Document Detail


Comparison of the phytotoxic effects of usnic acid on cultures of free-living alga Scenedesmus quadricauda and aposymbiotically grown lichen photobiont Trebouxia erici.
MedLine Citation:
PMID:  20306219     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The phytotoxic effects of the lichen secondary metabolite-usnic acid on cultures of free living alga-Scenedesmus quadricauda (UTEX 76) and aposymbiotically grown lichen photobiont Trebouxia erici (UTEX 911) were assessed. We found a relatively strong inhibition effect of usnic acid on the growth of alga Scenedesmus, accompanied by an increase of cell size, an alteration of assimilation pigment composition, followed by strong degradation of chlorophyll a, a decrease of chlorophyll a fluorescence, and an increase of reactive oxygen species in the cells. The content of soluble proteins remained a stable parameter. Phytotoxicity of usnic acid on cultures of Trebouxia photobiont was significantly lower. Usnic acid in lichens may act as an allochemical that controls the division of photobiont cells, thereby regulating the balance between the photobiont and mycobiont forming thallus. Higher tolerance to usnic acid in Trebouxia cultures may be an adaptation resulting from the long term co-evolution of these algae with fungi that produce secondary metabolites.
Authors:
Martin Backor; Katarína Klemová; Miriam Backorová; Veneta Ivanova
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-20
Journal Detail:
Title:  Journal of chemical ecology     Volume:  36     ISSN:  1573-1561     ISO Abbreviation:  J. Chem. Ecol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-07     Completed Date:  2010-07-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7505563     Medline TA:  J Chem Ecol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  405-11     Citation Subset:  IM    
Affiliation:
Department of Botany, Institute of Biology and Ecology, Faculty of Science, Safárik University, Kosice, Slovak Republic. martin.backor@upjs.sk
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MeSH Terms
Descriptor/Qualifier:
Anti-Infective Agents / toxicity*
Benzofurans / toxicity*
Evolution
Lichens / drug effects*
Scenedesmus / drug effects*
Symbiosis
Chemical
Reg. No./Substance:
0/Anti-Infective Agents; 0/Benzofurans; 125-46-2/usnic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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