The ability of acetaldehyde to influence ethylene production appears to be dependent
on whether ACC has been supplied exogenously. In the absence of ACC,
low concentrations of acetaldehyde appear to increase ethylene production; an
effect which is lost, or inhibited, as the acetaldehyde concentration is increased.
At the same time, ethanol also increased ethylene production at higher concentrations,
although this may also be through low concentrations of acetaldehyde. The
concentration dependent effects of ethanol and acetaldehyde require a full-scale
dose-response experiment to determine their precise roles.