Genetic diversity in cyanobacterial symbionts of thalloid bryophytes

Rikkinen, Jouko; Virtanen, Viivi

doi:10.1093/jxb/ern003

Cited by 31 publications

(28 citation statements)

References 40 publications

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“…On the other hand, some lichenforming fungi are known to associate with many different cyanobiont genotypes and frequently share them with other fungal species O'Brien et al 2013;Magain and Sérusiaux 2014;see Rikkinen 2013 for recent review). Bryophytes and cycads do not seem to be quite as selective in their cyanobiont choice and can often associate with several different Nostoc genotypes (Rikkinen and Virtanen 2008;Gehringer et al 2010;Yamada et al 2012).…”

Section: Figmentioning

confidence: 99%

“…Vertical transmission of cyanobionts from one host generation to the next has evolved independently in many different lineages of cyanolichens (Rikkinen 2002), in thalloid liverworts (Rikkinen and Virtanen 2008), and in the cyanobacteriumAzolla symbiosis (Adams et al 2013). The production of specialized symbiotic propagules helps to maintain pairwise symbiotic interactions over time and promotes the likelihood of coevolution between specific partners.…”

Section: Cyanobacterial Adaptations To Symbiosismentioning

confidence: 99%

“…The cyanobionts are usually Nostoc, although also other cyanobacterial genera have been mentioned as symbionts of some bryophyte species (West and Adams 1997;Costa et al 2001;Rikkinen and Virtanen 2008).…”

Section: Bryophyte-cyanobacterium Symbiosesmentioning

confidence: 99%

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Cyanobacteria in Terrestrial Symbiotic Systems

Rikkinen

2017

Modern Topics in the Phototrophic Prokaryotes

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Filamentous cyanobacteria are important primary producers and N 2 fixers in many terrestrial environments. As reduced nitrogen is often limiting, some thalloid liverworts (Marchantiophyta), hornworts (Anthocerophyta), the water fern Azolla (Salviniales), cycads (Cycadophyta), and the angiosperm Gunnera (Gunnerales) have evolved the ability to establish stable and structurally welldefined symbioses with N 2 -fixing cyanobacteria. Also a wide diversity of lichenforming fungi have cyanobacteria as photosynthetic symbionts or as N 2 -fixing symbionts. Cyanolichen symbioses have evolved independently in different fungal lineages, and evolution has often resulted in convergent morphologies in distantly related groups. DNA techniques have provided a wealth of new information on the diversity of symbiotic cyanobacteria and their hosts. The fact that many plants and fungi engage in many different symbioses simultaneously underlines the probable significance of diffuse evolutionary relationships between different symbiotic systems, including cyanobacterial and mycorrhizal associations. This review introduces the reader to recent research on symbiotic cyanobacteria in terrestrial ecosystems and shortly describes the astonishing range of diversity in these ecologically important associations.

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Section: Figmentioning

confidence: 99%

Section: Cyanobacterial Adaptations To Symbiosismentioning

confidence: 99%

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Cyanobacteria in Terrestrial Symbiotic Systems

Rikkinen

2017

Modern Topics in the Phototrophic Prokaryotes

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“…would be linked to the intensive hormogonia production that was observed in many of the strains studied. Rikkinen and Virtanen (2008) returned to Nostoc diversity in thalloid liverworts by identifying cyanobacteria associated with Blasia pusilla (Fig. 6A) in Finland and Cavicularia densa in Japan.…”

Section: From Single Thalli To Global Distribution Patternsmentioning

confidence: 99%

“…The few studies in which cyanobacteria have been cultured from bark and soil have generally revealed high diversity in the substrate (e.g. Rikkinen et al 2002, Rikkinen andVirtanen 2008). However, the possible connections between free-living cyanobacteria and their lichen symbiotic relatives remain unknown.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Molecular studies on cyanobacterial diversity in lichen symbioses

Rikkinen¹

2013

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Citation: Rikkinen J (2013) Molecular studies on cyanobacterial diversity in lichen symbioses. In: Boonpragob K, Crittenden P, Lumbsch HT (Eds) Lichens: from genome to ecosystems in a changing world. MycoKeys 6: 3-32. doi:10.3897/mycokeys.6.3869 AbstractSymbioses between cyanobacteria and lichen-forming fungi occur worldwide in a wide range of terrestrial environments, ranging from tropical rainforests to hot and cold deserts. The evolutionary success of these symbioses is evident from the wide range of fungal groups that have established associations with cyanobacteria. The diversity of symbiotic cyanobacteria is also high, and it is obvious that symbioses between different cyanobacteria and different lichen-forming fungi have evolved on multiple occasions. From the late 1990s cyanobacterial lichens have been the subject of a steadily increasing number of molecular investigations. This chronological review examines how these studies have contributed to present knowledge and highlights some conceptual developments that have been instrumental in the process.

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The diversity and community structure of symbiotic cyanobacteria in hornworts inferred from long‐read amplicon sequencing

Nelson

Hauser

2021

American J of Botany

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Premise: Nitrogen-fixing endosymbioses with cyanobacteria have evolved independently in five very different plant lineages. Expanding knowledge of these symbioses promises to improve the understanding of symbiosis evolution and broaden the toolkit for agricultural engineering to reduce artificial fertilizer use. Here we focused on hornworts, a bryophyte lineage in which all members host cyanobacteria, and investigated factors shaping the diversity of their cyanobiont communities. Methods: We sampled hornworts and adjacent soils in upstate New York throughout the hornwort growing season. We included all three sympatric hornwort species in the area, allowing us to directly compare partner selectivity. To profile cyanobacteria communities, we established a metabarcoding protocol targeting rbcL-X with PacBio long reads. Results: The hornwort cyanobionts detected were phylogenetically diverse, including clades that do not contain other known plant symbionts. We found significant overlap between hornwort cyanobionts and soil cyanobacteria, a pattern not previously reported in other plant-cyanobacteria symbioses. Cyanobiont communities differed between host plants only centimeters apart, but we did not detect an effect of sampling time or host species on the cyanobacterial community structure. Conclusions: This study expands the phylogenetic diversity of known symbiotic cyanobacteria. Our analyses suggest that hornwort cyanobionts have a tight connection to the soil background, and we found no evidence that time within growing season, host species, or distance at the scale of meters strongly govern cyanobacteria community assembly. This study provides a critical foundation for further study of the ecology, evolution, and interaction dynamics of plant-cyanobacteria symbiosis.

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Genetic diversity in cyanobacterial symbionts of thalloid bryophytes

Cited by 31 publications

References 40 publications

Cyanobacteria in Terrestrial Symbiotic Systems

Cyanobacteria in Terrestrial Symbiotic Systems

Molecular studies on cyanobacterial diversity in lichen symbioses

The diversity and community structure of symbiotic cyanobacteria in hornworts inferred from long‐read amplicon sequencing

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