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Photorespiratory metabolism: Genes, mutants, energetics, and redox signaling

Lookup NU author(s): Professor Christine Foyer, Professor Graham Noctor

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Abstract

Photorespiration is a high-.ux pathway that operates alongside carbon assimilation in C3 plants. Because most higher plant species photosynthesize using only the C3 pathway, photorespiration has a major impact on cellular metabolism, particularly under high light, high temperatures, and CO2 or water deficits. Although the functions of photorespiration remain controversial, it is widely accepted that this pathway influences a wide range of processes from bioenergetics, photosystem II function, and carbon metabolism to nitrogen assimilation and respiration. Crucially, the photorespiratory pathway is a major source of H2O 2 in photosynthetic cells. Through H2O2 production and pyridine nucleotide interactions, photorespiration makes a key contribution to cellular redox homeostasis. In so-doing, it influences multiple signaling pathways, particularly those that govern plant hormonal responses controlling growth, environmental and defense responses, and programmed cell death. The potential influence of photorespiration on cell physiology and fate is thus complex and wide ranging. The genes, pathways, and signaling functions of photorespiration are considered here in the context of whole plant biology, with reference to future challenges and human interventions to diminish photorespiratory flux. Copyright © 2009 by Annual Reviews. All rights reserved.


Publication metadata

Author(s): Foyer C, Bloom A, Queval G, Noctor G

Publication type: Article

Publication status: Published

Journal: Annual Review of Plant Biology

Year: 2009

Volume: 60

Pages: 455-484

Print publication date: 01/06/2009

ISSN (print): 1543-5008

ISSN (electronic): 1545-2123

Publisher: Annual Reviews

URL: http://dx.doi.org/10.1146/annurev.arplant.043008.091948

DOI: 10.1146/annurev.arplant.043008.091948

PubMed id: 19575589


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