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. 1969 May;44(5):631–635. doi: 10.1104/pp.44.5.631

Ethylene-controlled Induction of Phenylalanine Ammonia-lyase in Citrus Fruit Peel 1

J Riov a, S P Monselise a, R S Kahan a
PMCID: PMC396138  PMID: 16657113

Abstract

l-Phenylalanine ammonia-lyase (PAL) activity is low in the external layers (flavedo) of intact mature grapefruit peel. Flavedo discs evince upon incubation increasing PAL activity and ethylene production. Light has no effect in enhancing PAL activity in discs. Exogenous ethylene stimulates PAL activity in the flavedo of intact mature grapefruits (half maximum stimulation at 15 ppm); such activity rapidly decreases when fruit is removed from the ethylene containing atmosphere. Carbon dioxide inhibits both ethylene production and PAL activity of discs; exogenous ethylene only partly relieves PAL inhibition. Cycloheximide inhibits both PAL activity and ethylene production by flavedo discs. The same concentration of cycloheximide also inhibits PAL activity of discs in the presence of exogenous ethylene. Protein synthesis seems therefore to be needed at both levels of ethylene evolution and enhancement of PAL activity.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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