The localization of enzymic activities (catalase. peroxidase, adenosinetriphosphatase) in vegetative cells of Ectocarpus sporophytes was carried out at the ultrastructural level.Catalase (EC 1.11.1.6) was only found in organelles recognizable as microbodies. Peroxidase (EC 1.11.1.7) was present in the cell wall, but the deposition of reaction product was also observed in the perinuclear space, endoplasmic reticulum, dictyosomes, and paramural space. Adenosinetriphosphatase (ATPase) (EC 3.6.1.3) was found associated with mitochondria, thylakoids, and the plasma membrane.
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Oliveira et al. (1976) studied this question.
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