Plant and Cell Physiology Advance Access originally published online on February 8, 2005
Plant and Cell Physiology 2005 46(4):629-637; doi:10.1093/pcp/pci067
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
CO2 Response of Cyclic Electron Flow around PSI (CEF-PSI) in Tobacco Leaves—Relative Electron fluxes through PSI and PSII Determine the Magnitude of Non-photochemical Quenching (NPQ) of Chl Fluorescence
Research Institute of Innovative Technology for the Earth (RITE), 9-2 Kizugawadai, Kizu-cho, Soraku-gun, Kyoto, 619-0292 Japan
1 Corresponding author: E-mail, cmiyake{at}rite.or.jp; Fax, +81-774-75-2320.
We hypothesized that cyclic electron flow around photosystem I (CEF-PSI) participates in the induction of non-photochemical quenching (NPQ) of chlorophyll (Chl) fluorescence when the rate of photosynthetic linear electron flow (LEF) is electron-acceptor limited. To test this hypothesis, the relationships among photosynthesis rate, electron fluxes through both PSI and PSII [Je(PSI) and Je(PSII)] and Chl fluorescence parameters were analyzed simultaneously in intact leaves of tobacco plants at several light intensities and partial pressures of ambient CO2 (Ca). At low light intensities, decreasing Ca lowered the photosynthesis rate, but Je(PSI) and Je(PSII) remained constant. Je(PSI) was larger than Je(PSII), indicating the existence of CEF-PSI. Increasing the light intensity enhanced photosynthesis and both Je(PSI) and Je (PSII). Je(PSI)/Je(PSII) also increased at high light and at high light and low Ca combined, showing a strong, positive relationship with NPQ of Chl fluorescence. These results indicated that CEF-PSI contributed to the dissipation of photon energy in excess of that consumed by photosynthesis by driving NPQ of Chl fluorescence. The main physiological function of CEF-PSI in photosynthesis of higher plants is discussed.
Received July 22, 2004; Accepted January 31, 2005
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  Y. Okegawa, Y. Kagawa, Y. Kobayashi, and T. Shikanai Characterization of Factors Affecting the Activity of Photosystem I Cyclic Electron Transport in Chloroplasts Plant Cell Physiol., May 1, 2008; 49(5): 825 - 834. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Laisk, H. Eichelmann, V. Oja, E. Talts, and R. Scheibe Rates and Roles of Cyclic and Alternative Electron Flow in Potato Leaves Plant Cell Physiol., November 1, 2007; 48(11): 1575 - 1588. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Makino and R. F. Sage Temperature Response of Photosynthesis in Transgenic Rice Transformed with 'Sense' or 'Antisense' rbcS Plant Cell Physiol., October 1, 2007; 48(10): 1472 - 1483. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. Yamamoto, H. Kato, Y. Shinzaki, S. Horiguchi, T. Shikanai, T. Hase, T. Endo, M. Nishioka, A. Makino, K.-i. Tomizawa, et al. Ferredoxin Limits Cyclic Electron Flow around PSI (CEF-PSI) in Higher Plants--Stimulation of CEF-PSI enhances Non-Photochemical Quenching of Chl Fluorescence in Transplastomic Tobacco Plant Cell Physiol., October 1, 2006; 47(10): 1355 - 1371. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Laisk, H. Eichelmann, V. Oja, B. Rasulov, and H. Ramma Photosystem II Cycle and Alternative Electron Flow in Leaves Plant Cell Physiol., July 1, 2006; 47(7): 972 - 983. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Miyake, S. Horiguchi, A. Makino, Y. Shinzaki, H. Yamamoto, and K.-i. Tomizawa Effects of Light Intensity on Cyclic Electron Flow Around PSI and its Relationship to Non-photochemical Quenching of Chl Fluorescence in Tobacco Leaves Plant Cell Physiol., November 1, 2005; 46(11): 1819 - 1830. [Abstract] [Full Text] [PDF]
|
|