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The relation of H2S release to SO2 fumigation of lichens

Published online by Cambridge University Press:  01 August 1997

CORINNA GRIES
Affiliation:
Department of Botany, Arizona State University, Tempe, AZ 85287-1601, USA
JOANNE G. ROMAGNI
Affiliation:
Department of Botany, Arizona State University, Tempe, AZ 85287-1601, USA
THOMAS H. NASH III
Affiliation:
Department of Botany, Arizona State University, Tempe, AZ 85287-1601, USA
UWE KUHN
Affiliation:
Max Planck Institute für Chemie, Abt. Biogeochemie, Box 3060, D-55020 Mainz, Germany
JÜRGEN KESSELMEIER
Affiliation:
Max Planck Institute für Chemie, Abt. Biogeochemie, Box 3060, D-55020 Mainz, Germany
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Abstract

Hydrogen sulphide emission in lichens as a response to low concentration SO2 fumigation was investigated. In an open flow-through system several lichen species were fumigated with 36 ppb SO2. Two species were also fumigated with higher concentrations (72, 119, 122 and 198 ppb SO2). Hydrogen sulphide emission was monitored concurrently by cryogenic trapping and analysis with gas chromatography. All tested species increased H2S emission significantly in response to fumigation with 36 ppb SO2. Parmelina tiliacea (L.) Hale and Cladina rangiferina (L.) Wigg. released significantly more H2S (0·098±0·015 and 0·073±0·013 pmol H2S g−1 d. wt s−1, respectively) than Parmelina quercina (Ach.) Hale, Ramalina menziesii Tayl. and Parmelia sulcata Tayl. (0·028±0·01, 0·025±0·014 and 0·023±0·013 pmol H2S g−1 d. wt s−1, respectively). Release of H2S in Hypogymnia physodes was enhanced by increasing SO2 concentrations up to 72 ppb SO2. No significant difference in H2S emission in the dark vs. in the light was found. Generally, no correlation was found between photosynthetic activity and H2S emission for the tested species. Uptake of SO2 was similar for all species, at 24·7±5·6 pmol SO2 g−1 d. wt s−1 in 36 ppb SO2 and increasing at greater SO2 concentrations. Therefore, H2S-S release represents only 0·11–0·74% of SO2-S uptake.

Type
Research Article
Copyright
© Trustees of the New Phytologist 1997

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