensity on Photosynthesis

Liz Wilhite wrote:
> The measurement being referenced is the concentration of CO2 in the N2
> gas stream, not the concentration of CO2 dissolved in water.  The
> abstract makes no reference to the concentration of CO2i n water. 
> Since most of us don't deliver CO2 by means of an N2 gas stream these
> results have little if any meaning for us.

Ya. I had read that, but had inferred from the later verbiage to 
indicate CO2 levels as experienced by the plant.

"The net photosynthetic rate increased with increasing CO2 levels from 
0.3 to 3.0 mmol mol-1 showing the maximum value, 75 nmolO2 gDW-1 s-1, at 
2-3 mmol mol-1 CO2 and gradually decreased with increasing CO2 levels 
from 3.0 to 10 mmol mol-1."

I will have to see if I can get a copy of this particular paper and see 
what the deal is. 3 ppm did seem quite low.

Jerry Baker
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