Studies in the brown alga Ectocarpus in culture: ultrastructural localization of enzymic activities

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Abstract
The localization of enzymic activities (catalase, peroxidase, ATPase) 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. ATPase (EC 3.6.1.3) was associated with mitochondria, thylakoids and the plasma membrane.