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Light response changes in Y(NPQ) (A), NPQ (B) and Y(ND) (C) for leaves from sun- and shade-grown tobacco plants measured at 24°C and 400 μmol mol-1 CO2 concentration. Values are means ± SE (n = 6). Values are means ± SE (n = 6). Significant differences between the sun and shade leaves were examined (T-test, P < 0.05). Asterisks indicate significant differences in the sun leaves compared to the shade leaves.
