Curling during desiccation protects the foliose lichen Lobaria pulmonaria against photoinhibition. | |
MedLine Citation:
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PMID: 16804701 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study aims to assess the photoprotective potential of desiccation-induced curling in the light-susceptible old forest lichen Lobaria pulmonaria by using chlorophyll fluorescence imaging. Naturally curled thalli showed less photoinhibition-induced limitations in primary processes of photosynthesis than artificially flattened specimens during exposures to 450 micromol m-2 s-1 in the laboratory after both 12- (medium dose treatment) and 62-h duration (high dose treatment). Thallus areas shaded by curled lobes during light exposure showed unchanged values of measured chlorophyll fluorescence parameters (FV/FM, PhiPS II), whereas non-shaded parts of curled thalli, as well as the mean for the entire flattened thalli, showed photoinhibitory limitation after light treatments. Furthermore, the chlorophyll fluorescence imaging showed that the typical small-scale reticulated ridges on the upper side of L. pulmonaria caused a spatial, small-scale reduction in damage due to minor shading. Severe dry-state photoinhibition readily occurred in flattened and light-treated L. pulmonaria, although the mechanisms for such damage in a desiccated and inactive stage are not well known. Natural curling is one strategy to reduce the chance for serious photoinhibition in desiccated L. pulmonaria thalli during high light exposures. |
Authors:
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Milos Barták; Knut Asbjørn Solhaug; Hana Vráblíková; Yngvar Gauslaa |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2006-06-28 |
Journal Detail:
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Title: Oecologia Volume: 149 ISSN: 0029-8549 ISO Abbreviation: Oecologia Publication Date: 2006 Oct |
Date Detail:
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Created Date: 2006-09-21 Completed Date: 2006-12-15 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0150372 Medline TA: Oecologia Country: Germany |
Other Details:
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Languages: eng Pagination: 553-60 Citation Subset: IM |
Affiliation:
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Department of Plant Physiology and Anatomy, Masaryk University, Kotlarska 2, 61137, Brno, Czech Republic. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
MeSH Terms | |
Descriptor/Qualifier:
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Chlorophyll
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physiology Desiccation Fluorescence Lichens / physiology* Light* Photosynthesis / physiology* Water / physiology |
Chemical | |
Reg. No./Substance:
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1406-65-1/Chlorophyll; 7732-18-5/Water |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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