Document Detail

Curling during desiccation protects the foliose lichen Lobaria pulmonaria against photoinhibition.
MedLine Citation:
PMID:  16804701     Owner:  NLM     Status:  MEDLINE    
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.
Milos Barták; Knut Asbjørn Solhaug; Hana Vráblíková; Yngvar Gauslaa
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-06-28
Journal Detail:
Title:  Oecologia     Volume:  149     ISSN:  0029-8549     ISO Abbreviation:  Oecologia     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-09-21     Completed Date:  2006-12-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0150372     Medline TA:  Oecologia     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  553-60     Citation Subset:  IM    
Department of Plant Physiology and Anatomy, Masaryk University, Kotlarska 2, 61137, Brno, Czech Republic.
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MeSH Terms
Chlorophyll / physiology
Lichens / physiology*
Photosynthesis / physiology*
Water / physiology
Reg. No./Substance:
1406-65-1/Chlorophyll; 7732-18-5/Water

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