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Inhibition of wound-ethylene by eight structural analogues of 1-aminocyclopropane-1-carboxylic acid (ACC) studied seperately was investigated in unripe tomato fruit discs (Lycopersicum esculentum). The compounds tested were: trans-2-phenylcyclopropane-1-carboxylic acid (PCCA), cyclopropane-1,1-dicarboxylic acid (CDA), cyclopropylamine (CPA), cyclopropyl methyl ketone (CMK), chrysanthemyl alcohol (CHRA), 2-methyl cyclopropanecarboxylic acid (MCA), cyclopropanecarboxylic acid (CCA), 2-methyl-cyclopropane-methanol (2-MCM). The level of inhibition was a function of treatment concentration and time. Differential inhibition induced by the tested compounds was related to their structure.