dc.contributor.author
Juchem, Desirée P.
dc.contributor.author
Schimani, Katherina
dc.contributor.author
Holzinger, Andreas
dc.contributor.author
Permann, Charlotte
dc.contributor.author
Abarca, Nélida
dc.contributor.author
Skibbe, Oliver
dc.contributor.author
Zimmermann, Jonas
dc.contributor.author
Graeve, Martin
dc.contributor.author
Karsten, Ulf
dc.date.accessioned
2023-09-15T09:42:09Z
dc.date.available
2023-09-15T09:42:09Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/40871
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-40592
dc.description.abstract
In polar regions, the microphytobenthos has important ecological functions in shallow-water habitats, such as on top of coastal sediments. This community is dominated by benthic diatoms, which contribute significantly to primary production and biogeochemical cycling while also being an important component of polar food webs. Polar diatoms are able to cope with markedly changing light conditions and prolonged periods of darkness during the polar night in Antarctica. However, the underlying mechanisms are poorly understood. In this study, five strains of Antarctic benthic diatoms were isolated in the field, and the resulting unialgal cultures were identified as four distinct species, of which one is described as a new species, Planothidium wetzelii sp. nov. All four species were thoroughly examined using physiological, cell biological, and biochemical methods over a fully controlled dark period of 3 months. The results showed that the utilization of storage lipids is one of the key mechanisms in Antarctic benthic diatoms to survive the polar night, although different fatty acids were involved in the investigated taxa. In all tested species, the storage lipid content declined significantly, along with an ultrastructurally observable degradation of the chloroplasts. Surprisingly, photosynthetic performance did not change significantly despite chloroplasts decreasing in thylakoid membranes and an increased number of plastoglobules. Thus, a combination of biochemical and cell biological mechanisms allows Antarctic benthic diatoms to survive the polar night.
en
dc.format.extent
21 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
benthic diatoms
en
dc.subject
photosynthesis
en
dc.subject
lipid consumption
en
dc.subject
plastid degradation
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie
dc.title
Lipid degradation and photosynthetic traits after prolonged darkness in four Antarctic benthic diatoms, including the newly described species Planothidium wetzelii sp. nov.
dc.type
Wissenschaftlicher Artikel
dc.date.updated
2023-09-14T13:40:48Z
dcterms.bibliographicCitation.articlenumber
1241826
dcterms.bibliographicCitation.doi
10.3389/fmicb.2023.1241826
dcterms.bibliographicCitation.journaltitle
Frontiers in Microbiology
dcterms.bibliographicCitation.volume
14
dcterms.bibliographicCitation.url
https://doi.org/10.3389/fmicb.2023.1241826
refubium.affiliation
Botanischer Garten und Botanisches Museum Berlin-Dahlem (BGBM)
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
1664-302X
refubium.resourceType.provider
DeepGreen