Radical Formation and Peroxidative Activity of Phytotoxic Diphenyl Ethers

Open Access
Publisher Website
Google Scholar
Abstract
Phenyl-t-butylnitrone can be used to trap light-induced radicals with isolated chloroplasts, measurable by ESR technique. The radical signals are dramatically amplified and their lifetime prolonged in the presence of peroxidizing diphenyl ethers. A para-substitution with -NO2, - Cl-or - I is necessary, as well as an operating photosynthetic electron transport. The nature of radicals is not yet clear; they may be alkyl or linolenic-acid radicals, but their presence indicates peroxidation. Furthermore, the ESR measurements presented strengthen our hypothesis that peroxidative activity of paraquat and diphenyl ethers are not caused by the same mechanism.

This publication has 0 references indexed in Scilit: