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Joint action of phenolic acid mixtures and its significance in allelopathy research
Author(s) -
Streibig Jens C.,
Olofsdotter Maria
Publication year - 2002
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1034/j.1399-3054.2002.1140312.x
Subject(s) - allelopathy , chemistry , lolium perenne , phenolic acid , coumaric acid , ferulic acid , phytotoxin , amino acid , hydroxybenzoic acid , organic chemistry , botany , biology , chromatography , perennial plant , biochemistry , germination , toxin , antioxidant
Although the ecological significance of mixtures of phytotoxins is recognized in research on chemical plant interference (allelopathy), few studies convincingly demonstrate the joint action of phytotoxin mixtures, key to understanding the ecological impact of these materials, using established models from other biological disciplines, e.g. toxicology and pharmacology. Addressing this need, the present study investigates the joint action of the phenolic acids, p ‐hydroxybenzoic, p ‐coumaric and ferulic acids on root growth inhibition of perennial ryegrass ( Lolium perenne L). The Additive Dose Model (ADM) isobole and estimated concentration of phenolic acid mixture were calculated on ED 20 , ED 50 and ED 80 from the dose–response curves for the phenolic acids applied alone or in mixtures of fixed ratios. The binary combination of three selected phenolic acids is generally antagonistic relative to the ADM. No evidence for synergistic activities of phenolic acids in the mixture was noted. Since allelopathic activities in nature are largely due to the presence of several compounds in a mixture, the present study advances understanding of the joint action of binary combination of allelochemicals in a mixture.