sieve plate

plant anatomy

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July 13, 2026

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In plant anatomy, a sieve plate is a specialized area on the end walls of sieve tube elements. These elements are the primary conduits for transporting food, mainly sugars, from the leaves to other parts of the vascular plant through the phloem. Sieve tube elements are living cells, but they lose their nuclei and other organelles as they mature, relying on adjacent companion cells for metabolic support. The sieve plate's pores allow for the passage of cytoplasm between these cells, facilitating efficient transport throughout the plant.12

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angiosperm
Organization of the vascular tissue
…the latter are known as sieve plates. Sieve plates are mostly located on the overlapping adjacent end walls. As sieve-tube members differentiate, they lose their nucleus, ribosomes, vacuoles, and dictyosomes (the equivalent of the Golgi apparatus in animals); they are not dead, however, and remain metabolically active. Each sieve-tube member…
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…the latter are known as sieve plates. Sieve plates are mostly located on the overlapping adjacent end walls. As sieve-tube members differentiate, they lose their nucleus, ribosomes, vacuoles, and dictyosomes (the equivalent of the Golgi apparatus in animals); they are not dead, however, and remain metabolically active. Each sieve-tube member…
Read More