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Nicotiana tabacum seed germination under various continuous white-light regimes with and without treatments. (a) TR (3 days imbibition) and (b) ER (5 days imbibition) percentage of dormant N. tabacum in relationship to light availability plotted on a logarithmic x axis. There were 4 treatment groups; Air GPAW, He/O2 GPAW, Nitrate (5 mM KNO3−) and H2O2 (300 µM); control seeds were imbibed in water.
