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P5C induces Pro-like damages in Arabidopsis. A, Reduction of chlorophyll fluorescence of P5C-treated Pat(B33)-Gus plant (1 mm for 9 h) and B, P5C-untreated Pat(B33)-Gus plant. Plants treated for 3 d with 1 mm P5C showed brown dead tissue (C), whereas after treatment with 100 mm Pro only minor damage appeared (D). The yellow color in C derives from 2,4-dinitrophenylhydrazine hydrochloride double salt of P5C.
