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Applied and Environmental Microbiology, September 2001, p. 4393-4396, Vol. 67, No. 9
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.9.4393-4396.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Genetic Diversity of Nostoc Symbionts Endophytically Associated with Two Bryophyte Species

José-Luis Costa,1,* Per Paulsrud,1 Jouko Rikkinen,2 and Peter Lindblad1

Department of Physiological Botany, Evolutionary Biology Centre, Uppsala University, SE-752 36 Uppsala, Sweden,1 and Department of Applied Biology, Botany, FIN-00014 University of Helsinki, Finland2

Received 19 March 2001/Accepted 27 May 2001

The diversity of the endophytic Nostoc symbionts of two thalloid bryophytes, the hornwort Anthoceros fusiformis and the liverwort Blasia pusilla, was examined using the tRNALeu (UAA) intron sequence as a marker. The results confirmed that many different Nostoc strains are involved in both associations under natural conditions in the field. The level of Nostoc diversity within individual bryophyte thalli varied, but single DNA fragments were consistently amplified from individual symbiotic colonies. Some Nostoc strains were widespread and were detected from thalli collected from different field sites and different years. These findings indicate a moderate level of spatial and temporal continuity in bryophyte-Nostoc symbioses.

* Corresponding author. Mailing address: Department of Physiological Botany, Evolutionary Biology Centre, Uppsala University, Villavägen 6, SE-752 36 Uppsala, Sweden. Phone: 46 18 471 28 14. Fax: 46 18 471 28 26. E-mail: jose.costa{at}ebc.uu.se.

Applied and Environmental Microbiology, September 2001, p. 4393-4396, Vol. 67, No. 9
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.9.4393-4396.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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