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The stomatal conductance of non-drought and droughted sugar beet plants exposed to changing PPFD. Plants were exposed to a PPFD of 250 µmol m−2 s−1 for 15 min, 2500 µmol m−2 s−1 for 30 min and 250 µmol m−2 s−1 for 30 min, measured using an infrared gas analyser (LI-6800, LI-COR, Lincoln, NE, USA) with measurements logged every minute. These data were used to plot LL.4 curves and estimate stomatal speed. Error bars show SE ±, n = 4 non-droughted and 4 droughted sugar beet.
