CH36 - Transport in Vascular Plants Transport in Plants...

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Transport in Vascular Plants Chapter 36 Transport in Plants ± Three levels of transport Transport of materials into individual cells Cell to cell transport Long distance transport Passive Transport: ± Driven by principles of diffusion Much of the diffusion is facilitated Selective channels are usually gated and regulated Active Transport ± Proton pump Generates membrane potential and stored potential energy. Transport of many other molecules is regulated via the proton pump Water Potential & Osmosis ± Water moves from high to low water potential Water potential = Ψ (Psi) Ψ is measured in MPa Pure water open to the atmosphere ± Ψ = 0 Mpa Most Plant Cells ± Ψ = 1 Mpa Water Pressure in your Home Plumbing ± Ψ = 0.25 Mpa
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Water Potential ± Affected by pressure and solute concentration Ψ = Ψ S + Ψ P Ψ S is proportional to the number of dissolved solutes Ψ P is proportional to the number of dissolved solutes Aquaporins
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This note was uploaded on 03/27/2012 for the course BIO 1442 taught by Professor Britton during the Spring '11 term at University of Florida.

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CH36 - Transport in Vascular Plants Transport in Plants...

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