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In Salix nigra seeds, the effect of light intensity on membrane permeability, was measured by both ESR spin probe and conductivity. Seeds were aged at 25 °C for 3 d at two different light intensities (1·75 and 16·1 µmol m−2 s−1). (A) ESR spectra of the spin-probe TEMPONE; (B) comparison chart between ESR and conductivity. Values correspond to means ± s.d.
