Fellfields of the Kerguelen Islands harbour specific soil microbiomes and rhizomicrobiomes of an endemic plant facing necrosis
Polar regions are characterized by rocky terrains with sparse vegetation and oligotrophic soils, i.e. “fellfields”. In such ecosystems, microbial communities should be essential for soil-plant functioning but their diversity is poorly explored. The sub-Antarctic Kerguelen Islands fellfields are char...
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2022
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Online Access: | https://doi.org/10.3389/fsoil.2022.995716 https://doaj.org/article/a156c9ccdc5340a795b39a28d7a929fc |
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ftdoajarticles:oai:doaj.org/article:a156c9ccdc5340a795b39a28d7a929fc 2023-05-15T13:57:38+02:00 Fellfields of the Kerguelen Islands harbour specific soil microbiomes and rhizomicrobiomes of an endemic plant facing necrosis Lorène Julia Marchand Françoise Hennion Michèle Tarayre Marie-Claire Martin Benoit Renaud Martins Cécile Monard 2022-09-01T00:00:00Z https://doi.org/10.3389/fsoil.2022.995716 https://doaj.org/article/a156c9ccdc5340a795b39a28d7a929fc EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fsoil.2022.995716/full https://doaj.org/toc/2673-8619 2673-8619 doi:10.3389/fsoil.2022.995716 https://doaj.org/article/a156c9ccdc5340a795b39a28d7a929fc Frontiers in Soil Science, Vol 2 (2022) sub-Antarctic bacteria fungi Lyallia kerguelensis cushion plant dieback Chemistry QD1-999 Engineering geology. Rock mechanics. Soil mechanics. Underground construction TA703-712 article 2022 ftdoajarticles https://doi.org/10.3389/fsoil.2022.995716 2022-12-30T21:06:36Z Polar regions are characterized by rocky terrains with sparse vegetation and oligotrophic soils, i.e. “fellfields”. In such ecosystems, microbial communities should be essential for soil-plant functioning but their diversity is poorly explored. The sub-Antarctic Kerguelen Islands fellfields are characterized by an endemic long-lived cushion plant, Lyallia kerguelensis which rhizosphere may be a shelter for microbes in this harsh environment. Cushions are affected by necrosis and we expect the rhizomicrobiome composition to be related to plant necrosis. We analysed bacterial and fungal communities in bulk- and rhizospheric soils from L. kerguelensis in five different fellfields across the Kerguelen Islands using 16S rRNA and ITS1 metabarcoding. We found that soil microbial communities were composed of both restricted and cosmopolitan taxa. While all sites were dominated by the same bacterial taxa (Chloroflexi, Actinobacteria, α-Proteobacteria and Acidobacteria), the relative abundance of the main fungal phyla (Ascomycota, Basidiomycota, Mortierellomycota and Rozellomycota) highly differed between sites. L. kerguelensis rhizomicrobiome was at least as diverse as the bulk soil, making the rhizosphere a possible reservoir of microbial diversity. It was composed of the same main bacterial phyla than detected in the bulk soil while the composition of the rhizosphere fungal communities was specific to each plant. No common microorganisms were identified regarding cushion necrosis extent across plants and sites, but several microbial putative functions were shared, suggesting a possible shift in soil functioning with cushion necrosis increase. Our study brings new information on the diversity and composition of the microbial communities of fellfield soils in a sub-Antarctic Island and the rhizomicrobiome of a characteristic endemic cushion plant. Article in Journal/Newspaper Antarc* Antarctic Kerguelen Islands Directory of Open Access Journals: DOAJ Articles Antarctic Kerguelen Kerguelen Islands Frontiers in Soil Science 2 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
sub-Antarctic bacteria fungi Lyallia kerguelensis cushion plant dieback Chemistry QD1-999 Engineering geology. Rock mechanics. Soil mechanics. Underground construction TA703-712 |
spellingShingle |
sub-Antarctic bacteria fungi Lyallia kerguelensis cushion plant dieback Chemistry QD1-999 Engineering geology. Rock mechanics. Soil mechanics. Underground construction TA703-712 Lorène Julia Marchand Françoise Hennion Michèle Tarayre Marie-Claire Martin Benoit Renaud Martins Cécile Monard Fellfields of the Kerguelen Islands harbour specific soil microbiomes and rhizomicrobiomes of an endemic plant facing necrosis |
