phloem(redirected from Pressure flow hypothesis)
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The tissue of vascular plants that conducts food produced by photosynthesis to all parts of the plant and consists of sieve elements, fibers, and parenchyma.
(Botany) tissue in higher plants that conducts synthesized food substances to all parts of the plant
[C19: via German from Greek phloos bark]
the part of a vascular bundle consisting of sieve tubes, companion cells, parenchyma, and fibers and forming the food-conducting tissue of a plant.
[< German (1858), irreg. < Greek phló(os) bark (variant of phloiós) + -ēma deverbal n. ending]
A tissue in vascular plants that conducts food from the leaves to the other plant parts. Phloem consists primarily of tube-like cells that have porous openings. In mature woody plants it forms a sheath-like layer of tissue in the stem, just inside the bark. See more at cambium, photosynthesis. Compare xylem.
Tissue that carries food in plants.
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|Noun||1.||phloem - (botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes|
vascular tissue - tissue that conducts water and nutrients through the plant body in higher plants
sieve tube - tube formed by cells joined end-to-end through which nutrients flow in flowering plants and brown algae