NDLI: Differential effects of severe water stress on linear and cyclic electron fluxes through Photosystem I in spinach leaf discs in CO2-enriched air

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Planta : Volume 228, Issue 4, September 2008

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Planta : Volume 228, Issue 2, July 2008

Planta : Volume 228, Issue 1, June 2008

Differential effects of severe water stress on linear and cyclic electron fluxes through Photosystem I in spinach leaf discs in CO2-enriched air

Content Provider	Springer Nature Link
Author	Jia, Husen Oguchi, Riichi Hope, Alexander B. Barber, James Chow, Wah Soon
Copyright Year	2008
Abstract	Linear and cyclic electron fluxes through Photosystem I in 1% CO2 were quantified in spinach leaf tissue under severe water stress. Using actinic light with a peak at 697 nm for preferential light absorption by Photosystem I while also stimulating Photosystem II to improve redox poising, the cyclic electron flux after 60 s of illumination was a substantial proportion (33–44%) of the total electron flux through PSI at irradiances up to ~1,070 μmol photons m−2 s−1. At the maximum irradiance, the cyclic electron flux changed little with the progressive water loss from leaf tissue up to ~60%; by contrast, the linear electron flux was approximately halved. A reason for this differential effect of water stress on the capacity for cyclic and linear electron flow could be the increased crowding of soluble proteins in the stroma due to chloroplast shrinkage. Indeed the confinement of soluble proteins to a smaller chloroplast volume was indicated by cryo-scanning electron microscopy. It is known that the diffusion coefficient of large proteins is decreased when the background concentration of small proteins is raised; by contrast, the diffusion coefficient of small proteins is not affected by increasing the concentration of a large protein (Muramatsu and Minton in Proc Natl Acad Sci USA 85:2984–2988, 1988). Therefore, we suggest that linear electron flow, being coupled to the Calvin-Benson cycle, is limited by the diffusion of large macromolecules, especially the ribulose 1, 5-bisphosphate carboxylase/oxygenase complex. By contrast, cyclic electron flow, involving relatively small macromolecules such as ferredoxin, is less susceptible to inhibition by crowding in the stroma.
Starting Page	803
Ending Page	812
Page Count	10
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	228
Issue Number	5
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-07-18
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cyclic electron flow Linear electron flow Macromolecular crowding Photosystem I Water stress Forestry Ecology Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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