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Plant Physiology 43:1661-1665 (1968)
© 1968 American Society of Plant Biologists

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Articles

A Study of Plastoquinones in Photochemical Reactions in the Chloroplasts of Euglena gracilis Strain Z 1

S. B. Chang2 and T. S. Vedvick

Department of Chemistry, Western Washington State College, Bellingham, Washington 98225

Plastoquinone-9 (PQ-9) was isolated from the chloroplasts of Euglena gracilis Strain Z and spinach. The functional involvement and the structural specificity of PQ-9 in photochemical reactions was investigated in the isolated chloroplasts of Euglena gracilis. It was found that PQ-9 was required for both photoreduction of ferricyanide and photosynthetic phosphorylation in Euglena chloroplasts. The structural integrity of PQ-9 was not required to the same degree in the 2 photochemical reactions. Photosynthetic phosphorylation seemed to require the entire molecular structure of PQ-9 for the activity, whereas shortening in isoprenoid chain and modification of quinoid nucleus of PQ-9 do not seem to alter the photoreduction activity significantly. Addition of PQ-9 to the lyophilized Euglena chloroplasts inhibited the photoreduction of ferricyanide significantly, while it stimulated photosynthetic phosphorylation activity.

2 To whom all the communications to be addressed.

1 This work was supported by a grant from NSF (GB-4574).






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Copyright © 1968 by the American Society of Plant Biologists