Plant Transport

Plant Transport - PLANT TRANSPORT Evolutionary journey for...

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Unformatted text preview: PLANT TRANSPORT Evolutionary journey for vascular plants onto land involved development of nutrient transport throughout a plant, which may occur over long distances Transport in vascular plants occurs on three levels 1. Transport of water and solutes by individual cells , such as root hairs 2. Short-distance transport of substances from cell to cell at the levels of tissues and organs 3. Long-distance transport within xylem and phloem at the level of the whole plant A Variety of Physical Processes Are involved in the different types of transport Individual cell uptake H2O and minerals H2O and minerals transported in xylem sap Transpiration creates the force to pull xylem sap upwards Sugars produced by photosynthesis Sugars are transported in phloem sap throughout the plant Roots exchange gases for cellular respiration Transport begins at Individual Cells The selective permeability of a plant cells plasma membrane Controls the movement of solutes into and out of the cell Specific transport proteins Enable plant cells to maintain an internal environment different from their surroundings Central Role for H+ ATPase v ATP phosphate bond energy converted to H+ electrochemical gradient across plasma membrane 1. Inward H+ chemical gradient 2. Inside negative membrane potential to electrically attract H+ and other cations Inside Negative Membrane Potential + CYTOPLASM EXTRACELLULAR FLUID Cations ( , for example) are driven into the cell by the membrane potential. Transport protein K + K + K + K + K + K + K + K + + + (a) Membrane potential and cation uptake + + drives CATION ENTRY into the Cell Important for controlling stomata opening & closing H+ Electrochemical Gradient drives Transport into Plant Cells H + H + H + H + H + H + H + H + H + H + H + H + N O 3 N O 3 N O 3 N O 3 N O 3 N O 3 + + + + + + (b) Cotransport of anions H + H + H + H + H + H + H + H...
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Plant Transport - PLANT TRANSPORT Evolutionary journey for...

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