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.
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机译：使用tRNA Leu （UAA）内含子序列作为标记，检查了两个拟南芥苔藓类植物苔藓类和苔藓类Bulasia pusilla的内生Nostoc共生体的多样性。结果证实，在田间自然条件下，两种不同的Nostoc菌株都参与了这两种关联。单个苔藓植物藻内的Nostoc多样性水平各不相同，但单个DNA片段始终从单个共生菌落中扩增出来。一些Nostoc菌株很普遍，并且是从不同田间地点和不同年份收集的塔利中检出的。这些发现表明，苔藓-Nostoc共生菌具有适度的空间和时间连续性。
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