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- Q2359239 subject Q5918182.
- Q2359239 subject Q7157153.
- Q2359239 subject Q7214341.
- Q2359239 abstract "In plant anatomy, sieve tube elements, also called sieve tube members, are a specialised type of elongated cell in the phloem tissue of flowering plants. The ends of these cells are connected with other sieve tube members, and together they constitute the sieve tube. The main function of the sieve tube is transport of carbohydrates, primarily sucrose, in the plant (e.g., from the leaves to the fruits and roots). Unlike the water-conducting xylem vessel elements that are dead when mature, sieve elements are living cells. They are unique in lacking a nucleus at maturity.At the interface between two sieve tube members in angiosperms are sieve plates, pores in the plant cell walls that facilitate transport of materials between them. Each sieve tube element is normally associated with one or more nucleated companion cells, to which they are connected by plasmodesmata (channels between the cells). Each companion cell is derived from the same mother cell as its associated sieve tube member. Sieve tube members have no cell nucleus, ribosomes, or vacuoles. Thus, they depend on companion cells to provide proteins, ATP, and signalling molecules. In leaves, companion cells help move the sugar that is produced by photosynthesis from the mesophyll tissue into the sieve tube elements. Sieve cells are long, slender, conducting cells of the phloem that do not form a constituent element of a sieve tube, but which are provided with relatively unspecialized sieve areas, especially in the tapering ends of the cells that overlap those of other sieve cells. Sieve cells are typically associated with gymnosperms, because angiosperms have the more derived sieve tube members and companion cells in their phloem. They have a narrower diameter and are more elongated compared to sieve tube members. Sieve cells are associated with albuminous cells (also called Strasburger cells), which lack starch, thus making it possible to differentiate them from phloem parenchyma.The forest botanist Theodor Hartig was the first to discover and name these cells as Siebfasern (sieve fibres) and Siebröhren (sieve tubes) in 1837.".
- Q2359239 thumbnail SieveTube.png?width=300.
- Q2359239 wikiPageExternalLink 06d.htm.
- Q2359239 wikiPageExternalLink LabSecPhloem-99.htm.
- Q2359239 wikiPageWikiLink Q1134046.
- Q2359239 wikiPageWikiLink Q11358.
- Q2359239 wikiPageWikiLink Q11982.
- Q2359239 wikiPageWikiLink Q122811.
- Q2359239 wikiPageWikiLink Q127702.
- Q2359239 wikiPageWikiLink Q128700.
- Q2359239 wikiPageWikiLink Q133712.
- Q2359239 wikiPageWikiLink Q1364.
- Q2359239 wikiPageWikiLink Q185138.
- Q2359239 wikiPageWikiLink Q25314.
- Q2359239 wikiPageWikiLink Q270524.
- Q2359239 wikiPageWikiLink Q33971.
- Q2359239 wikiPageWikiLink Q4021.
- Q2359239 wikiPageWikiLink Q40260.
- Q2359239 wikiPageWikiLink Q4027534.
- Q2359239 wikiPageWikiLink Q41500.
- Q2359239 wikiPageWikiLink Q41534.
- Q2359239 wikiPageWikiLink Q42244.
- Q2359239 wikiPageWikiLink Q5918182.
- Q2359239 wikiPageWikiLink Q67908.
- Q2359239 wikiPageWikiLink Q7157153.
- Q2359239 wikiPageWikiLink Q7214341.
- Q2359239 wikiPageWikiLink Q7868.
- Q2359239 wikiPageWikiLink Q968604.
- Q2359239 wikiPageWikiLink Q987768.
- Q2359239 comment "In plant anatomy, sieve tube elements, also called sieve tube members, are a specialised type of elongated cell in the phloem tissue of flowering plants. The ends of these cells are connected with other sieve tube members, and together they constitute the sieve tube. The main function of the sieve tube is transport of carbohydrates, primarily sucrose, in the plant (e.g., from the leaves to the fruits and roots).".
- Q2359239 label "Sieve tube element".
- Q2359239 depiction SieveTube.png.