BIO 2137 Lecture Notes - Lecture 15: Oxygen Evolution, C3 Carbon Fixation, Vascular Bundle
17 Jul 2014
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Lilac or wheat: parenchyma like bs, no tight concentric rings of tissue. Kranz: c4 photosynthesis (subtropical grasses and weeds: ex. Sugarcane: tight concentric mesophyll and bundle sheath layers, bs cells have large chloroplasts, cells anatomy in leaves. Xerophyte leaf: multiple epidermal layer, stomates embedded in cavity, ex. Aquatic leaf: large air spaces, small veins. Lavoisier/priestly (18th century: experiments show that oxygen evolution occurs in separate light reactions from carbon dioxide fixation dark reactions, carbon dioxide + 2water --> ch2o + oxygen. Hill (1950: light reaction separated on its own, 2water + 2dcpip (dye electron acceptor) --> oxygen + 2dcpiph2. Calvin (1960: used carbon14 to show carbon dioxide fixation occurs in dark reaction separate from oxygen evolution. Light reactions: energy conservation: light reactions converts light energy to atp (biochem energy) nadph2 (reducing power, light reactions occur in thylakoid membranes in 3 steps. Note: resonance energy transfer: energy migration (energy that moves called exciton) 300 chlorophyll a, but no b or carotenes.
