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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

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

). Moreover, growth traits, including relative growth rate (RGR), net assimilation rate (NAR), and leaf area ratio (LAR), are greatly dependent on the efficiency with which intercepted radiation is transformed into DW ( Dapoigny et al., 2000 ). Nutrient

(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