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The effects of graphene on the germination and growth of rice,rape,tobacoo and tomato seeds were studied.Seeds were treated with graphene solutions at different concentrations.Obvious delaying effects on the germination rate were observed with the increasing of graphene concentration.To better understand the effects of nanomaterials on plants,tobacco seedlings and graphene oxide were used as research materials for detailed study.The tobacco seedlings were treated with 0 mg/L and 20 mg/L of graphene oxide.Results indicated that 20 mg/L of graphene oxide had a significant effect on the tobacco roots growth.Treatment with 20 mg/L of graphene oxide resulted into shorter seminal root length than control samples after 20 days treatment.