Summary
Root hairs of Lepidium sativum were incubated with a Wachstein-Meisel medium in experiments designed to localize the activity of nucleoside diphosphatase(s). Electron dense precipitates were found in the ER and in Golgi cisternae of the secretory face of the dictyosomes and their adjacent Golgi vesicles. Such precipitates were absent in the Golgi cisternae of the regeneration face of the dictyosomes and in the detached Golgi vesicles which extrude pectic cell wall substances. These results may be the consequence of the normal cycle of membrane compounds associated with the secretion in which the nucleoside diphosphatase(s) participate (by activation and inactivation) as one of the cycling components. Alternatively the nucleoside diphosphatase(s) may undergo a special cycle in which they are transferred from one cisterna or its vesicles to the next as part of the process of cisternal maturation.
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Zaar, K., Schnepf, E. Membranfluß und Nucleosiddiphosphatase-Reaktion in Wurzelhaaren von Lepidium sativum . Planta 88, 224–232 (1969). https://doi.org/10.1007/BF00385065
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DOI: https://doi.org/10.1007/BF00385065