Changes in Rubisco kinetics during the evolution of C 4 Photosynthesis in Flaveria (Asteraceae) are associated with positive selection on genes encoding the enzyme
Rubisco, the primary photosynthetic carboxylase, evolved 3-4 billion years ago in an anaerobic, high CO2 atmosphere. The combined effect of low CO2 and high O2 levels in the modern atmosphere, and the inability of Rubisco to distinguish completely between CO2 and O2, leads to the occurrence of an oxygenation reaction that reduces the efficiency of photosynthesis. Among land plants, C4 photosynthesis largely solves this problem by facilitating a high CO2/O2 ratio at the site of Rubisco that...[Show more]
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|Source:||Molecular Biology and Evolution|
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