Abstract

Rapid growth responses in non-dividing cells are essentially brought about by water uptake. This increased water uptake (Jv) may result from an increased driving force (Δψ) or a change in membrane permeability (Lp), thus: $$ Jv = L_{p}^{{}}\;\Delta \psi $$ A change in Lp may affict the rate at which equilibrium is achieved but not the extent of water uptake neede to reach equilibrium. An increased driving force may arise from a change in turgor pressure (ΔP), a change in osmotic pressure (Δπ) or a change in the reflection coefficient (selective permeability, σ)of the membrane.

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