Cyanobacterial-Plant Symbioses

Adams, David G.; Bergman, Birgitta; Nierzwicki‐Bauer, Sandra A.; Duggan, Paula S.; Amar, N.; Schüßler, Arthur

doi:10.1007/978-3-642-30194-0_17

Cited by 49 publications

(82 citation statements)

References 270 publications

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“…In the diazotrophic cyanobacterium Synechocystis, neither psbH nor psbK were essential to photoautotrophic growth, but the loss of either resulted in reduced growth rates (Ikeuchi et al, 1991;Mayes et al, 1993). The PS-II transcript differences may reflect the morphological difference between Richelia and Trichodesmium, or indicate the Hemiaulus symbiont has reduced growth rates, as seen with heterocyst-forming cyanobacteria in other associations (Peters and Meeks, 1989;Adams et al, 2006). It is also possible that Richelia is better protected from photodamage within the diatom, resulting in a lower PS-II protein turnover rate, and thus reduced PS-II gene expression relative to free-living oceanic cyanobacteria.…”

Section: Discussionmentioning

confidence: 99%

Metatranscriptomics of N2-fixing cyanobacteria in the Amazon River plume

et al. 2014

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Biological N 2 fixation is an important nitrogen source for surface ocean microbial communities. However, nearly all information on the diversity and gene expression of organisms responsible for oceanic N 2 fixation in the environment has come from targeted approaches that assay only a small number of genes and organisms. Using genomes of diazotrophic cyanobacteria to extract reads from extensive meta-genomic and -transcriptomic libraries, we examined diazotroph diversity and gene expression from the Amazon River plume, an area characterized by salinity and nutrient gradients. Diazotroph genome and transcript sequences were most abundant in the transitional waters compared with lower salinity or oceanic water masses. We were able to distinguish two genetically divergent phylotypes within the Hemiaulus-associated Richelia sequences, which were the most abundant diazotroph sequences in the data set. Photosystem (PS)-II transcripts in Richelia populations were much less abundant than those in Trichodesmium, and transcripts from several Richelia PS-II genes were absent, indicating a prominent role for cyclic electron transport in Richelia. In addition, there were several abundant regulatory transcripts, including one that targets a gene involved in PS-I cyclic electron transport in Richelia. High sequence coverage of the Richelia transcripts, as well as those from Trichodesmium populations, allowed us to identify expressed regions of the genomes that had been overlooked by genome annotations. High-coverage genomic and transcription analysis enabled the characterization of distinct phylotypes within diazotrophic populations, revealed a distinction in a core process between dominant populations and provided evidence for a prominent role for noncoding RNAs in microbial communities.

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Section: Discussionmentioning

confidence: 99%

Metatranscriptomics of N2-fixing cyanobacteria in the Amazon River plume

et al. 2014

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“…The vegetative cells may be enlarged and show irregularities of shape. The rate of CO 2 fixation tends to be reduced, whereas N 2 fixation is stimulated and ammonium assimilation downregulated (Adams and Duggan 2008;Adams et al 2013). In plant symbioses and some cyanolichens, the frequency of heterocysts increases, often reaching 30-40 %, which is several times higher than that typically found in free-living Nostoc (Meeks and Elhai 2002).…”

Section: Cyanobacterial Adaptations To Symbiosismentioning

confidence: 97%

“…They differentiate in response to a range of signals, including the still uncharacterized hormogonium-inducing factor (HIF) that is released by plants under nitrogen starvation (Campbell and Meeks 1989;Nilsson et al 2006). For more on the role and mechanisms of cyanobacterial motility in plant infection, see Adams and Duggan (2008) and Adams et al (2013).…”

Section: Cyanobacterial Adaptations To Symbiosismentioning

confidence: 99%

“…Splitt and Risser (2016) found that plant-derived sucrose or sucrose analogs can both repress hormogonia and induce the production of a polysaccharide sheath that seems to play a role in the establishment and maintenance of the symbiotic state in Nostoc. The signaling between the plant and the cyanobiont may also involve arabinogalactan proteins (Jackson et al 2012;Adams et al 2013).…”

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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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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“…Simbioses epibióticas ou endobióticas entre cianobactérias e eucariotos como animais (ascídios, vermes equiurídeos, larvas de nematóceros, esponjas), cromalveolados (diatomáceas, dinoflagelados), fungos (líquens, Geosiphon) e plantas (antocerotófitas, cicadófitas, hepáticas, musgos, Azolla, Gunnera) são bem documentadas (ADAMS, 2000;ADAMS et al, 2013).…”

Section: Associações Ecológicas Entre Cianobactérias E Outros Organismosunclassified

Análise genômica e funcional da cianobactéria Nostoc sp. CENA67 e caracterização da sua comunidade microbiana associada

Alvarenga¹

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Cyanobacterial-Plant Symbioses

Cited by 49 publications

References 270 publications

Metatranscriptomics of N2-fixing cyanobacteria in the Amazon River plume

Metatranscriptomics of N2-fixing cyanobacteria in the Amazon River plume

Cyanobacteria in Terrestrial Symbiotic Systems

Análise genômica e funcional da cianobactéria Nostoc sp. CENA67 e caracterização da sua comunidade microbiana associada

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