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Xylem

Part of the woody conductive tissue of higher plants; see there.

Term for the tissue located in the cambium (growth layer below the bark) in higher plants such as vines. This is used to transport water and the nutrients dissolved in it, such as nitrates(sodium), phosphates(phosphorus) and potassium sulphates (potassium), from the roots to the leaves and shoot tips. This only takes a few minutes for a grapevine, but correspondingly longer (up to hours) for trees.

The transport takes place through two complementary processes. The water is absorbed by the roots through osmosis. The evaporation of water on the leaves creates a transpiration suction (negative pressure), which draws water upwards from the roots. A distinction is made between two completely separate transport pathways.

Xylem and phloem

The xylem (wood part, xýlon = wood) consists of wide, thick-walled...

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