Betaine aldehyde dehydrogenase in plants

Abstract Plant betaine aldehyde dehydrogenases (BADHs) have been the target of substantial research, especially during the last 20 years. Initial characterisation of BADH as an enzyme involved in the production of glycine betaine (GB) has led to detailed studies of the role of BADH in the response of plants to abiotic stress in vivo , and the potential for transgenic expression of BADH to improve abiotic stress tolerance. These studies have, in turn, yielded significant information regarding BADH and GB function. Recent research has identified the potential for BADH as an antibiotic‐free marker for selection of transgenic plants, and a major role for BADH in 2‐acetyl‐1‐pyrroline‐based fragrance associated with jasmine and basmati style aromatic rice varieties.