Abstract
H 2 O 2 has two faces in plants: it is toxic at low concentrations in the chloroplasts, and it is a necessary cosubstrate for the production of biopolymers in the apoplastic compartment. Plants have evolved an antioxidant system that enables them to cope with high intrinsic production rates of H 2 O 2 . Measurements of H 2 O 2 in air at a rural, forested site were used to calculate the influx of atmospheric H 2 O 2 into spruce needles. The estimated uptake rates were compared with the capacity of protective systems present in the aqueous matrix of the cell wall and inside the cells in the symplastic space. Evidence is presented that the rate of H 2 O 2 detoxification exceeds its uptake up to 10 6 -fold (...)
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