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Plant Physiology 50:161-165 (1972)
© 1972 American Society of Plant Biologists

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Biochemical and Biophysical Characteristics of a Photosynthetic Mutant of Euglena gracilis Blocked in Photosystem II 1,2

Faye D. Schwelitz3, R. A. Dilley and F. L. Crane

Charles F. Kettering Research Laboratory, Yellow Springs, Ohio 45387, Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907

A photosynthetic mutant of Euglena gracilis, Z strain, thought to be blocked in the electron transport chain between the two photosystems and to have a missing or nonfunctional primary acceptor for photosystem II, was further studied and characterized. The data from low temperature fluorescence spectra, delayed light emission, and electron paramagnetic resonance support the previous work.

The mutant was shown to lack plastoquinone A and possibly cytochrome b559 but to possess plastoquinone B and a higher complement of carotenoids, especially xanthophylls, than the wild type.

The results are consistent with the postulated role of plastoquinone as the primary electron acceptor for photosystem II and as responsible for the electron paramagnetic resonance signal II. The abundance of xanthophylls in the mutant can be explained by the protective role of carotenoids against photosensitized reactions.

3 Present address: Department of Biology, University of Dayton, Dayton, Ohio 45409.

1 This work was supported in part by National Institutes of Health Training Grant 5T1-GM 1195 (F.D.S.) and National Science Foundation Grant GB-8462 (R.A.D.)

2 Contribution No. 457 from the Charles F. Kettering Research Laboratory, Yellow Springs, Ohio.






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Copyright © 1972 by the American Society of Plant Biologists