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Quantification methods of water exchanges between the plant and the…
Quantification methods of water exchanges between the plant and the environment
Osmotic pressure
Fick's Law
D : diffusion coefficient
J : Flux of substance passing through a unit area per unit time
delta c : concentration difference between 2 regions
I :path traveled by the substance
Van Hoff's Law
Cosm : osmolar concentration
R : perfect gas constant
T : temperature in Kelvin
Osmotic Potential
Terms of the expression
Ψ = hydric potential (in Pa)
π = osmotic pressure
P = pressure
Hydric Potential
Terms of the expression
Ψ = hydric potential (in Pa)
Allows us to determine the water movements
Ψs = Solute potential (in Pa)
Ψs = 0 if there is no solute
Ψp = Pression potential (in Pa)
Corresponds to the cell wall's pressure on the vacuole in turgor
Ψp = 0 when the system is at atmospheric pressure
Ψm = matrix potential (in Pa)
Ψm is negligible if there is no upwards movement
Ψg = gravitational potential (in Pa)
Ψg is negligible if system is under 10 meters tall
Ψ is always negative
Water moves from a compartment with a high hydric potential to a compartment with a lower hydric potential
Water is the only one responsible for water movements if
Plant is isothermic
Cells are semipermeable
Ψ's highest value is 0, corresponding to pure water
Water's role in plants
Water corresponds to a 60% of a plant's composition
in perpetual motion
biological solvent
limiting factor
water content
(% of Fresh Matter) = [(FM-DM)/FM]x100
(% of Dry Matter) = [(FM-DM)/DM]x100
Relative water content : RWC = (FM-DM)/(FMsat-DM) x 100
FM sat : obtained by emerging the plant entirely in the water
