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Ascorbate and glutathione levels were investigated in pea leaf discs exposed to various singlet oxygen generating compounds: eosin, rose bengal, monuron, acifluorfen and 5-amino-levulinic acid (ALA). The cellular level of the major antioxidant ascorbate was markedly decreased by the herbicides monuron, acifluorfen and ALA (in light-dependent reactions), as well as by the xanthene dyes eosin and rose...
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