JXB Advance Access published online on May 28, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erg186
© 2003 by Oxford University Press
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1 Department of Biological Sciences, University of Essex, Colchester CO4 3SQ, UK
* To whom correspondence should be addressed. E-mail: morisj{at}essex.ac.uk.
High resolution chlorophyll a fluorescence imaging was used to compare the photosynthetic efficiency of PSII electron transport (estimated by Fq'/Fm') in guard cell chloroplasts and the underlying mesophyll in intact leaves of six different species: Commelina communis, Vicia faba, Amaranthus caudatus, Polypodium vulgare, Nicotiana tabacum, and Tradescantia albifora. While photosynthetic efficiency varied between the species, the efficiencies of guard cells and mesophyll cells were always closely matched. As measurement light intensity was increased, guard cells from the lower leaf surfaces of C. communis and V. faba showed larger reductions in photosynthetic efficiency than those from the upper surfaces. In these two species, guard cell photosynthetic efficiency responded similarly to that of the mesophyll when either light intensity or CO2 concentration during either measurement or growth was changed. In all six species, reducing the O2 concentration from 21% to 2% reduced guard cell photosynthetic efficiency, even for the C4 species A. caudatus, although the mesophyll of the C4 species did not show any O2 modulation of photosynthetic efficiency. This suggests that Rubisco activity is significant in the guard cells of these six species. When C. communis plants were water-stressed, the guard cell photosynthetic efficiency declined in parallel with that of the mesophyll. It was concluded that the photosynthetic efficiency in guard cells is determined by the same factors that determine it in the mesophyll.
© 2003 Society for Experimental Biology
RESEARCH PAPER
The responses of guard and mesophyll cell photosynthesis to CO2, O2, light, and water stress in a range of species are similar
Abstract 
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  K. Omasa, A. Konishi, H. Tamura, and F. Hosoi 3D Confocal Laser Scanning Microscopy for the Analysis of Chlorophyll Fluorescence Parameters of Chloroplasts in Intact Leaf Tissues Plant Cell Physiol., January 1, 2009; 50(1): 90 - 105. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 I. Baroli, G. D. Price, M. R. Badger, and S. von Caemmerer The Contribution of Photosynthesis to the Red Light Response of Stomatal Conductance Plant Physiology, February 1, 2008; 146(2): 737 - 747. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. M. Messinger, T. N. Buckley, and K. A. Mott Evidence for Involvement of Photosynthetic Processes in the Stomatal Response to CO2 Plant Physiology, February 1, 2006; 140(2): 771 - 778. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. von Caemmerer, T. Lawson, K. Oxborough, N. R. Baker, T. J. Andrews, and C. A. Raines Stomatal conductance does not correlate with photosynthetic capacity in transgenic tobacco with reduced amounts of Rubisco J. Exp. Bot., June 1, 2004; 55(400): 1157 - 1166. [Abstract] [Full Text] [PDF]
|
|