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- W2073514924 abstract "In barley (Hordeum vulgare L.) and grass pea (Lathyrus sativus L.), caffeine, an inhibitor of DNA repair activity, and Na2ethylenediaminetetraacetate, an inhibitor of DNA-endonucleases, sharply decreased the excision repair of pyrimidine dimers induced in DNA by ultraviolet irradiation. An inhibitor of RNases, diethylpyro-carbonate, did not inhibit the process of excision, and in one experiment it even enhanced excision. Caffeine markedly increased the frequency of mutations and inhibited the growth of seedlings after UV-radiation. Such enhancement was greater with the higher UV fluence. Results of chemical inhibition were further confirmed by the suppression of repair by low temperatures: the frequency of chromatid aberrations induced with propyl methanesulfonate was increased more than 3 times and chromatid aberrations 1.5 times. Evidence for participation of repair enzymes in the modification of mutation processes was also obtained in the experiments which combined γ-irradiation and treatment with propyl methanesulfonate. Conditions favouring repair activity caused a drastic reduction in the frequency of aberrations, whereas with conditions preventing enzyme function the mutation frequency increased. In one of the experiments of this series we were able to demonstrate, with identical mutagenic treatment, that by changing post-mutagen conditions (wetting and drying of seeds, storage after mutagenic treatment) it was possible to alter the mutation frequency and to obtain below-additive, additive and synergistic mutational response." @default.
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- W2073514924 date "1983-07-01" @default.
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- W2073514924 title "Influence of physiological conditions on DNA repair and mutagenesis in higher plants" @default.
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- W2073514924 doi "https://doi.org/10.1111/j.1399-3054.1983.tb04197.x" @default.
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