sieve-tube element
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. Compare sieve cell.
Words nearby sieve-tube element
sieve,
sieve cell,
sieve graft,
sieve of eratosthenes,
sieve tube,
sieve-tube element,
sievers,
sievert,
sieyès,
sif,
sifaka