Catalyzes the reduction of fatty acyl-CoA and -ACP (acyl carrier protein) substrates to fatty alcohols (PubMed:19062129, PubMed:22166367). Triggers the accumulation of C16 and, to a lower extent, of C18 fatty alcohols; converts palmitoyl-acyl carrier protein to the corresponding C16:0 alcohol with NAD(P)H as electron donor (PubMed:22166367). Triggers also the formation of some C16:0 and C18:0 aldehydes (PubMed:22166367). May be involved in the generation of C30 primary alcohol (PubMed:16980563). 2 H(+) + hexadecanoyl-CoA + 2 NADPH = CoA + hexadecan-1-ol + 2 NADP(+) 2 H(+) + hexadecanoyl-[ACP] + 2 NADPH = hexadecan-1-ol + holo-[ACP] + 2 NADP(+) a long-chain fatty acyl-CoA + 2 H(+) + 2 NADPH = a long-chain primary fatty alcohol + CoA + 2 NADP(+) Highly expressed in stems (PubMed:16980563, PubMed:22166367, PubMed:22189440). Also present in flowers, leaves, siliques, pollen and roots (PubMed:22166367, PubMed:22189440). First observed in seedlings at rosette initiation sites (PubMed:22189440). In stems, expressed in the epidermal layer and the underlying few cell layers, but not in the inner cortex and vascular bundles (PubMed:22166367, PubMed:22189440). In flowers, observed in the epidermis, endothecium and tapetum of anthers, but not in the microspores (PubMed:22166367). In siliques, accumulates in the replum and receptacle (PubMed:22166367). In roots, present in emerging root primordia and in the root cap throughout lateral and primary root development (PubMed:22166367). Observed in pollen grains of anther tissues at petal differentiation stage (PubMed:22189440). Induced by wounding in the epidermal layer of mature stem internodes. No discernible phenotypic alteration in the growth and development. Belongs to the fatty acyl-CoA reductase family.