Component of the floral volatile benzenoid/phenylpropanoid (FVBP) biosynthetic pathway (PubMed:19292760). Catalyzes the oxidation of benzaldehyde to benzoic acid (BA) (PubMed:19292760). Capable of oxidizing a broad spectrum of aliphatic aldehydes; increased carbon chain length results in a decrease in its efficiency (PubMed:19292760). an aldehyde + H2O + NAD(+) = a carboxylate + 2 H(+) + NADH acetaldehyde + H2O + NAD(+) = acetate + 2 H(+) + NADH benzaldehyde + H2O + NAD(+) = benzoate + 2 H(+) + NADH 2-phenylacetaldehyde + H2O + NAD(+) = 2-phenylacetate + 2 H(+) + NADH Inhibited by disulfiram. kcat is 0.31 sec(-1) with benzaldehyde as substrate (PubMed:19292760). kcat is 2.08 sec(-1) with acetaldehyde as substrate (PubMed:19292760). kcat is 0.23 sec(-1) with phenylacetaldehyde as substrate (PubMed:19292760). Optimum pH is 8. Active in a broad range of pH varying from 6 to 9. Aromatic compound metabolism. Homotetramer. Expressed predominantly in the upper and lower flower petal lobes, and, at low levels, in flower tubes, pistils, stamens and sepals. In corollas, accumulates progressively during flower development, from buds to anthesis, with a peak at flower opening, but fades out in senescing flowers. Circadian-regulation with peak levels occurring from the late afternoon hours until early morning and lowest levels during the afternoon in flowers. Belongs to the aldehyde dehydrogenase family.