Discussion
Mutation in ACC synthase enzyme will inhibit synthesis of ................
Answer: C
A mutation in ACC synthase blocks the synthesis of ethylene.
Ethylene is made from methionine through S-adenosylmethionine (SAM). ACC synthase converts SAM to 1-aminocyclopropane-1-carboxylic acid (ACC), usually the rate-limiting step, and ACC oxidase then converts ACC to ethylene. Tomatoes with suppressed ACC synthase ripen slowly for this reason.
Gibberellins come from the terpenoid pathway, salicylic acid (printed 'Salicyclic') from the phenylpropanoid or isochorismate pathway, and auxin mainly from tryptophan, so none depends on ACC synthase.
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