Volume 23, Issue 7 p. 3418-3434
Special Issue Article

Culturomics-based genomics sheds light on the ecology of the new haloarchaeal genus Halosegnis

Ana Durán-Viseras

Ana Durán-Viseras

Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, Sevilla, 41012 Spain

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Adrian-Ştefan Andrei

Adrian-Ştefan Andrei

Department of Aquatic Microbial Ecology, Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences, České Budějovice, 370 05 Czech Republic

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Blanca Vera-Gargallo

Blanca Vera-Gargallo

Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, Sevilla, 41012 Spain

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Rohit Ghai

Rohit Ghai

Department of Aquatic Microbial Ecology, Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences, České Budějovice, 370 05 Czech Republic

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Cristina Sánchez-Porro

Cristina Sánchez-Porro

Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, Sevilla, 41012 Spain

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Antonio Ventosa

Corresponding Author

Antonio Ventosa

Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, Sevilla, 41012 Spain

For correspondence. E-mail [email protected]; Tel. +34 954556765; Fax +34 954628162.Search for more papers by this author
First published: 14 May 2020
Citations: 13

Summary

The development of culture-independent techniques has revolutionized our understanding of microbial ecology, especially through the illustration of the vast gap between the environmentally abundant microbial diversity and that accessible through cultivation. However, culture-based approaches are not only crucial for understanding the evolutionary, metabolic and ecological milieu of microbial diversity but also for the development of novel biotechnological applications. In this study, we used a culturomics-based approach in order to isolate novel microbial taxa from hypersaline environments (i.e. Isla Cristina and Isla Bacuta salterns in Huelva, Spain). We managed to obtain axenic cultures of four haloarchaeal strains that belong to a new haloarchaeal genus and to obtain their genomic sequences. The phylogenomic and phylogenetic analyses (together with AAI, ANI and digital DDH indices) showed that the isolates constitute two new species, for which we propose the names Halosegnis longus sp. nov. and Halosegnis rubeus sp. nov. The genomic-based metabolic reconstructions indicated that members of this new haloarchaeal genus have photoheterotrophic aerobic lifestyle with a typical salt-in signature. 16S rRNA gene sequence reads abundance profiles and genomic recruitment analyses revealed that the Halosegnis genus has a worldwide geographical distribution, reaching high abundance (up to 8%) in habitats with intermediate salinities.