Plant Physiology 78:211-214 (1985)
© 1985 American Society of Plant Biologists
Articles
Cyclic and Noncyclic Photophosphorylation in Isolated Guard Cell Chloroplasts from Vicia faba L. 1
Ken-Ichiro Shimazaki and
Eduardo Zeiger
Department of Biological Sciences, Stanford University, Stanford, California 94305
High rates of both cyclic and noncyclic photophosphorylation were measured in chloroplast lamellae isolated from purified guard cell protoplasts from Vicia faba L. Typical rates of light-dependent incorporation of 32P into ATP were 100 and 190 micromoles ATP per milligram chlorophyll per hour for noncyclic (water to ferricyanide) and cyclic (phenazine methosulfate) photophosphorylation, respectively. These rates were 50 to 80% of those observed with mesophyll chloroplasts. Noncyclic photophosphorylation in guard cell chloroplasts was completely inhibited by 3-(3,4-dichlorophenyl)-1,1-dimethylurea supporting the notion that photophosphorylation is coupled to linear electron flow from photosystem II to photosystem I. Several lines of evidence indicated that contamination by mesophyll chloroplasts cannot account for the observed photophosphorylation rates.
A comparison of the photon fluence dependence of noncyclic photophosphorylation in mesophyll and guard cell chloroplasts showed significant differences between the two preparations, with half saturation at 0.04 and 0.08 millimole per square meter per second, respectively.
1 Supported by the National Science Foundation, the United States Department of Agriculture, and the United States Department of Energy.
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