Data/hora: 13/06/2024 02:40:32

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Kleptoplastidic benthic foraminifera from aphotic habitats: Insights into assimilation of inorganic C, N, and S studied with sub-cellular resolution
Autores: | Jauffrais, Thierry; Lekieffre, Charlotte; Schweizer, Magali; Geslin, Emmanuelle; Metzger, Edouard; Bernhard, Joan M.; Jesus, Bruno; Filipsson, Helena L.; Maire, Olivier; Meibom, Anders.
Data: | 2019-01
Ano: | 2019
Resumo: | The assimilation of inorganic compounds in foraminiferal metabolism compared to predation or organic matter assimilation is unknown. Here we investigate possible inorganic‐compound assimilation in Nonionellina labradorica, a common kleptoplastidic benthic foraminifer from Arctic and North Atlantic sublittoral regions. The objectives were to identify the source of the foraminiferal kleptoplasts, assess their photosynthetic functionality in light and darkness, and investigate inorganic nitrogen and sulfate assimilation. We used DNA barcoding of a ~830 bp fragment from the SSU rDNA to identify the kleptoplasts, and correlated transmission electron microscopy and nanometer‐scale secondary ion mass spectrometry (TEM‐NanoSIMS) isotopic imaging to study 13C‐bicarbonate, 15N‐ammonium, and 34S‐sulfate uptake. In addition, respiration rate measurements were determined to assess the response of N. labradorica to light. The DNA sequences established that over 80% of the kleptoplasts belonged to Thalassiosira (with 96‐99% identity), a cosmopolitan planktonic diatom. TEM‐NanoSIMS imaging revealed degraded cytoplasm and an absence of 13C assimilation in foraminifera exposed to light. Oxygen measurements showed higher respiration rates under light than dark conditions, and no O2 production was detected. These results indicate that the photosynthetic pathways in N. labradorica are not functional. Furthermore, N. labradorica assimilated both 15N‐ammonium and 34S‐sulfate into its cytoplasm, which suggests that foraminifera might have several ammonium or sulfate assimilation pathways, involving either the kleptoplasts or bona fide foraminiferal pathway(s) not yet identified.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00460/57188/59151.pdf

DOI:10.1111/1462-2920.14433

https://archimer.ifremer.fr/doc/00460/57188/

Editor: | Wiley
Formato: | application/pdf
Fonte: | Environmental Microbiology (1462-2912) (Wiley), 2019-01 , Vol. 21 , N. 1 , P. 125-141

Fonte:

2018 Society for Applied Microbiology and John Wiley &amp; Sons Ltd

info:eu-repo/semantics/openAccess

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