L14 Transport I

L14 Transport I - PlantCellStructureII:Chapter2 1....

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Review of Lecture 13 Plant Cell Structure II: Chapter 2 1. The Cytoskeleton 2. Motor proteins 3. Cell Membranes 4. Cell Walls 5. Plasmodesmata
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The Three Cytoskeletal Components Each type of component varies in diameter with  two of the three types forming hollow tubes Chap. 2, pg. 37
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Motor Proteins 1. Also known as “Walking Molecules” 2. Associate with microtubules and microfilaments 3. ATP-dependent movement process 4. Microtubules and microfilaments provide  scaffolding or tracks that guide these molecules to  their destinations
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Cell Membranes A variety of proteins attach to or are embedded in the  membrane Chap.2, pg.39
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Plant Cell Walls 1. Surrounds the plasma membrane 2. Functions to prevent water loss and provides  structural support 3. The  primary cell wall  is immediately outside of  the plasma membrane 4. The  secondary cell wall , if present, is between  the plasma membrane and primary cell wall  (provides structural support to trees)
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Primary Cell Wall Secondary Cell Wall Secondary Cell Wall Plasma Membrane vacuole vacuole cytoplasm
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Plant Cell Walls 1. Mainly composed of cellulose (polymers of glucose) 2. Form  microfibrils  (10-25nm)which are made up  of bundles of cellulose molecules 3. Microfibrils are linked to form crystalline subunits  called  micelles 4. Pectin (protein) and hemicelluloses (carbohydrates)  form links  
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Plant Cell Walls 1. Microfibrils form larger bundles called  macrofibrils  (0.5µm in diameter and 4µm long) 2. Lignins, in turn, provide rigid strength to cell  walls 3. Cell walls surrounding individual cells are  separated from adjacent cell walls by the  middle lamella (Latin, “lamina”, thin plate) which is  composed mainly of pectins
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Synthesis of Cellulose Microfibrils ©Raven, Evert and Eichhorn, Biology of Plants, 6th edition
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Plasmodesmata From Raven, Evert and Eichhorn. 2005. Biology of Plants. Freeman and Company Publishers
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http://www.tulane.edu/~dmsander/WWW/335/pdtitle.gif pegacat.com/cbetts/ phd/cellintro/cellintro.html Hypothetical 3D Structure Actin Plasma Membrane Proteinaceous struts desmotubule
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The challenges 1. Harvesting light energy 2. Staying wet when things get dry 3. Dealing with gravity 4. Divide or be conquered  5. Leveraging resources
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Lecture 14 Outline 1. Transport in plants: Chapter 10 2. Mechanisms used to move substances into and  out of cells 3. Principles of water movement a) Crossing a membrane b) Aquaporins c) Turgor Pressure d) Water Potential
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Transport in Plants 1. Molecules can move through ‘living’ space (the 
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L14 Transport I - PlantCellStructureII:Chapter2 1....

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