Figure 7.
Effects of transfer to elevated CO2 on the diurnal accumulation of nonstructural leaf carbohydrates: A, Glc; B, Fru; C, Suc; and D, starch. Ambient-CO2-grown plants were transferred to elevated CO2 at the beginning of d 1, and plants were collected through the 24-h period on d 6 of exposure. Values represent means ± sd from three extractions. Starch is expressed as micromoles of Glc equivalents. Total maximum sugar amounts were 55.7 and 108.1 μmol hexose equivalents g−1 fresh weight in ambient-CO2-grown and high-CO2-transferred plants, respectively. Filled symbols, Ambient-CO2-grown plants; open symbols, high-CO2-treated plants. FW, Fresh weight.