Abstract:

This review focused on the cloning, expression and regulation of key enzyme genes, such as phenylalanine ammonia-lysate genes (PALs), 4-coumarate-CoA ligase genes (4CLs), cinnamyl alcohol dehydrogenase genes (CADs), peroxidase genes (POXs), laccase genes (LACs), and dirigent genes (DIRs), which were related to the pathway of lignin biosynthesis. It would provide some ideas for regulating content and chemical composition of plant lignin and obtaining improved new plant resource by genetic manipulation at the key metabolic steps through disclosing the molecular characterization of the above key enzyme genes related to the pathway of lignin biosynthesis.