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Genomic Changes Associated With the Evolutionary Transitions of Nostoc to a Plant Symtiont
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
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Number of Authors: 112018 (English)In: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 35, no 5, p. 1160-1175Article in journal (Refereed) Published
Abstract [en]

Cyanobacteria belonging to the genus Nostoc comprise free-living strains and also facultative plant symbionts. Symbiotic strains can enter into symbiosis with taxonomically diverse range of host plants. Little is known about genomic changes associated with evolutionary transition of Nostoc from free-living to plant symbiont. Here, we compared the genomes derived from 11 symbiotic Nostoc strains isolated from different host plants and infer phylogenetic relationships between strains. Phylogenetic reconstructions of 89 Nostocales showed that symbiotic Nostoc strains with a broad host range, entering epiphytic and intracellular or extracellular endophytic interactions, form a monophyletic Glade indicating a common evolutionary history. A polyphyletic origin was found for Nostoc strains which enter only extracellular symbioses, and inference of transfer events implied that this trait was likely acquired several times in the evolution of the Nostocales. Symbiotic Nostoc strains showed enriched functions in transport and metabolism of organic sulfur, chemotaxis and motility, as well as the uptake of phosphate, branched-chain amino acids, and ammonium. The genomes of the intracellular Glade differ from that of other Nostoc strains, with a gain/enrichment of genes encoding proteins to generate i-methionine from sulfite and pathways for the degradation of the plant metabolites vanillin and vanillate, and of the macromolecule xylan present in plant cell walls. These compounds could function as C-sources for members of the intracellular Glade. Molecular clock analysis indicated that the intracellular Glade emerged ca. 600 Ma, suggesting that intracellular Nostoc symbioses predate the origin of land plants and the emergence of their extant hosts.

Place, publisher, year, edition, pages
2018. Vol. 35, no 5, p. 1160-1175
Keywords [en]
cyanobacteria, symbiosis, evolution, plant-microbe interaction
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-156607DOI: 10.1093/molbev/msy029ISI: 000431889600011PubMedID: 29554291OAI: oai:DiVA.org:su-156607DiVA, id: diva2:1210446
Available from: 2018-05-28 Created: 2018-05-28 Last updated: 2018-05-28Bibliographically approved

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Warshan, DenisPederson, EricKim, Sea-YongPawlowski, KatharinaRasmussen, Ulla
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