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Plant Physiology 46:183-185 (1970)
© 1970 American Society of Plant Biologists

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Articles

Observations on the Mechanism of Copper Damage in Chlorella1

R. E. Gross2, P. Pugno3 and W. M. Dugger

a Department of Life Sciences, University of California, Riverside, California 92502

Addition of excess copper to nongrowing cells of a normal, green Chlorella caused a reduction in total pigments and a blue shift of chlorophyll absorption, concurrent with the inhibition of photosynthesis. Chlorophylless yellow and white mutant strains of the same alga showed a rise in nonspecific absorption (i.e., change in light scatter) within 5 to 10 minutes after the addition of CuSO4; concomitantly a lowering of packed cell volume and a rise in respiration occurred. Glutathione prevented all copper-induced changes, whereas MnCl2 protected only partially. Selective inhibition of some responses to copper was observed when O2 was absent or an antioxidant present.

2 Present address: Purdue University, Indianapolis Campus, Indianapolis, Indiana 46205.

3 United States Public Health Service undergraduate research trainee.

1 This work was supported in part by Grant AP-40 from the National Center for Air Pollution Control, United States Public Health Service.






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Copyright © 1970 by the American Society of Plant Biologists