According to the current model of fluid flow in xylem An increase in water tension in leaves.
The vascular plants' xylem is responsible for moving water and nutrients from the ground to a stems and leaves. Xylem provides a crucial "supporting" role by giving tissues and organs strength, preserving the structure of the plant, and resistant to bending.
Procambium and cambium, two types of meristematic cells, give rise to the cells that make up xylem tissue. These meristems have pluripotent stem cells, or so-called "stem cell niches," which have the capacity to divide constantly and sustain the stem cell population.
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