Sunflower plants grown under elevated CO2 concentrations
exhibited lower total chlorophyll (a + b) and carotenoid contents
than plants grown under ambient CO2. Pigment contents decreased
with leaf development in both treatments, but especially at ele-
vatedCO2 concentrations. Thus,the greatestdecrease was observed
between 22 and 32 days, with a loss of chlorophyll of 48% in