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of 370 μmol·mol −1 and then to estimate the net assimilation rate at this C i . The gas-phase resistance for CO 2 assimilation, consisting of the boundary layer and stomatal resistance, was calculated as (CO 2,air − C i )/ A n . Mesophyll

carboxylation efficiency were obtained from analysis of so-called “A-C i curves” [i.e., response curves of net assimilation rate versus leaf internal CO 2 concentration, where A = P n ( Farquhar and Sharkey, 1982 )]. Complete A-C i curves were obtained for a

supplemental CO 2 . Morison and Gifford (1983) reported that the stomatal conductance ( g S ) of plants decreases under elevated CO 2 , whereas the internal concentration of CO 2 increases and net assimilation rate is either unaffected or increased ( Mott

(from day 4 to day 30 or 33), and at a 50% higher DLI, which could cause different responses. The relative growth rate of a plant is a function of its leaf area ratio and the net assimilation rate ( Lambers et al., 2008 ). The leaf area ratio indicates