Molecular evidence for the antiquity of group I introns inter-rupting transfer RNA genes in cyanobacteria

Fewer, David P.

doi:10.53846/goediss-3490

DOI: 10.53846/goediss-3490

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Molecular evidence for the antiquity of group I introns inter-rupting transfer RNA genes in cyanobacteria

David P. Fewer¹

Abstract: Phylogenetic analyses does not support the horizontal transfer of a group I intron fromα-proteobacteria to cyanobacteria.

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Genetic diversity in cyanobacterial symbionts of thalloid bryophytes

Rikkinen

Virtanen

2008

Journal of Experimental Botany

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Two species of thalloid liverworts, Blasia pusilla and Cavicularia densa, form stable symbioses with nitrogen-fixing cyanobacteria. Both bryophytes promote the persistence of their cyanobacterial associations by producing specialized gemmae, which facilitate the simultaneous dispersal of the host and its nitrogen-fixing symbionts. Here the genetic diversity of cyanobacterial symbionts of Blasia and Cavicularia is examined. The results indicate that the primary symbionts of both bryophytes are closely related and belong to a specific group of symbiotic Nostoc strains. Related strains have previously been reported from hornworts and cycads, and from many terricolous cyanolichens. The evolutionary origins of all these symbioses may trace back to pre-Permian times. While the laboratory strain Nostoc punctiforme PCC 73102 has been widely used in experimental studies of bryophyte-Nostoc associations, sequence-identical cyanobionts have not yet been identified from thalloid liverworts in the field.

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Genetic diversity in cyanobacterial symbionts of thalloid bryophytes

Rikkinen

Virtanen

2008

Journal of Experimental Botany

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Molecular evidence for the antiquity of group I introns inter-rupting transfer RNA genes in cyanobacteria

Abstract: Phylogenetic analyses does not support the horizontal transfer of a group I intron fromα-proteobacteria to cyanobacteria.

Cited by 1 publication

References 207 publications

Genetic diversity in cyanobacterial symbionts of thalloid bryophytes

Genetic diversity in cyanobacterial symbionts of thalloid bryophytes

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