Summary
Oxidative and peroxidative activities were localized at the ultrastructural level in suspension cells of an anthocyanin-producing strain of carrot after treatment with dihydroxyphenylalanine (DOPA) and diaminobenzidine (DAB). In DOPA-treated cells a reaction ascribed to polyphenoloxidase (PPO) occurred in the thylakoids of plastids. After DAB treatment at pH 9.0 reactions occurred in microbodies and plastid thylakoids; after treatment at pH 6.8 additional reactions occurred in the mitochondrial cristae and cytoplasmic ground substance. No reaction occurred in the cell walls at either pH. A reaction could not be unequivocally detected in the vacuoles because of the natural occurrence of osmiophilic material. Application of peroxidase and PPO inhibitors indicated that four distinct systems were involved in the DAB reactions: catalase was correlated with the reaction in the microbodies, peroxidase with the reaction in the cytoplasmic ground substance, cytochromes with the mitochondrial reaction, and PPO with the reaction in the thylakoids of the plastids.
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Contribution No. 1964 of the Rhode Island Agricultural Experiment Station.
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Olah, A.F., Mueller, W.C. Ultrastructural localization of oxidative and peroxidative activities in a carrot suspension cell culture. Protoplasma 106, 231–248 (1981). https://doi.org/10.1007/BF01275555
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DOI: https://doi.org/10.1007/BF01275555