Published on January 10, 2008
Slide1: Today: Brief review of “Plant Pigments” Begin of “Chemical Defense in Plants” (pp. 40 – 48) Quiz 5 this Thursday! Review Quiz 4. Study lectures and Reader on Plant Odors and Plant Pigments. Do Practice Questions. Slide2: Think about Topic for your Final Paper (70 Points) Your suggestion of topic is due by Tuesday, Nov.13. FINAL PAPER is due Thursday, Dec. 13 (our last lecture) (Late Papers are NOT accepted. No electronic submissions…) See back of syllabus and our class website for more details about Final paper Quiz 6 on 11/29. Quiz 7 on Dec. 20, 8 am (Final Exam day) Slide3: Final Paper on a plant-chemistry topic Length of paper: About 5 pages double spaced. Typed preferred, but very neat, well-legible handwriting is accepted. Do include some relevant chemical structures. Your paper must include: Your name, date, title Introduction (background to the topic), including relevant chemical structures Main body which should include your own thoughts A conclusion Sources (literature, websites etc.) with copies of at least one title page Plant Pigments: Plant Pigments Carotenoids Anthocyanins Betalains Flavonoids Tannins Electromagnetic Spectrum: Electromagnetic Spectrum Anthocyanins: Anthocyanins Experiment! Slide7: Betalains in plants of the order Caryophyllales Cacti, Portulacaceae, Chenopodiaceae, Nyctaginaceae ….. Flavonoids: Flavonoids Luteoline Tannins: Tannins Plants Need Defenses!: Plants Need Defenses! from animals: snails, insects, deer… Chemical defense? from fungal infections, microorganisms Chemical defense? from other plants Chemical defense? from temperature extremes Chemical defense? Chemical Plant DefensesReader pp. (pp. 40 – 48): Chemical Plant Defenses Reader pp. (pp. 40 – 48) Toxins: Toxins A great website: http://www.ansci.cornell.edu/plants/toxicagents/ Strong Odors: Strong Odors Strong odors: monoterpenes, sulfurous compounds … Slide15: Yellow Mustard Slide16: Glucosinolates in plants of the Mustard (or Cabbage) family (Brassicaceae) a glycoside! Insect resistance… Slide17: Allicin from Garlic volatile, smell.. Sticky Resins: Sticky Resins are nonvolatile, water-insoluble 20-carbon diterpenes and 30-carbon triterpenes. Chiral carbons? Sticky Gums: Sticky Gums Gums: polysaccharides composed of many sugar subunits. -D-glucose a monosaccharide Irritants: Irritants Urushiol A “phenolic” in poison oak Phenol Next time:: Next time: More plant defenses …. Quiz 5 this Thursday! Review Quiz 4. Study lectures and Reader on Plant Odors and Plant Pigments and today’s class. Do Practice Questions!