[Objective] The paper was to study the effect of potato extract on its phenolic metabolism,SAGs accumulation and allelopathic autotoxicity.[Method] With water treatment as control,the effects of aqueous extracts of potato bud,leaf-stem and tuber on its morphological characteristics,phenolic metabolism,glycoside alkaloids accumulation and allelopathic autotoxicity were studied.[Result] After the treatment of aqueous extract,the germination rate of potato reduced,germination was delayed,the plants became smaller,and the growth of root slowed down;the content of phenolic substances in roots,stems and leaves of potato increased,glycoside alkaloids accumulated,the activity of PPO and PAL increased.The effects of aqueous extract treatment on germination,growth,phenolic metabolism,glycoside alkaloid content and allelopathic autotoxicity successively were bud extractleaf-stem extracttuber extractcontrol.Treatment of aqueous extract did not affect the distribution of phenolic substances and glycosidic alkaloid in potato.[Conclusion] Phenolic substances and glycosidic alkaloid involved in the allelopathic autotoxicity of aqueous extract of potato,which had inhibition effect on germination and growth of potato.
