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Effects of 1, 3, 6, 18, 24, and 48 h of HCN treatment (1 mM) of dormant sunflower embryos on the time-course of germination at 10 °C (a) and on the time to obtain 50% germination (T50) (b) (C, non-treated control embryos placed directly on water). Time 0 corresponds to the beginning of the treatment by HCN of seeds imbibed at 10 °C, for various durations, prior to HCN removal. Means of eight replicates ±SD.
