Enzyme involved in the ethylene biosynthesis. May promote stem elongation by maximizing the extensibility cells, possibly by activating ethylene biosynthesis, in response to very-long-chain fatty acids (VLCFAs C20:0 to C30:0). 1-aminocyclopropane-1-carboxylate + L-ascorbate + O2 = CO2 + ethene + 2 H2O + hydrogen cyanide + L-dehydroascorbate Alkene biosynthesis; ethylene biosynthesis via S-adenosyl-L-methionine; ethylene from S-adenosyl-L-methionine: step 2/2. Expressed in vegetative tissues. Expressed constitutively at a low level in leaves and blades. Strongly induced by wounding, ethrel, iron, ethylene and 1-amino-cyclopropane-carboxylic acid (ACC). Accumulates in response to very-long-chain fatty acids (VLCFAs C20:0 to C30:0). Belongs to the iron/ascorbate-dependent oxidoreductase family.