A preliminary investigation of L-phenylalanine ammonialyase activity in asparagus: Distribution and response to storage, excision and incubation

摘要

The level of L-phenylalanine ammonia-lyase (PAL) (E.C. 4.3.1.5) activity was greatest in the basal portion of freshly harvested asparagus spears and decreased toward the tips. Basal disks developed large increases in L-phenylalanine ammonia-lyase activity in response to excision and incubation. The level of PAL activity measured in basal tissue of intact spears increased with storage, while the ability of the same tissue to respond to excision and incubation with increased PAL activity was lost.