Summary
Stages in the development of polyphosphate bodies in the blue-green alga, Plectonema boryanum, grown under continuous illumination in the presence of excess phosphate, are reported. During the first stage, an electronlucent area appears near the nucleoplasm or cross walls; it gradually increases to a size approximately equal to that of the final polyphosphate body. In this area a porous structure of medium electron density develops, while simultaneously electron-dense material, interpreted as polyphosphate, is deposited in the adjacent cytoplasm. Eventually, this material seems to penetrate into the porous structure. When the polyphosphate bodies are fully formed, the surrounding cytoplasm does not contain detectable amounts of polyphosphate.
The formation of polyphosphate bodies in P. boryanum is compared with that in some bacterial species.
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Jensen, T.E. Fine structure of developing polyphosphate bodies in a blue-green alga, Plectonema boryanum . Archiv. Mikrobiol. 67, 328–338 (1969). https://doi.org/10.1007/BF00412580
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DOI: https://doi.org/10.1007/BF00412580