The characters and main influence factors of the phenylalanine ammonia-lyase (PAL, EC4.3.1.5) which is one of the key enzymes in flavonoidss synthesis according to the metabolism process of flavonoidss in Ginkgo biloba leaf were completely studied with the enzyme extract and off-body leaf. Research aim was to find out some effective ways to enhance flavonoids content via regulating PAL activity based on some PAL accelerants. These assayed materials came from Ginkgo Research Orchards in Hubei Agr...