Involved in basal resistance against pathogens. (+)-neomenthol + NADP(+) = (1R,4S)-menthone + H(+) + NADPH Optimum pH is 9.0 for the forward reaction and 7.5 for the reverse reaction. Monomer. Expressed in flowers and red fruit tissues. Not detected in leaves, stems, roots or green fruits. Strongly induced by inoculation with an avirulent strain of pathogen, but not with a virulent strain. Induced by salicylic acid, ethylene, abscisic acid and drought. Not induced by cold, wounding or H(2)O(2). Belongs to the short-chain dehydrogenases/reductases (SDR) family.