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Observations on the Mechanism of Copper Damage in Chlorella

R. E. Gross, P. Pugno and W. M. Dugger
Plant Physiology
Vol. 46, No. 2 (Aug., 1970), pp. 183-185
Stable URL: http://www.jstor.org/stable/4262138
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Observations on the Mechanism of Copper Damage in Chlorella
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Abstract

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 non-specific 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.

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