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Plant Physiology 56:723-727 (1975)
© 1975 American Society of Plant Biologists

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Articles

Ozone-induced Loss of Intracellular Potassium Ion from Chlorella sorokiniana1,2

Phrosene E. Chimiklisa,3 and Robert L. Heathb

a Department of Biology, University of California, Riverside, California 92502, Department of Biochemistry, University of California, Riverside, California 92502

The unicellular algae Chlorella sorokiniana was used as a model system to investigate the interaction of ozone with plant cell membranes. Ozone induces K+ leakage from Chlorella sorokiniana similar to the electrolytic loss observed from many higher plants under stressful conditions. The kinetics of this leakage indicate that ozone initially interacts reversibly (within sec) with sites on membranes allowing a passive efflux of K+. This efflux ceases within minutes after the ozone stress is removed. This return to normal efflux is very temperature dependent. High intracellular osmolarity seems to be an important criterion of susceptibility to ozone injury in this model system, since rates of ozone-induced K+ leakage are less when the external osmotic potential is decreased by suspension of the cells in mannitol. Cell interaction with ozone is further complicated by a saturating-type dependence of the K+ efflux upon ozone concentration within the medium.

3 Present address: National Ecological Research Laboratory, United States Environmental Protection Agency, Corvallis, Ore.

1 This project has been financed in part with federal funds from the Environmental Protection Agency under Grant R-801311.

2 The contents of this paper do not necessarily reflect the views and policies of the Environmental Protection Agency.






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Copyright © 1975 by the American Society of Plant Biologists