Sieve-tube-element meaning

sĭvto͝ob, -tyo͝ob
An elongated, food-conducting cell in the phloem of angiosperms, lacking a nucleus and having a sieve plate at both ends.
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An elongated, food-conducting cell in phloem in angiosperms. Unlike the tracheary elements of xylem, sieve elements have living protoplasts when mature, but they lack a nucleus and are dependent upon companion cells for certain functions. At the ends of each sieve-tube element are sieve plates, areas of the cell wall containing numerous large pores. The sieve-tube elements are aligned end to end and form continuous tubes, along which nutrients flow relatively unimpeded from cell to cell through the sieve plates. Sieve-tube elements are more specialized than the sieve cells found in gymnosperms.
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(botany) A type of sclerenchyma cell located in the phloem that is involved in the movement of carbohydrates.
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