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Plant Cell Walls

Plant Cell Walls . Chapter 3. Where is the cell wall of plant cells located?. Inside the plasma membrane Outside the plasma membrane Between the plasma membranes of two adjacent cells. The Eukaryotic Plant Cell. cell wall plasma membrane cytoplasm various organelles

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Plant Cell Walls

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  1. Plant Cell Walls Chapter 3

  2. Where is the cell wall of plant cells located? • Inside the plasma membrane • Outside the plasma membrane • Between the plasma membranes of two adjacent cells

  3. The Eukaryotic Plant Cell • cell wall • plasma membrane • cytoplasm • various organelles • cytoplasmic streaming • nucleus • vacuole bound by tonoplast

  4. Cell Wall Functions • constrains protoplast expansion • gives turgidity to plant • determines size/shape of cell • cells classified largely based upon cell wall traits • contain enzymes, absorb, transport and secrete substances • play important role in defense • NOT JUST A CONTAINER BOUNDARY

  5. Primary Cell Walls • outside of the plasma membrane • deposited while cell grows • contain thin areas • primary pit fields • plasmodesmata connect cell-to-cell • (cytoplasmic connections) • shared with adjacent cell • middle lamella • joins primary cell walls of adjacent cells

  6. Plasmodesmata

  7. Chemistry of Primary Cell Walls • cellulose • glucose monomers • bundled into microfibrils • wound and coiled into macrofibrils • hemicelluloses • polysaccharides that limit cell wall extensibility • pectins • primary cell walls and middle lamella • give wall pliability; act as cement • glycoproteins • lignins • cutin • suberin • waxes

  8. determined by cellulose microfibril orientation Cell growth

  9. Secondary Cell Walls • formed inside the primary wall • different staining qualities than primary cell wall • very thick • not present in all cells • formed after cell growth • function in strength and water transport • abundant cellulose and hemicellulose • pectins and glycoproteins absent - thus not elastic • lignins common - gives hardness and rigidity

  10. dicot stem Pine stem dicot stem Basswood stem (angiosperm stem) monocot stem Secondary Cell Wall Examples • Vascular Tissue • xylem • vessel elements • tracheids (gymnosperms) • schlerenchyma fibers • phloem • schlerenchyma fibers • Ground Tissue • schlerenchyma fibers

  11. The primary cell wall of plant cells is located inside the plasma membrane. True False

  12. True False The secondary cell wall is located inside the plasma membrane.

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