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Mechanism of paraquat tolerance in perennial ryegrass
Author(s) -
HARPER D. B.,
HARVEY B. M. R.
Publication year - 1978
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1978.tb00763.x
Subject(s) - paraquat , superoxide dismutase , catalase , lolium perenne , peroxidase , perennial plant , chemistry , hydrogen peroxide , biochemistry , biology , enzyme , botany
Relative activities of superoxide dismutase, catalase and peroxidase have been determined in crude extracts of 4 paraquat‐tolerant lines and 11 paraquat‐susceptible cultivars of perennial ryegrass ( Lolium perenne L. ) grown under controlled conditions. Paraquat‐tolerant lines showed significantly higher activities of both catalase and superoxide dismutase than susceptible cultivars and some resistant lines exhibited in addition elevated peroxidase activity. Differences in superoxide dismutase levels in isolated chloroplasts appeared to parallel those in crude extracts. It is tentatively proposed that paraquat tolerance is due to destruction of O 2 − by elevated concentrations of superoxide dismutase and detoxification of the resulting hydrogen peroxide by increased levels of catalase and peroxidase.