As gasotransmitter, nitric oxide (NO) and hydrogen sulfide (HS) are involved in the regulation of plant tolerance to abiotic stresses. Aluminum (Al) toxicity triggers synthesis of NO and HS and seriously affects plant growth and productivity. Exogenous NO and HS alleviate Al toxicity in plants. However, the physiological and molecular mechanisms of NO and HS in alleviating Al toxicity are very scattered. In this review, the advances in the effects of Al on the content of endogenous NO and HS and the mechanisms of exogenous NO and HS in alleviating Al toxicity in plants are summarized and discussed. The signaling pathway for the roles of NO and HS in alleviating Al toxicity is also proposed.
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