Fig. 6. Treatment with H₂O₂ leads to an increase in DNA fragmentation in the cells of stolon tips. (A) There is an increase in DNA fragmentation in cells of peroxide-treated stolon tips. Mean ± s.e.m. luminance (grayscale from 0 to 4095) of FITC-labeled dUTP for three stolon tips per replicate colony (filled bars, control; unfilled bars, 5 mmol l^–1 H₂O₂). (B) There is no significant difference between treatments in cells labeled with PI in stolon tips. Mean ± s.e.m. luminance (grayscale from 0 to 4095) of PI-labeled cells for three stolon tips per replicate colony (filled bars, control; unfilled bars, 5 mmol l^–1 H₂O₂).