topic_facet |
sub-Antarctic bacteria fungi Lyallia kerguelensis cushion plant dieback Chemistry QD1-999 Engineering geology. Rock mechanics. Soil mechanics. Underground construction TA703-712 |
description |
Polar regions are characterized by rocky terrains with sparse vegetation and oligotrophic soils, i.e. “fellfields”. In such ecosystems, microbial communities should be essential for soil-plant functioning but their diversity is poorly explored. The sub-Antarctic Kerguelen Islands fellfields are characterized by an endemic long-lived cushion plant, Lyallia kerguelensis which rhizosphere may be a shelter for microbes in this harsh environment. Cushions are affected by necrosis and we expect the rhizomicrobiome composition to be related to plant necrosis. We analysed bacterial and fungal communities in bulk- and rhizospheric soils from L. kerguelensis in five different fellfields across the Kerguelen Islands using 16S rRNA and ITS1 metabarcoding. We found that soil microbial communities were composed of both restricted and cosmopolitan taxa. While all sites were dominated by the same bacterial taxa (Chloroflexi, Actinobacteria, α-Proteobacteria and Acidobacteria), the relative abundance of the main fungal phyla (Ascomycota, Basidiomycota, Mortierellomycota and Rozellomycota) highly differed between sites. L. kerguelensis rhizomicrobiome was at least as diverse as the bulk soil, making the rhizosphere a possible reservoir of microbial diversity. It was composed of the same main bacterial phyla than detected in the bulk soil while the composition of the rhizosphere fungal communities was specific to each plant. No common microorganisms were identified regarding cushion necrosis extent across plants and sites, but several microbial putative functions were shared, suggesting a possible shift in soil functioning with cushion necrosis increase. Our study brings new information on the diversity and composition of the microbial communities of fellfield soils in a sub-Antarctic Island and the rhizomicrobiome of a characteristic endemic cushion plant. |
format |
Article in Journal/Newspaper |
author |
Lorène Julia Marchand Françoise Hennion Michèle Tarayre Marie-Claire Martin Benoit Renaud Martins Cécile Monard |
author_facet |
Lorène Julia Marchand Françoise Hennion Michèle Tarayre Marie-Claire Martin Benoit Renaud Martins Cécile Monard |
author_sort |
Lorène Julia Marchand |
title |
Fellfields of the Kerguelen Islands harbour specific soil microbiomes and rhizomicrobiomes of an endemic plant facing necrosis |
title_short |
Fellfields of the Kerguelen Islands harbour specific soil microbiomes and rhizomicrobiomes of an endemic plant facing necrosis |
title_full |
Fellfields of the Kerguelen Islands harbour specific soil microbiomes and rhizomicrobiomes of an endemic plant facing necrosis |
title_fullStr |
Fellfields of the Kerguelen Islands harbour specific soil microbiomes and rhizomicrobiomes of an endemic plant facing necrosis |
title_full_unstemmed |
Fellfields of the Kerguelen Islands harbour specific soil microbiomes and rhizomicrobiomes of an endemic plant facing necrosis |
title_sort |
fellfields of the kerguelen islands harbour specific soil microbiomes and rhizomicrobiomes of an endemic plant facing necrosis |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fsoil.2022.995716 https://doaj.org/article/a156c9ccdc5340a795b39a28d7a929fc |
geographic |
Antarctic Kerguelen Kerguelen Islands |
geographic_facet |
Antarctic Kerguelen Kerguelen Islands |
genre |
Antarc* Antarctic Kerguelen Islands |
genre_facet |
Antarc* Antarctic Kerguelen Islands |
op_source |
Frontiers in Soil Science, Vol 2 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fsoil.2022.995716/full https://doaj.org/toc/2673-8619 2673-8619 doi:10.3389/fsoil.2022.995716 https://doaj.org/article/a156c9ccdc5340a795b39a28d7a929fc |
op_doi |
https://doi.org/10.3389/fsoil.2022.995716 |
container_title |
Frontiers in Soil Science |
container_volume |
2 |
_version_ |
1766265361593794560 |