POTASSIUM EFFLUX BY LICHEN THALLI FOLLOWING EXPOSURE TO AQUEOUS SULPHUR DIOXIDE.
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| Title: | POTASSIUM EFFLUX BY LICHEN THALLI FOLLOWING EXPOSURE TO AQUEOUS SULPHUR DIOXIDE. |
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| Authors: | Puckett, K. J.1, Tomassini, F. D.2, Nieboer, E.2, Richardson, D. H. S.2 |
| Source: | New Phytologist. Jul77, Vol. 79 Issue 1, p135-145. 11p. |
| Subjects: | Potassium, Lichens, Sulfur dioxide, Biological membranes, Tissue fixation (Histology), Photosynthesis |
| Abstract: | Potassium efflux is a useful experimental quantity for assessing damage to lichens exposed to SO2. This SO2--induced K+ efflux is biphasic in response to increasing concentrations of aqueous SO2. The first phase can be extrapolated to identify the SO2 concentration at which no K+ release occurred above the control values. This threshold concentration was used to determine the relative sensitivities of various lichen species. Good agreement was observed between the total K+ lost and the reduction in the total photosynthetic 14C-fixation rates. The magnitude of the SO2--induced K+ efflux indicated that release occurred from intracellular sources. The kinetics of the release process and the effects of SO2 on membrane integrity are discussed. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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