Dehydrogenase that catalyzes the oxidation of several aminoaldehydes (PubMed:26296314). Metabolizes and detoxifies aldehyde products of polyamine degradation to non-toxic amino acids (Probable). Catalyzes the oxidation of 4-aminobutanal and 3-aminopropanal to 4-aminobutanoate and beta-alanine, respectively (PubMed:26296314). 4-aminobutanal + H2O + NAD(+) = 4-aminobutanoate + 2 H(+) + NADH 3-aminopropanal + H2O + NAD(+) = beta-alanine + 2 H(+) + NADH Optimum pH is 9.75 with 4-aminobutanal as substrate. Amine and polyamine biosynthesis; betaine biosynthesis via choline pathway; betaine from betaine aldehyde: step 1/1. Expressed in leaves, flowers and fruits. Belongs to the aldehyde dehydrogenase family.