Aldehyde decarbonylase involved in the conversion of aldehydes to alkanes. Core component of a very-long-chain alkane synthesis complex (By similarity). Required for the formation of wax layers conferring cuticular permeability and drought tolerance (PubMed:19322663). a long-chain fatty aldehyde + H(+) + 2 NADPH + O2 = a long-chain alkane + formate + H2O + 2 NADP(+) Homodimer. Expressed in germinating seeds, radicals and leaves. Induced by drought and abscisic acid (ABA). Early leaf-rolling at the reproductive stage. Reduced wax accumulation (lower total proportions of aldehydes, fatty acids, alkanes and alcohol) in leaf cuticle leading to an increased cuticular permeability (e.g. chlorophyll leaching) and a subsequent altered drought resistance due to rapid water loss. Belongs to the sterol desaturase family.