we are interested in lowering the the process of photo respiration via plant genetic engineering.Accordingly , we would like the effects of increasing CO2 levels.
Out of my field, but there are natural CO2 sources and it is beyond imagining that nobody has looked at local plant communities
In geothermal settings where crustal and/or mantle derived CO2 concentrations are very high (>20,000 ppm), d13C-CO2 signatures in plant material shows a significant shift. I'd suggest looking into this subject area.
please check the following link;
http://www.co2science.org/subject/b/summaries/biodivc3vsc4.php
https://naldc.nal.usda.gov/download/40588/PDF
The increasing atmospheric CO2 lead to increasing relative a abundance in C3 plant
because ROBISCO in c3 is the first enzyme which accepts the CO2, but the C4 did not response the increasing CO2 because the first enzyme accepts co2 is PEP
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