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Effects of Sulphur Dioxide and Fluoride on Ascospore Germination of Several Lichens

Published online by Cambridge University Press:  28 March 2007

G. Belandria ,
J. Asta  and
F. Nurit
G. Belandria
Affiliation:
Laboratoire de Biologie végétale, Université I de Grenoble, BP 68, 38 402 Saint Martin d'Heres cedex, France.
J. Asta
Affiliation:
Laboratoire de Biologie végétale, Université I de Grenoble, BP 68, 38 402 Saint Martin d'Heres cedex, France.
F. Nurit
Affiliation:
Laboratoire de Physiologie cellulaire végétale, Université I de Grenoble, BP 68, 38 402 Saint Martin d'Heres cedex, France.
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Abstract

The effects of fluoride and sulphur dioxide on the germination of ascospores of Lecanora conizaeoides, Xanthoria parietina, Physconia distorta and Peltigera canina were studied under controlled conditions. The two pollutants (H2SO3 and NaF) were dissolved in the culture medium. An improved culture technique permitted a high percentage germination (90° 0) of P. canina spores. Peltigera canina spores had the highest sensitivity to SO2 (no germination at 500 UM H2SO3). Lecanora conizaeoides spores were almost insensitive to each of the two studied pollutants (30°0 spore germination at 1000 UM H2SO3 or NaF). However, simultaneous exposure to 1000 UM H2SO3 and 1000 UM NaF resulted in no germination, indicating a synergistic effect of these products.

Type
Research Article
Information
The Lichenologist , Volume 21 , Issue 1 , January 1989 , pp. 79 - 86
Copyright
Copyright © British Lichen Society 1989

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