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Timothy L. Righetti, Carmo Vasconcelos, David R. Sandrock, Samuel Ortega-Farias, Yerko Moreno, and Francisco J. Meza

then calculated on a leaf-area basis. These net assimilation rates are obtained by dividing the amount of CO 2 assimilated by the area of the leaf within the chamber or sampling cuvette. Chamber size and analytical approach vary in experiments

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Marlene Ayala and Gregory Lang

-labeling. Net assimilation rate (A) varied between 15.7 and 20.4 μmol·m −2 ·s −1 CO 2 among the three leaf populations and dates. Sampling and 13 C analysis. Immediately after labeling, three fully expanded leaves were sampled from each leaf type to estimate

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Samuel Doty, Ryan W. Dickson, and Michael Evans

(1997) found that salvia ( Salvia sp.) seedlings grown in trays with 7.3-cm 3 root volumes suffered from root restriction and had decreased net assimilation rates compared with trays with 55-, 166-, and 510-cm 3 root volumes. Latimer (1991) also

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Lloyd L. Nackley, Jig Han Jeong, Lorence R. Oki, and Soo-Hyung Kim

conditions ( Table 1 ), after more than 5 months of CO 2 enrichment the plants grown in the elevated CO 2 chambers had consistently greater net assimilation rates across all N treatments ( Table 1 ). However, decomposition of the A - C i curves showed

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Francesco Rossini, Roberto Ruggeri, Tiziano Celli, Francesco Maria Rogai, Ljiljana Kuzmanović, and Michael D. Richardson

ascribed to leaf expansion that compensates for a reduced net assimilation rate, thus resulting in an increased photosynthetic capacity per plant ( Adams and Langton, 2005 ; Solhaug, 1991 ). Moreover, even though leaves and tillers of different cool

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Oscar Monje, Sylvia Anderson, and Gary W. Stutte

·mol −1 to shorten the time for sampling. The responses of net assimilation rate and g S to CO 2 concentration saturate at 1000 μmol·mol −1 and are not significantly different from rates measured at 800 μmol·mol −1 (data not shown). The LI-COR leaf

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Letizia Tozzini, Paolo Sabbatini, and G. Stanley Howell

/F m in the N-sprayed leaves was observed. Photochemical efficiency and chlorophyll content in these leaves were otherwise unchanged by either factor after veraison. Table 4. Net assimilation rate (P n ) measured at midday (1100 hr to 1300 hr ), 8

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Oliver Körner, Jesper Mazanti Aaslyng, Andrea Utoft Andreassen, and Niels Holst

(j), leaf net assimilation rate (P nl , μmol·m −2 ·s −1 ), and atmospheric pressure (θ, Pa) as proposed for potted roses ( Ball et al., 1987 ; Kim and Lieth, 2003 ); k is the conversion factor from [m 2 ·s·mol −1 ] to [s·m −1 ] with 0.025 ( Jones

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Francesco Montesano and Marc W. van Iersel

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

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Hardeep Singh, Megha R. Poudel, Bruce Dunn, Charles Fontanier, and Gopal Kakani

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