Profile of chilling-induced H
accumulation in leaves of Nipponbare seedlings at the V
stage. H2O2 level was measured at 30 minutes interval in chilling stressed (10°C) and control (28°C) seedlings. Values represent the ratio of the concentrations in chilling stressed and control plants at each time point ([nmole chilling]/[nmole control]). Peak values at 1.5, 4, 5 and 8.5 hours were significantly greater than 1 at p < 0.01, n = 3 (SE shown as error bars).