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• W1606296871 startingPage "96" @default.
• W1606296871 abstract "Abstract Researches on ultrastructure of Avena coleoptile. 3. The sieve elements. — A study on the ultrastructural organization of the mature sieve elements of Avena coleoptile has been carried out. Data suggest that functional phloem tubes are alive and remain alive until they are working. Judging on morphological basis, the metabolic activity of sieve elements should be of peculiar type and low in comparison to that of the companion cells. In fact the cytoplasm is located in a narrow parietal strand, mitochondria, Golgi apparatus and endoplasmic reticulum are present, but they appear very modified; plastids and nucleus are absent. The cytoplasm is bounded externally by a normal plasmalemma, whilst the vacuole has no visible limits: a tonoplast is, therefore not identifiable. The strands connecting the superimposed sieve elements with one another through the sieve plate result to be made by a double membrane system very similar to the endoplasmic reticulum, which we believe to realize cytoplasmic continuity between phloem tubes. The data reported are more favorable to the existence in the sieve tubes of an active mechanism of translocation of organic solutes than a passive mass-flow. The collaboration of companion cells in the translocation mechanism has been discussed." @default.
• W1606296871 created "2016-06-24" @default.
• W1606296871 creator A5034367079 @default.
• W1606296871 creator A5057686163 @default.
• W1606296871 date "1964-01-01" @default.
• W1606296871 modified "2023-09-24" @default.
• W1606296871 title "Ricerche Sull'infrastruttura del Coleottile di Avena" @default.
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• W1606296871 doi "https://doi.org/10.1080/11263506409430524" @default.
• W1606296871 hasPublicationYear "1964" @default.
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