Sieve tube elements are long, tube-like, arranged longitudinally and associated with companion cells, with perforated end walls forming sieve plates; they lack a nucleus. Sieve cells are present in Lower plants.
Gli elementi dei tubi cribosi sono lunghi, tubuliformi, disposti longitudinalmente con cellule compagne, con estremità perforate che formano le placche cribrose; mancano di nucleo. Le cellule cribrose sono presenti nelle piante inferiori.
| Text | Sieve tube elements are
also long, tube-like structures, arranged longitudinally and are associated with companion cells. Their end walls are perforated in a sieve-like manner to form the sieve plates. A mature sieve element possesses a peripheral cytoplasm and a large vacuole but lacks a nucleus. The functions of sieve tubes are controlled by the nucleus of companion cells Sieve cells are present in Lower plants rather than Tubes |
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