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Applied and Environmental Microbiology, September 2007, p. 5613-5623, Vol. 73, No. 17
0099-2240/07/$08.00+0     doi:10.1128/AEM.00262-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Seasonal Dynamics of Arbuscular Mycorrhizal Fungal Communities in Roots in a Seminatural Grassland{triangledown} ,{dagger}

Juan C. Santos-González,1,2* Roger D. Finlay,2 and Anders Tehler1

Department of Cryptogamic Botany, Swedish Museum of Natural History, P.O. Box 50007, SE-104 05 Stockholm,1 Department of Forest Mycology and Pathology, SLU, P.O. Box 7026, SE-750 07 Uppsala, Sweden2

Received 1 February 2007/ Accepted 3 July 2007

Symbiotic arbuscular mycorrhizal fungi (AMF) have been shown to influence both the diversity and productivity of grassland plant communities. These effects have been postulated to depend on the differential effects of individual mycorrhizal taxa on different plant species; however, so far there are few detailed studies of the dynamics of AMF colonization of different plant species. In this study, we characterized the communities of AMF colonizing the roots of two plant species, Prunella vulgaris and Antennaria dioica, in a Swedish seminatural grassland at different times of the year. The AMF small subunit rRNA genes were subjected to PCR, cloning, sequencing, and phylogenetic analysis. Nineteen discrete sequence types belonging to Glomus groups A and B and to the genus Acaulospora were distinguished. No significant seasonal changes in the species compositions of the AMF communities as a whole were observed. However, the two plant species hosted significantly different AMF communities. P. vulgaris hosted a rich AMF community throughout the entire growing season. The presence of AMF in A. dioica decreased dramatically in autumn, while an increased presence of Ascomycetes species was detected.

* Corresponding author. Mailing address: Department of Cryptogamic Botany, Swedish Museum of Natural History, P.O. Box 50007, SE-104 05 Stockholm, Sweden. Phone: 46-8-51954162. Fax: 46-8-51954221. E-mail: juan.santos{at}nrm.se

{triangledown} Published ahead of print on 13 July 2007.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

Applied and Environmental Microbiology, September 2007, p. 5613-5623, Vol. 73, No. 17
0099-2240/07/$08.00+0     doi:10.1128/AEM.00262-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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