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To examine whether 1 m m  of spermidine (Spd) modifies plant ethylene production in response to short-term salt stress, cucumber ( Cucumis sativus ) seedlings were grown in nutrient solution with or without 75 m m  NaCl stress for 3 days, and the leaves were sprayed with 1 m m  Spd or water (control). We investigate the effects of the treatments on ethylene production, 1-aminocyclopropane-1-carboxylate (ACC) content, 1-(malonylamino) cycolpvopane-1-carboxylic acid (MACC) content, activities of 1-aminocyclopropane-1-carboxylate synthase (ACS), and 1-aminocyclopropane-1-carboxylate oxidase (ACO) and gene expression of  acs2 ,  aco1,  and  aco2  in the cucumber leaves. The results indicate that ethylene production was increased significantly under salt stress as did ACC and MACC content, the activities of ACS and ACO, and the transcriptional level of  acs2 , whereas the gene expression of  aco1  and  aco2  was somewhat decreased. However, exogenous Spd treatment depressed the content of ACC and MACC, ACS activity, and the level of  acs2  transcripts in the leaves of salt-stressed cucumber. Although the activity of ACO and gene expressions of  aco1  and  aco2  increased by Spd, ethylene emission was inhibited. Our results suggest that application of exogenous Spd could reverse salinity-induced ethylene production by inhibiting the transcription and activity of ACS under salt stress. We conclude that exogenous Spd could modify the biosynthesis of ethylene to enhance the tolerance of cucumber seedlings to salt stress.

Exogenous Spermidine Inhibits Ethylene Production in Leaves of Cucumber Seedlings under NaCl Stress