ambient atmospheric CO2 conditions. The most marked decrease
was observed between 22 and 32 days, with 48% chlorophyll loss
in plants grown at elevated CO2 concentration compared to 26%
chlorophyll loss in control plants (Fig. 2C). Likewise, carotenoid
content decreased by 25% in plants grown at high CO2 concentra-
tions, but only by 20% in those grown under ambient atmospheric
CO2 conditions (Fig. 2D).