Plant-derived smoke and aqueous extracts of smoke can overcome certain types of seed dormancy . Successful smoke (aqueous) pre-treatment of seed of the fire-climax grass Themeda triandra Forssk . is reported . The promotive effect of smoke on seed germination was retained when pre-treated seed was dried and stored for up to 21 days . Seed pre-treatment with smoke had no detrimental effect on subsequent seedling growth .
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