"Prior studies have shown that high CO2 levels can often ameliorate growth and dry mass declines caused by low (or excessively high) light intensity under field or laboratory conditions by increasing the net photosynthetic rate.
... Huber, B.M.,
Louws, F.J. and
Hernández, R.
2021
Impact of different daily light integrals and carbon dioxide concentrations on the growth, morphology, and production efficiency of tomato seedlings.
Frontiers in Plant Science 12: 615853, doi: 10.3389/fpls.2021.615853.
"Three CO2 and three light intensity treatments were applied ...
For CO2, concentrations included 448 ppm (ambient), 1010 ppm (elevated) and 1568 ppm (super elevated), which concentrations were applied during lighted hours only (during the dark period the chambers were all ventilated to return the CO2 level to ~400 ppm).
For light intensity, three levels with an 18-hour photo period were applied with photosynthetic photon flux densities of 100, 150 and 200 µmol per square meter per second ...
... Net photosynthesis, fresh mass and dry mass ... rose by an average 66%, 16% and 53%, respectively, under all CO2 treatments when the DLI increased from 6.5 to 13 mol per square meter per day.
Similarly under all DLI treatments when the CO2 concentration rose from 448 to 1568 ppm net photosynthesis, fresh mass and dry mass increased by an average 52%, 20% and 33%, again respectively.
And when combined, the simultaneous rise in DLI and CO2 increased these three parameters by a whopping
165% (net photosynthesis),
36% (fresh mass) and ...
165% (dry mass).
... elevated CO2 ... does counter the growth-retarding effects of low light levels.
The results presented above demonstrate several of the many wonders of atmospheric CO2 enrichment that are benefiting plants as the air’s CO2 concentration rises." ...
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Thursday, April 29, 2021
Huber et al. (2021) --"Elevated CO2 improves tomato growth under low light conditions"
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