Document Detail

Photorespiration and the evolution of C4 photosynthesis.
MedLine Citation:
PMID:  22404472     Owner:  NLM     Status:  MEDLINE    
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.
Rowan F Sage; Tammy L Sage; Ferit Kocacinar
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review     Date:  2012-01-30
Journal Detail:
Title:  Annual review of plant biology     Volume:  63     ISSN:  1545-2123     ISO Abbreviation:  Annu Rev Plant Biol     Publication Date:  2012  
Date Detail:
Created Date:  2012-05-04     Completed Date:  2013-04-04     Revised Date:  2013-06-17    
Medline Journal Info:
Nlm Unique ID:  101140127     Medline TA:  Annu Rev Plant Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  19-47     Citation Subset:  IM; S    
Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada.
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MeSH Terms
Angiosperms / classification
Biological Evolution
Carbon / metabolism*
Carbon Dioxide / metabolism
Carbon Isotopes / analysis
Cell Respiration / physiology*
Chenopodiaceae / classification
Climate Change*
Oxygen / metabolism
Photosynthesis / physiology*
Plants / classification*,  metabolism*
Poaceae / classification
Ribulose-Bisphosphate Carboxylase / metabolism
Species Specificity
Reg. No./Substance:
0/Carbon Isotopes; 124-38-9/Carbon Dioxide; 7440-44-0/Carbon; 7782-44-7/Oxygen; EC Carboxylase

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