POTASSIUM EFFLUX BY LICHEN THALLI FOLLOWING EXPOSURE TO AQUEOUS SULPHUR DIOXIDE * | Zendy

PUCKETT K. J. | Zendy; TOMASSINI F. D. | Zendy; NIEBOERJ E. | Zendy; RICHARDSON D. H. S. | Zendy

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POTASSIUM EFFLUX BY LICHEN THALLI FOLLOWING EXPOSURE TO AQUEOUS SULPHUR DIOXIDE *

Author(s) -

PUCKETT K. J.,

TOMASSINI F. D.,

NIEBOERJ E.,

RICHARDSON D. H. S.

Publication year - 1977

Publication title -

new phytologist

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.742

H-Index - 244

eISSN - 1469-8137

pISSN - 0028-646X

DOI - 10.1111/j.1469-8137.1977.tb02189.x

Subject(s) - efflux , thallus , potassium , lichen , chemistry , kinetics , photosynthesis , biophysics , environmental chemistry , botany , biology , biochemistry , physics , organic chemistry , quantum mechanics

Summary Potassium efflux is a useful experimental quantity for assessing damage to lichens exposed to SO 2 . This SO 2 ‐induced K + efflux is biphasic in response to increasing concentrations of aqueous SO 2 . The first phase can be extrapolated to identify the SO 2 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 14 C‐fixation rates. The magnitude of the SO 2 ‐induced K + efflux indicated that release occurred from intra‐cellular sources. The kinetics of the release process and the effects of SO 2 on membrane integrity are discussed.

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