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Ethylene was reported to be important in the response to cadmium (Cd). It is generally agreed that ethylene could improve Cd resistance, but the specific mechanism is not yet clear. To make up for this gap, this paper explores the antioxidant capacity, malondialdehyde (MDA), hydrogen peroxide (H2O2) content, Cd content and the expression of relevant genes in Arabidopsis thaliana seedlings, and examines the effect of ethylene on the physiological performance of Cd-stressed seedlings. The results show that ethylene could greatly improve the Cd resistance of plants by suppressing the translocation of Cd ions. In addition, ethylene can ease the metal phytotoxicity of Cd by lowering the MDA content and H2O2 generation, and regulate the over-expression of AtATM3 and APDR8 to enhance Cd resistance. To sum up, ethylenecould enhance Cd resistance by enhancing antioxidant activity and inhibiting the translocation of Cd ions.

CONTRIBUTION OF ETHYLENE TO THE CADMIUM RESISTANCE OF THALE CRESS (ARABIDOPSIS THALIANA)