Outline 24 2008 Transport systems in plants

Outline 24 2008 Transport systems in plants - Lecture 24...

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Lecture 24. TRANSPORT SYSTEMS IN PLANTS Summary. Xylem and phloem evolved in vascular plants to solve the problem of transport of inorganic and organic materials from one part of the multicellular plant to another. Inorganic materials, including water, absorbed through the roots from the soil are transported to the leaves where they are used in biosynthesis of many plant cellular compounds. Sugars, derived from photosynthesis in the leaves, are transported to the non-photosynthetic parts of the plant where they are used for energy or stored. Transport in xylem is markedly different from that in phloem. Essential to the process are the physical processes of diffusion, osmosis, selective membrane permeability, and bulk flow. Water potential, due to the combined effect of liquid pressure and solute concentration, determines the direction and magnitude of the flow of water. Reading Assignment Campbell, N. A. and Reece, J. B. (2008). Chapter 36.
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