29topic_6_f07

29topic_6_f07 - Topic 6 Topic 6 Plant Cell Walls? Plant...

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Unformatted text preview: Topic 6 Topic 6 Plant Cell Walls? Plant Cell Walls? Plant Cell Walls Plant Cell Walls Pr imar y Cell Wall Pr imar y Cell Wall Middle Lamella Middle Lamella Secondar y Cell Wall Secondar y Cell Wall Secondar y Secondar y Metabolites Metabolites Functions of Cell Walls Functions of Cell Walls • Pr ovide tensil str ength and Pr ovide tensil str ength and plasticity plasticity • Tubes for long distance Tubes for long distance tr anspor t tr anspor t • Pr evention of water loss Pr evention of water loss • Pr otection fr om insects and Pr otection fr om insects and pathogens pathogens • Vehicle for cell to cell Vehicle for cell to cell communication communication Gr owth and Gr owth and Development Development • Cell division involves Cell division involves synthesis of a new cell wall synthesis of a new cell wall • Cell enlar gement involves Cell enlar gement involves changes in cell wall changes in cell wall composition composition • Cell differ entiation also Cell differ entiation also involves changes in involves changes in composition composition Cytokinesi Cytokinesi s s Cell Plate Cell Cell Plate/Phr agmoplast Plate/Phr agmoplast Pr ophase I ---------------Metaphase----------------I I ---------Anaphase---------I Telophase Cell Plate Mitosis and Cell Plate Mitosis and Cell Plate For mation For mation Cell Walls Consist of 3 Cell Walls Consist of 3 Layer s Layer s • The middle lamella middle lamella is the fir st layer for med • N ext comes the pr imar y wall pr imar y wall which is between the middle lamella and the plasmalemma plasmalemma • The secondar y wall secondar y wall (if the cell is going to have one) is secr eted between the pr imar y wall and the plasmalemma a The Thr ee Layer s of the Cell Wall Apoplas Apoplas t t vs vs Symplas Symplas t t Apoplast Symplast (contiguo us cytoplasm Pr imar y Pr imar y Pit Fields Pit Fields Plasmodesmata Plasmodesmata Pr imar y Pit Fields Pr imar y Pit Fields Plasmodesmata Plasmodesmata Cell Wall...
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This note was uploaded on 04/08/2008 for the course BIO 29 taught by Professor Mcgowan during the Spring '08 term at CUNY Brooklyn.

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29topic_6_f07 - Topic 6 Topic 6 Plant Cell Walls? Plant...

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