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Photorespiration and the Evolution of C 4 Photosynthesis

Photorespiration and the Evolution of C 4 Photosynthesis C 4 photosynthesis is one of the most convergent evolutionary phenomena in the biological world, with at least 66 independent origins. Evidence from these lineages consistently indicates that the C 4 pathway is the end result of a series of evolutionary modifications to recover photorespired CO 2 in environments where RuBisCO oxygenation is high. Phylogenetically informed research indicates that the repositioning of mitochondria in the bundle sheath is one of the earliest steps in C 4 evolution, as it may establish a single-celled mechanism to scavenge photorespired CO 2 produced in the bundle sheath cells. Elaboration of this mechanism leads to the two-celled photorespiratory concentration mechanism known as C 2 photosynthesis (commonly observed in C 3 –C 4 intermediate species) and then to C 4 photosynthesis following the upregulation of a C 4 metabolic cycle. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews

Photorespiration and the Evolution of C 4 Photosynthesis

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Publisher
Annual Reviews
Copyright
Copyright © 2012 by Annual Reviews. All rights reserved
ISSN
1040-2519
DOI
10.1146/annurev-arplant-042811-105511
pmid
22404472
Publisher site
See Article on Publisher Site

Abstract

C 4 photosynthesis is one of the most convergent evolutionary phenomena in the biological world, with at least 66 independent origins. Evidence from these lineages consistently indicates that the C 4 pathway is the end result of a series of evolutionary modifications to recover photorespired CO 2 in environments where RuBisCO oxygenation is high. Phylogenetically informed research indicates that the repositioning of mitochondria in the bundle sheath is one of the earliest steps in C 4 evolution, as it may establish a single-celled mechanism to scavenge photorespired CO 2 produced in the bundle sheath cells. Elaboration of this mechanism leads to the two-celled photorespiratory concentration mechanism known as C 2 photosynthesis (commonly observed in C 3 –C 4 intermediate species) and then to C 4 photosynthesis following the upregulation of a C 4 metabolic cycle.

Journal

Annual Review of Plant BiologyAnnual Reviews

Published: Jun 2, 2012

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