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Photooxidative stress in leaf discs (WT and pdx1). A) Autoluminescence of leaf discs exposed for 6 h to 1500 μmol m-2 s-1 at 10°C. B) Thermoluminescence band at high temperature (ca. 135°C) in leaf discs exposed to high light stress for 0, 5, 6 or 20 h. The thermoluminescence signal of discs taken from leaves of the pdx1 mutant and preinfiltrated with vitamin B6 (2 mM) is also shown (5 h + vitamin B6).
