The effect of external CO2 concentration on the expression of carbonicanhydrase (CA) and ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco)was examined in pea (Pisum sativum cv Little Marvel) leaves. Enzymeactivities and their transcript levels were reduced in plants grown at 1000μL/L CO2 compared with plants grown in ambient air. Growth at 160 μL/LCO2 also appeared to reduce steady-state transcript levels for rbcS, thegene encoding the small subunit of Rubisco, and for ca, the gene encoding CA;however, rbcS transcripts were reduced to a greater extent at thisconcentration. Rubisco activity was slightly lower in plants grown at 160μL/L CO2, and CA activity was significantly higher than that observed inair-grown plants. Transfer of plants from 1000 μL/L to air levels of CO2resulted in a rapid increase in both ca and rbcS transcript abundance infully expanded leaves, followed by an increase in enzyme activity. Plantstransferred from air to high-CO2 concentrations appeared to modulatetranscript abundance and enzyme activity less quickly. Foliar carbohydratelevels were also examined in plants grown continuously at high and ambientCO2, and following changes in growth conditions that rapidly altered ca andrbcS transcript abundance and enzyme activities.
Majeau, N., & Coleman, J. R. (1996). Effect of CO2 concentration on carbonic anhydrase and ribulose-1,5-bisphosphate carboxylase/oxygenase expression in pea. Plant Physiology, 112(2), 569–574. https://doi.org/10.1104/pp.112.2.569