Week 3, Lecture 1, C3 & C4

Week 3 Lecture 1, - Alternative Mechanisms of Carbon Fixation C3 Plants C4 Plants CAM Plants Carbon dioxide diffuse into leaves through stomata H2

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Alternative Mechanisms of Carbon Fixation C 3 Plants C 4 Plants CAM Plants Limiting Factors of Photosynthesis One of the major problems facing terrestrial plants is dehydration. At times, solutions to this problem conflict with other metabolic processes, especially photosynthesis. The stomata are not only the major route for gas exchange (CO 2 in and O 2 out), but also for the evaporative loss of water. On hot, dry days plants close the stomata to conserve water, but this causes problems for photosynthesis. Alternative mechanisms of carbon fixation have evolved in hot, arid climates Leaf cross-section CO 2 H 2 O Carbon dioxide diffuse into leaves through stomata 2 Problem exists in dry conditions where CO 2 is needed for photosynthesis but H 2 O is lost C3 Plants C 3 Plants cotton rice spinach lettuce carrot petunia apple quackgrass cocklebur beans
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In most plants ( C 3 plants ) initial fixation of CO 2 occurs via rubisco Æ three-carbon compound, 3-phosphoglycerate. These plants include rice, wheat, and soybeans. When their stomata are closed on a hot, dry
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This note was uploaded on 04/18/2010 for the course BIOLOGY 1223 taught by Professor Gardiner/lajoie during the Fall '09 term at UWO.

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Week 3 Lecture 1, - Alternative Mechanisms of Carbon Fixation C3 Plants C4 Plants CAM Plants Carbon dioxide diffuse into leaves through stomata H2

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