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Photosynthesis Research

, Volume 100, Issue 1, pp 29–43 | Cite as

Photosynthetic electron transport and proton flux under moderate heat stress

  • Ru Zhang
  • Thomas D. SharkeyEmail author
Regular Paper

Abstract

Moderate heat stress has been reported to increase PSI cyclic electron flow (CEF). We subjected leaves of Arabidopsis (Arabidopsis thaliana) mutants disrupted in the regulation of one or the other pathway of CEF flow—crr2 (chlororespiratory reduction, deficient in regulation of chloroplast NAD(P)H dehydrogenase-dependent CEF) and pgr5 (proton gradient regulation, proposed to have reduced efficiency of antimycin-A-sensitive-CEF regulation) to moderate heat stress. Light-adapted leaves were switched from 23 to 40°C in 2 min. Gas exchange, chlorophyll fluorescence, the electrochromic shift (ECS), and P700 were measured. Photosynthesis of crr2 and pgr5 was more sensitive to heat and had less ability to recover than the genetic background gl. The proton conductance in light was increased by heat and it was twice as much in pgr5, which had much smaller light-induced proton motive force. We confirmed that P700 becomes more reduced at high temperature and show that, in contrast, the proportion of PSII open centers (with Q A oxidized) increases. The two mutants had much slower P700+ reduction rate during and after heat than gl. The proportion of light absorbed by PSI versus PSII was increased in gl and crr2 during and after heat treatment, but not in pgr5. We propose that heat alters the redox balance away from PSII and toward PSI and that the regulation of CEF helps photosynthesis tolerate heat stress.

Keywords

Chlorophyll fluorescence Cyclic electron transport around PSI Electrochromic shift Gas exchange Moderate heat stress P700 measurement 

Abbreviations

PS

Photosystem

RuBP

Ribulose-1,5-bisphosphate

ΦPSII

PSII quantum efficiency

NPQ

Non-photochemical quenching

ECS

Electrochromic shift

CEF

Cyclic electron flow around PSI

NDH

Chloroplast NAD(P)H dehydrogenase

ΔpH

Transthylakoid pH gradient

ΔΨ

Transthylakoid electrical potential

pmf

Transthylakoid proton motive force

QA

Primary electron acceptor of PSII

qL

A parameter estimating the fraction of PSII centers in the open state (with Q A oxidized)

qP

Photochemical quenching coefficient, non-linearly related to the proportion of PSII centers in the open state

Notes

Acknowledgments

We thank Dr. Toshiharu Shikanai and Dr. Archie Portis for mutant seeds. Dr. Stephen Schrader and Dr. Dafu Wang are thanked for the help on gas exchange machine build-up and the suggestions on planting mutants, respectively. We are grateful to Dr. David Kramer for excellent advice on our ECS measurements. We also appreciate the chlorophyll fluorescence equipment loaned by Dr. Robert Wise and the information from Dr. Cécile Ané about statistical analysis. The project was supported by the National Research Initiative of the USDA Cooperative State Research, Education and Extension Service, grant number 2004-35100-14860.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Department of BotanyUniversity of Wisconsin-MadisonMadisonUSA
  2. 2.Department of Biochemistry and Molecular BiologyMichigan State UniversityEast LansingUSA

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