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Effects of NO (5 mM) and KAR1 (3 × 10− 9 M) on (a) H2O2, b O2-• in secondary dormant Brassica oleracea seeds during imbibition at 21 °C (n = 3). Values are mean ± SE. Significant differences between treatments determined by two-way analysis of variance (ANOVA), followed by HSD Tukey’s test. Means with different letters are significantly different at p < 0.05. KAR1, karrikin1; NO, Nitric oxide; H2O2, hydrogen peroxide; O2•- Superoxide anion, h, hours
