title: Genetic diversity of Nostoc symbionts endophytically associated with two bryophyte species.
abstract: The diversity of the endophytic Nostoc symbionts of two thalloid bryophytes, the hornwort Anthoceros fusiformis and the liverwort Blasia pusilla, was examined using the tRNA(Leu) (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.
authors.affiliation: Department of Physiological Botany, Evolutionary Biology Centre, Uppsala University, SE-752 36 Uppsala, Sweden.
authors.forename: J L
authors.initials: JL
authors.lastname: Costa
authors.forename: P
authors.initials: P
authors.lastname: Paulsrud
authors.forename: J
authors.initials: J
authors.lastname: Rikkinen
authors.forename: P
authors.initials: P
authors.lastname: Lindblad
mesh_terms: D001483:Base Sequence; D000458:Cyanobacteria / Q000145:classification* / Q000235:genetics*; D014644:Genetic Variation; D008969:Molecular Sequence Data; D010944:Plants / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D012346:RNA, Transfer, Amino Acyl / Q000235:genetics*; D017422:Sequence Analysis, DNA; D013559:Symbiosis
chemical_list: D012346:RNA, Transfer, Amino Acyl