Document Detail

Colony induction and growth inhibition in Desmodesmus quadrispina (Chlorococcales) by allelochemicals released from the filamentous alga Uronema confervicolum (Ulotrichales).
MedLine Citation:
PMID:  18312391     Owner:  NLM     Status:  MEDLINE    
In biofilms, the competition between microorganisms for light, nutrients and space is extreme. Moreover, planktonic algae can be considered as competitors insofar as they decrease the available light for the benthic algae. One of the strategies employed by microorganisms to eliminate competitors is the release of inhibiting compounds, a process known as allelopathy. Here we demonstrate that a benthic/epiphytic alga, Uronema confervicolum, produces allelopathic compounds that induce oxidative stress and growth inhibition in the planktonic Desmodesmus quadrispina. Some of these compounds can also trigger the formation of colony in D. quadrispina. As colonies have higher sedimentation rates than unicells, their induction by U. confervicolum might decrease shading. This study is the first report of colony induction in the context of alga-alga interaction. Our results also suggest the implication of mitogen-activated protein (MAP) kinases in the transduction of the signal leading to the formation of reactive oxygen species in the cells. A comparison with allelochemicals from another planktonic green alga, Monoraphidium aff. dybowski, emphasizes the specificity of colony induction by U. confervicolum, in contrast with oxidative stress which is induced by several compounds. The reciprocal production of inhibiting compounds by D. quadrispina makes this interaction an interesting example of co-evolution between two microorganisms belonging to different compartments of the ecosystem.
Joséphine Leflaive; Gérard Lacroix; Yvan Nicaise; Loïc Ten-Hage
Publication Detail:
Type:  Journal Article     Date:  2008-02-27
Journal Detail:
Title:  Environmental microbiology     Volume:  10     ISSN:  1462-2920     ISO Abbreviation:  Environ. Microbiol.     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-05-13     Completed Date:  2008-06-13     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  100883692     Medline TA:  Environ Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1536-46     Citation Subset:  IM    
Laboratoire d'Ecologie Fonctionnelle (EcoLab), UMR 5245 (CNRS, UPS, INPT) Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex 09, France.
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MeSH Terms
Algae, Green / drug effects*,  growth & development,  metabolism*
Mitogen-Activated Protein Kinases / metabolism
Oxidative Stress
Pheromones / metabolism*
Reactive Oxygen Species / metabolism
Reg. No./Substance:
0/Pheromones; 0/Reactive Oxygen Species; EC Protein Kinases

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