Abstract
SUMMARYDuring autolysis of senescent cells of the brown alga Ectocarpus the disintegration of nuclei, endoplasmic reticulum, and Golgi apparatus is completed. Degenerating mitochondria and plastids remain as the only recognizable organelles. Results from ultrastructural study in correlation with cytochemical localization of acid phosphatase indicate that lysosomal compartmentation no longer exists because the acid phosphatase reaction becomes distributed throughout the remainder of the cytoplasm and is also shown by the disintegrating plasmodesmata. Aspects of cell wall breakdown are described and related to knowledge of the chemistry of the cell wall.
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