Photosynthesis, Carbon Fixation And - Research Article from Macmillan Science Library: Plant Sciences

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Significance of Carbon Fixation Reactions

The choice of CO2 fixation pathway has profound implications for how a plant responds to the innumerable combinations of light intensity, leaf internal CO2 concentration, temperature, and water status in the natural environment. As discussed above, at normal atmospheric CO2 levels photosynthesis is lower by at least 25 percent in C3 plants than it would be if photorespiration were absent. The generally higher rates of photosynthesis in C4 plants are attributable to both suppression of photorespiration in these species and the superior ability of PEP carboxylase to fix CO2 at the very low concentrations of this gas that can occur inside leaf tissue. These differences are most pronounced at high light intensity. Photosynthesis in C3 leaves attain maximal rates at light levels of about 50 percent of full sunlight. However, C4 photosynthesis continues to increase with light intensity even in full sunlight. It...

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This section contains 2,215 words
(approx. 8 pages at 300 words per page)
Buy the Photosynthesis, Carbon Fixation And Encyclopedia Article
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Macmillan Science Library: Plant Sciences
Photosynthesis, Carbon Fixation And from Macmillan Science Library: Plant Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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