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• W3180894516 endingPage "4531" @default.
• W3180894516 startingPage "4518" @default.
• W3180894516 abstract "The symbiotic cyanobacterium UCYN-A is one of the most globally abundant marine dinitrogen (N2 )-fixers, but cultures have not been available and its biology and ecology are poorly understood. We used cultivation-independent approaches to investigate how UCYN-A single-cell N2 fixation rates (NFRs) and nifH gene expression vary as a function of depth and photoperiod. Twelve-hour day/night incubations showed that UCYN-A only fixed N2 during the day. Experiments conducted using in situ arrays showed a light-dependence of NFRs by the UCYN-A symbiosis, with the highest rates in surface waters (5-45 m) and lower rates at depth (≥ 75 m). Analysis of NFRs versus in situ light intensity yielded a light saturation parameter (Ik ) for UCYN-A of 44 μmol quanta m-2 s-1 . This is low compared with other marine diazotrophs, suggesting an ecological advantage for the UCYN-A symbiosis under low-light conditions. In contrast to cell-specific NFRs, nifH gene-specific expression levels did not vary with depth, indicating that light regulates N2 fixation by UCYN-A through processes other than transcription, likely including host-symbiont interactions. These results offer new insights into the physiology of the UCYN-A symbiosis in the subtropical North Pacific Ocean and provide clues to the environmental drivers of its global distributions." @default.
• W3180894516 created "2021-07-19" @default.
• W3180894516 creator A5003372779 @default.
• W3180894516 creator A5012603125 @default.
• W3180894516 creator A5031240799 @default.
• W3180894516 creator A5050834581 @default.
• W3180894516 creator A5069056506 @default.
• W3180894516 creator A5077254525 @default.
• W3180894516 date "2021-07-06" @default.
• W3180894516 modified "2023-10-12" @default.
• W3180894516 title "Light and depth dependency of nitrogen fixation by the non‐photosynthetic, symbiotic cyanobacterium UCYN‐A" @default.
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• W3180894516 doi "https://doi.org/10.1111/1462-2920.15645" @default.

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