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Title: Activation of cyclic electron flow by hydrogen peroxide in vivo

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Plant Research Laboratory and, Departments of bPlant Biology and
  2. School of Molecular Biosciences and, Institute for Biological Chemistry, Washington State University, Pullman, WA 99164, and
  3. Plant Research Laboratory and
  4. Plant Research Laboratory and, Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824,
  5. Institute of Developmental and Molecular Biology of Plants, Plant Molecular Physiology and Biotechnology Group, Heinrich-Heine-Universität, Cluster of Excellence on Plant Sciences (CEPLAS), 40225 Düsseldorf, Germany
  6. Plant Research Laboratory and, Departments of bPlant Biology and, Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824,

Cyclic electron flow (CEF) around photosystem I is thought to balance the ATP/NADPH energy budget of photosynthesis, requiring that its rate be finely regulated. The mechanisms of this regulation are not well understood. We observed that mutants that exhibited constitutively high rates of CEF also showed elevated production of H2O2. We thus tested the hypothesis that CEF can be activated by H2O2 in vivo. CEF was strongly increased by H2O2 both by infiltration or in situ production by chloroplast-localized glycolate oxidase, implying that H2O2 can activate CEF either directly by redox modulation of key enzymes, or indirectly by affecting other photosynthetic processes. CEF appeared with a half time of about 20 min after exposure to H2O2, suggesting activation of previously expressed CEF-related machinery. H2O2-dependent CEF was not sensitive to antimycin A or loss of PGR5, indicating that increased CEF probably does not involve the PGR5-PGRL1 associated pathway. In contrast, the rise in CEF was not observed in a mutant deficient in the chloroplast NADPH:PQ reductase (NDH), supporting the involvement of this complex in CEF activated by H2O2. In conclusion, we propose that H2O2 is a missing link between environmental stress, metabolism, and redox regulation of CEF in higher plants.

Research Organization:
Washington State Univ., Pullman, WA (United States); Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Laboratory; Heinrich Heine Univ., Dusseldorf (Germany)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG)
Grant/Contract Number:
FG02-11ER16220; SC0007101; FG02-04ER15559; FG02-91ER20021; MA2379/11-1
OSTI ID:
1235192
Alternate ID(s):
OSTI ID: 1348375
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 112 Journal Issue: 17; ISSN 0027-8424
Publisher:
Proceedings of the National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 100 works
Citation information provided by
Web of Science

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