Biology 2483A Lecture Notes - Lecture 4: Photosynthetic Pigment, Stoma, Chemosynthesis

• School: Western University
• Department: Biology
• Course: Biology 2483A
• Professor: Hugh Henry

Document Summary

Lecture 4 coping with environmental variation: energy. Dodder no photosynthetic pigment, but penetrates into vascular system of plant and sucks out sugar. Economic consequences too cause reduce plant productivity. Hydrothermal vent communities live deeeep in ocean could be dominant source of fixed energy. Another example of chemosynthesis- discolouration in water from sulfur compounds. People are interested in photosynthetic rate globally effect productivity of ecosystem. Dynamic process depends on light, carbon dioxide etc. Measure co2 uptake of plant and move from 0 to more light intensity when a plant is in the dark respires, gives off co2. But when photosynthesis starts the reparation rate meets co2 uptake need co2 uptake to be higher. Plant acclimation depending on where they are grown. Similar genotypes exposed to different light intensities green under low light. This can be a disadvantage if it is dark. Breakeven point for lower light exposed plants is lower than the other one.