title: Wound-induced phenylalanine ammonia-lyase in potato tuber tissue. Development of enzyme activity and effects of antibiotics.
abstract: Phenylalanine ammonia-lyase [EC 4.3.1.5.] activity increased rapidly after a 3-hr lag period in potato tuber (Solanum tuberosum L. cv. May Queen) disks incubated in a suitable medium in the dark at 25 degrees. The activity reached a maxinum after incubation for about 40 hr. The effects of actinomycin D, 6-methylpurine, cycloheximide, chloramphenicol, and mitomycin C on the induction of phenylalanine ammonia-lyase were investigated during incubation of the disks. Actinomycin D, 6-methylpurine, and cycloheximide all inhibited the formation of phenylalanine ammonia-lyase, though cycloheximide was the most effective at low concentrations. Application of actinomycin D for the initial lag period (3 hr) caused strong inhibition; however, if it was supplied later it did not inhibit but actually increased phenylalanine ammonialyase formation. In contrast, cycloheximide was effective over most of the incubation period. Chloramphenicol and mitomycin C did not inhibit phenylalanine phenylalanine ammonialyase induction, but markedly stimulated it. Light was not an essential factor for phenylalanine ammonia-lyase induction in the wounded tissue.
mesh_terms: D000642:Ammonia-Lyases / Q000378:metabolism*; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002701:Chloramphenicol / Q000494:pharmacology; D003513:Cycloheximide / Q000494:pharmacology; D003609:Dactinomycin / Q000494:pharmacology; D004790:Enzyme Induction / Q000187:drug effects; D008027:Light; D008937:Mitomycins / Q000494:pharmacology; D010650:Phenylalanine Ammonia-Lyase / Q000378:metabolism*; D010944:Plants / Q000201:enzymology*; D011687:Purines / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D008937:Mitomycins; D011687:Purines; D003609:Dactinomycin; D002701:Chloramphenicol; D003513:Cycloheximide; D000642:Ammonia-Lyases; D010650:Phenylalanine Ammonia-Lyase