The influence of carbon dioxide on the growth, pigment, protein, carbohydrate, and mineral status of lettuce

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Abstract
Lettuce plants (Lactuca sativa L. cv. Grand Rapids) were grown in nutrient solution in controlled environment plant growth chambers to characterize certain qualitative responses to above ambient levels of CO2. Increased plant material produced under high CO2 levels did not differ nutritionally from plants grown under ambient levels. No differences were found in chloroplast pigment content, protein content, or in carbohydrate content on a weight basis. Sequential harvests did reveal, however, that there is a greater accumulation of carbohydrate, under high CO2 conditions, prior to an increased growth rate as the plants reach maturity.