Plant Physiol. Drug Metab Dispos
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Plant Physiology 50:166-170 (1972)
© 1972 American Society of Plant Biologists

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Articles

Structural 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

The techniques of thin sectioning and freeze etching were employed in comparing the chloroplast structure of the wild type and photosynthetic mutant P4 of Euglena gracilis, Z strain. The mutant chloroplasts were characterized by a lack of thylakoid pairing even under high salt conditions. In addition the mutant thylakoids were more varied in size and fewer in number than those of the wild type. No differences between the mutant and wild type were observed in the size and distribution of the particles within the chloroplast membranes seen by the freeze-etching technique.

These structural abnormalities do not appear to be correlated per se with the absence of plastoquinone A in the mutant but may be related to a different lipid composition observed in the mutant.

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. 456 from the Charles F. Kettering Research Laboratory, Yellow Springs, Ohio.






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Copyright © 1972 by the American Society of Plant Biologists