Marcal, D.M.S., Avila, R.T., Quiroga-Rojas, L.F., de Souza, R.P.B., Gomes Junior, C.C., Ponte, L.R., Barbosa, M.L., Oliveira, L.A., Martins, S.C.V., Ramalho, J.D.C. and DaMatta, F.M.
2021
Elevated [CO2] benefits coffee growth and photosynthetic performance regardless of light availability.
Plant Physiology and Biochemistry 158: 524-535.
" ... "The combined effects of elevated CO2 and light availability have been seldom investigated in crop species."
Whether grown under low light or higher light conditions coffee plants will benefit from the ongoing rise in atmospheric CO2.
Out of the 44 variables examined related to photosynthesis, growth, nitrogen and pigment, and metabolites, Marcal et al. report that 39 were significantly affected by light, CO2 or their interaction.
In particular, they note that "variations associated with growth and biomass traits were mostly explained by the factor [of] light, whereas variations linked to photosynthetic traits were mostly explained by the factor [of] CO2.
... elevated CO2 stimulated net photosynthesis by +48% under low light conditions and a much greater +72% under high light conditions.
Similarly, elevated CO2 led to biomass increases of +37% and +32% in the low and high light treatments, respectively.
... Coffee seedlings were subjected to one of two CO2 concentrations (ambient or elevated, corresponding to 380 or 740 ppm, with the elevated CO2 being supplied between the hours 0600 and 1800 daily) and one of two light levels (low or high, corresponding to approximately 7.5 and 16 mol photons m-2 d-1 ... "