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Response of net CO2 uptake per unit area to PPFD (A) and actual net CO2 uptake per unit area (B) in leaves of different strata of potato plants of the WT or expressing the Arabidopsis PHYB transgene (Dara-5 and Dara-12). Plant density was 10 (A) or 20 (B) plants m-2. Data are means and se of four replicates.
