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Unformatted text preview: Topic 8 Cell Types in Plants Cell Types Parenchyma Collenchyma Sclerids and Fibers Tracheids Vessel Elements Sieve Tube Elements Properties of Parenchyma Cells Living Cells Primary Cell Walls Undifferentiated Capable of Becoming Meristematic Highly Vacuolated Major Contributor to Ground Tissue Parenchyma Parenchyma Parenchyma Parenchyma Cells In Leaves
Cuticle Upper Epidermis Chlorenchyma Lower Epidermis Parenchyma Tetrkaidecahedrons Collenchyma
Living cells Very thick primary cell walls Functions as protective tissue Found in phloem in vascular bundles Collenchyma Cell Collenchyma
thickened primary wall Collenchyma Collenchyma Collenchyma Collenchyma Collenchyma Collenchyma Sclerenchyma Non-Living Cells Functions to Strengthen and Make Rigid Thick Secondary Cell Walls Fibers Sclerids Sclerid or "Stone Cell" "Stone Cells" Astrosclerids Astrosclerids in Leaf Brachyosclerids Osteosclerids Sclerids in Wound Response Fibers Mascerated Wood TEM of Fiber Diagram of Fiber Phloem Fibers Collenchyma and Fibers Phloem Fibers Fibers in Wood Bundle of Fibers Tracheids Non-Living Cells Moderately Thick Cell Walls Function for Both Strength and Transport of Water Tapered End Walls Bordered Pits Tracheids q
Tracheids Tracheids in Wood Bordered Pits
Operation of a bordered pit SEM Bordered Pit Pit Membrane and Torus Full and HalfBordered Pits Vessel Elements Non-Living Cells Secondary Walls Not Overly Thick End Walls Flat With Sclariform Perforation Plates or Open Short and Wide Simple Pits Function for Water Transport Only Vessel Elements
perforation plates Spiral Wall Thickenings Spiral Wall Thickenings Simple Pits and Wall Thickenings Evolution of the Perforation Plate Vessel Elements Fiber Perforation Plate SEM Simple Pits end wall end wall SEM Vessel Element Sieve Tube Elements Living cells Function in sugar transport No nucleus End walls have sieve plate Presence of callose and P protein Accompanied by companion cells Diagram: Sieve Member and Companion Cell
1 inclined simple sieve plate; 2 phloem parenchyma cells, 3 companion cell; 4 sieve tube members; 5 sieve tube plastids and mitochondria; 6 parenchyma plastid Sieve Members and Companion Cells callose callos e TEM Sieve Plate
1 companion cells; 2 sieve tube content; 3 parenchyma cell; 4 sieve plate (oblique view); 5 one sieve element; 6 sieve plate (side view); 7 plasmalemma of the sieve tube; 8 original site of moving sieve tube sap, but possibly P-protein due to artifact of fixation; 9 plastids; 10 phloem parenchyma cell Sieve Plate of Sieve Tube Element P Protein in Sieve Plate Sieve Plates and Callose Plugs Callose Plugs
Companion cells Phloem parenchyma ...
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- Spring '08