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Molecular analysis of AMF diversity in aquatic macrophytes : a comparison of oligotrophic and utra-oligotrophic lakes

Baar, J. and Paradi, I. and Lucassen, Echet and Hudson-Edwards, K. A. and Redecker, D. and Roelofs, J. G. M. and Smolders, A. J. P.. (2011) Molecular analysis of AMF diversity in aquatic macrophytes : a comparison of oligotrophic and utra-oligotrophic lakes. Aquatic botany, Vol. 94, H. 2. pp. 53-61.

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Official URL: http://edoc.unibas.ch/dok/A6001910

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Abstract

This study aimed to assess AMF diversity in various plant species in lakes with low and relatively high P concentrations to elucidate possible correlations with environmental factors in order for better understanding the functioning of mycorrhizal fungi in submerged plants. A considerable diversity of AMF communities was observed in the lakes with low dissolved P concentrations, especially in the roots of Littorella uniflora. Glomus group A, Archaeospora and Acaulospora were the most frequent and diverse AMF lineages with eight, seven and four phylotypes at Littorella uniflora in at least six lakes with low dissolved P concentrations. In theses lakes, AMF were for the first time observed in the roots of J. bulbosus, a member of a family previously thought to be non-mycorrhizal. In the lakes with relatively high dissolved P concentrations, the frequency decreased from Acaulospora, found at three locations, to Archaeospora at two locations and Glomus group A and Paraglomus at one location. All chemical parameters of the surface water layer, except pH, revealed significant (p >= 0.01) differences between the lakes with low and relatively high dissolved P concentrations. Mean Mg(2+), Ca(2+), K(+), NH(4)(+), CO(2). o-PO(4)(3-) and HCO(3)(-) were 3, 13.5, 15.7, 19.5, 31 and 42.6 times higher, respectively, in the lakes with relatively high dissolved P concentrations compared to the lakes with low dissolved P concentrations. AMF occurred more abundantly with low phosphate and high redox values in the lakes than with high phosphate and low redox values. The pH-value, the total-calcium and total-phosphorus concentrations were strongly correlated with the occurrence of Glomus phylotypes 4 and Archaeospora phylotypes 5 and 8, and a bit less with Acaulospora phylotype 4 and Archaeospora phylotype 3. In such lakes the presence of a diverse AMF community still enables the uptake of sufficient P for isoetid plant species despite the prevailing 'ultra-oligotrophic' conditions. As a consequence, macrophyte plant communities in lakes with relatively high dissolved P concentrations are less dependent on AMF colonization for their development. (C) 2010 Elsevier B.V. All rights reserved.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Pflanzenphysiologie Zuckermetabolismus (Wiemken)
UniBasel Contributors:Redecker, Dirk
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier
ISSN:0304-3770
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:08 Nov 2012 16:22
Deposited On:08 Nov 2012 16:13

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