lecture 16 (10-)

lecture 16 (10-) - Plant Anatomy I. Plant Cell A. Nucleus...

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Plant Anatomy I. Plant Cell A. Nucleus and organelles B. Central Vacuole 1. Up to 90% volume of cell 2. Tonoplast = membrane of vacuole 3. Functions a. Growth i. Adding water to vacuole adds hydrostatic pressure (turgor), and that causes the cell wall to expand b. Storage i. Example: toxic chemicals ii. Seeds- proteins get stored in vacuole c. Lysosomal function i. Break down C. Plastids 1. Membrane-bound organelles 2. Variety of functions a. Food production b. Storage 3. Types a. Chloroplasts- photosynthesis b. Amyloplasts- store starch c. Chromoplasts- store pigments i. Found abundantly in flower and fruit D. Cell Wall 1. Primary cell wall a. Found in all plant cells b. Made up of cellulose, other polysaccharides and proteins c. Hydrogen bonding between the polysaccharides i. This bonding causes them to arrange themselves into bundles of fiber d. Growing cell i. Secretes a thin, flexible primary cell wall e. Mature cell i. Either primary cell wall thickens or a secondary cell wall forms 2. Secondary cell wall a. Located between plasma membrane and primary cell wall b. Composed of polysaccharides c. Lignin- strengthening polymer i. Comprised of monomers that are derived from certain amino acids d. Support and protection e. Example: wood 3. Middle lamellae a. Between primary cell walls of adjacent cells b. Composed of Pectin- a polysaccharide i. “Glue” c. When fruit ripens, the pectin dissolves d. Thickening agent for making jams and jellies II. Plant Body A. 2 systems 1. Root- below ground 2. Shoot- above ground
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3. The two systems have different types of cells, tissues, and organs B. Cells, tissues, and Organs 1. Cell- basic functional unit of plant body a. Variety of types of plant cells 2. Tissues- group of cells that are associated and function together a. Simple- composed of only one type of cell b. Complex- composed of 2 or more types of cells 3. Tissue systems Table 33-1 a. Ground tissue system i. involved in photosynthesis ii. Storage iii. Support
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This note was uploaded on 11/30/2011 for the course BIO 119:101 taught by Professor Martin during the Fall '08 term at Rutgers.

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lecture 16 (10-) - Plant Anatomy I. Plant Cell A. Nucleus...

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