Microbial rhodopsins are increasingly favoured over chlorophyll in High Nutrient Low Chlorophyll waters.

Autor: Hassanzadeh B; Department of Biological Sciences, University of Southern California, Los Angeles, CA, 90089, USA., Thomson B; Department of Marine Science, University of Otago, Dunedin, 9016, New Zealand., Deans F; Department of Marine Science, University of Otago, Dunedin, 9016, New Zealand., Wenley J; Department of Marine Science, University of Otago, Dunedin, 9016, New Zealand.; Department of Microbiology and Immunology, University of Otago, Dunedin, 9016, New Zealand., Lockwood S; Department of Microbiology and Immunology, University of Otago, Dunedin, 9016, New Zealand., Currie K; National Institute of Water and Atmospheric Research, Dunedin, New Zealand., Morales SE; Department of Microbiology and Immunology, University of Otago, Dunedin, 9016, New Zealand., Steindler L; Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, BC, Israel., Sañudo-Wilhelmy SA; Department of Biological Sciences, University of Southern California, Los Angeles, CA, 90089, USA., Baltar F; Department of Functional & Evolutionary Ecology, University of Vienna, Vienna, Austria., Gómez-Consarnau L; Department of Biological Sciences, University of Southern California, Los Angeles, CA, 90089, USA.; Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, BC, México.
Jazyk: angličtina
Zdroj: Environmental microbiology reports [Environ Microbiol Rep] 2021 Jun; Vol. 13 (3), pp. 401-406. Date of Electronic Publication: 2021 Apr 18.
DOI: 10.1111/1758-2229.12948
Abstrakt: Microbial rhodopsins are simple light-harvesting complexes that, unlike chlorophyll photosystems, have no iron requirements for their synthesis and phototrophic functions. Here, we report the environmental concentrations of rhodopsin along the Subtropical Frontal Zone off New Zealand, where Subtropical waters encounter the iron-limited Subantarctic High Nutrient Low Chlorophyll (HNLC) region. Rhodopsin concentrations were highest in HNLC waters where chlorophyll-a concentrations were lowest. Furthermore, while the ratio of rhodopsin to chlorophyll-a photosystems was on average 20 along the transect, this ratio increased to over 60 in HNLC waters. We further show that microbial rhodopsins are abundant in both picoplankton (0.2-3 μm) and in the larger (>3 μm) size fractions of the microbial community containing eukaryotic plankton and/or particle-attached prokaryotes. These findings suggest that rhodopsin phototrophy could be critical for microbial plankton to adapt to resource-limiting environments where photosynthesis and possibly cellular respiration are impaired.
(© 2021 Society for Applied Microbiology and John Wiley & Sons Ltd.)
Databáze: MEDLINE
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