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An Sem Study of Injury Symptoms in Parmotrema Reticulatum Treated With Paraquat or Growing in Sulphur Dioxide-Polluted Air

Published online by Cambridge University Press:  28 March 2007

P. Modenesi
P. Modenesi
Affiliation:
Institute of Botany ‘Hanbury’, University of Genoa, Corso Dogali 1/c, 1-16136 Genoa, Italy.
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Abstract

The effect of Paraquat, a herbicide known to stimulate oxygen-centred free-radical production in green plants, is compared with visible injury symptoms due to air pollution in Parmotrema reticulatum, an SO2-sensitive lichen species. This is in order to verify the hypothesized SO2 toxicity mechanism via the generation of free radicals. A new SEM-visible symptom is described: the production of heavy crystalline deposition on the thallus surface in SO2-stressed and Paraquat-treated specimens. The examination of the crystalline deposition by X-ray diffraction, correlated with SEM studies, showed that it is calcium oxalate (weddellite).

Type
Research Article
Information
The Lichenologist , Volume 25 , Issue 4 , October 1993 , pp. 423 - 433
Copyright
Copyright © British Lichen Society 1993

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