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Title: Limitations to photosynthesis by proton motive force-induced photosystem II photodamage

The thylakoid proton motive force (pmf) generated during photosynthesis is the essential driving force for ATP production; it is also a central regulator of light capture and electron transfer. We investigated the effects of elevated pmf on photosynthesis in a library of Arabidopsis thaliana mutants with altered rates of thylakoid lumen proton efflux, leading to a range of steady-state pmf extents. We observed the expected pmf-dependent alterations in photosynthetic regulation, but also strong effects on the rate of photosystem II (PSII) photodamage. Detailed analyses indicate this effect is related to an elevated electric field (Δψ) component of the pmf, rather than lumen acidification, which in vivo increased PSII charge recombination rates, producing singlet oxygen and subsequent photodamage. The effects are seen even in wild type plants, especially under fluctuating illumination, suggesting that Δψ-induced photodamage represents a previously unrecognized limiting factor for plant productivity under dynamic environmental conditions seen in the field.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [4] ;  [6] ;  [4] ;  [6] ; ORCiD logo [7]
  1. Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, United States, Graduate Program of Cell and Molecular Biology, Michigan State University, East Lansing, United States
  2. Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, United States, Department of Chemistry, Michigan State University, East Lansing, United States
  3. Max-Planck-Institut für Molekulare Pflanzenphysiologie, Potsdam-Golm, Germany
  4. Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, United States
  5. Department of Life Sciences, Imperial College London, London, United Kingdom
  6. Department of Horticulture, Washington State University, Pullman, United States
  7. Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, United States, Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, United States
Publication Date:
Grant/Contract Number:
FG02-91ER20021
Type:
Published Article
Journal Name:
eLife
Additional Journal Information:
Journal Volume: 5; Related Information: CHORUS Timestamp: 2017-10-18 20:38:26; Journal ID: ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
OSTI Identifier:
1328499
Alternate Identifier(s):
OSTI ID: 1328500