FN Archimer Export Format PT J TI Adaptation of Temperate Seagrass to Arctic Light Relies on Seasonal Acclimatization of Carbon Capture and Metabolism BT AF Jueterbock, Alexander Duarte, Bernardo Coyer, James Olsen, Jeanine L. Kopp, Martina Elisabeth Luise Smolina, Irina Arnaud-Haond, Sophie Hu, Zi-Min Hoarau, Galice AS 1:1;2:2,3;3:4;4:5;5:6;6:6;7:7;8:8;9:6; FF 1:;2:;3:;4:;5:;6:;7:PDG-RBE-MARBEC-LHM;8:;9:; C1 Algal and Microbial Biotechnology Division, Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway Marine and Environmental Sciences Centre, Faculty of Sciences of the University of Lisbon, Lisbon, Portugal Departamento de Biologia Vegetal da Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal Shoals Marine Laboratory, University of New Hampshire, Durham, NH, United States Ecological Genetics-Genomics Group, Groningen Institute of Evolutionary Life Sciences, University of Groningen, Groningen, Netherlands Marine Molecular Ecology Group, Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway UMR MARBEC Marine Biodiversity Exploitation and Conservation, Univ Montpellier, CNRS, IFREMER, IRD, Montpellier, France Ocean School, Yantai University, Yantai, China C2 UNIV NORD, NORWAY UNIV LISBON, PORTUGAL UNIV LISBOA, PORTUGAL UNIV NEW HAMPSHIRE, USA UNIV GRONINGEN, NETHERLANDS UNIV NORD, NORWAY IFREMER, FRANCE UNIV YANTAI, CHINA SI SETE SE PDG-RBE-MARBEC-LHM UM MARBEC IN WOS Ifremer UMR DOAJ copubli-europe copubli-int-hors-europe copubli-sud IF 6.627 TC 4 UR https://archimer.ifremer.fr/doc/00738/85024/89979.pdf https://archimer.ifremer.fr/doc/00738/85024/89980.docx LA English DT Article DE ;eelgrass (Zostera marina);climate change;Arctic light;respiration;photosynthesis;carbon capture;daylength;energy storage AB Due to rising global surface temperatures, Arctic habitats are becoming thermally suitable for temperate species. Whether a temperate species can immigrate into an ice-free Arctic depends on its ability to tolerate extreme seasonal fluctuations in daylength. Thus, understanding adaptations to polar light conditions can improve the realism of models predicting poleward range expansions in response to climate change. Plant adaptations to polar light have rarely been studied and remain unknown in seagrasses. If these ecosystem engineers can migrate polewards, seagrasses will enrich biodiversity, and carbon capture potential in shallow coastal regions of the Arctic. Eelgrass (Zostera marina) is the most widely distributed seagrass in the northern hemisphere. As the only seagrass species growing as far north as 70°N, it is the most likely candidate to first immigrate into an ice-free Arctic. Here, we describe seasonal (and diurnal) changes in photosynthetic characteristics, and in genome-wide gene expression patterns under strong annual fluctuations of daylength. We compared PAM measurements and RNA-seq data between two populations at the longest and shortest day of the year: (1) a Mediterranean population exposed to moderate annual fluctuations of 10–14 h daylength and (2) an Arctic population exposed to high annual fluctuations of 0–24 h daylength. Most of the gene expression specificities of the Arctic population were found in functions of the organelles (chloroplast and mitochondrion). In winter, Arctic eelgrass conserves energy by repressing respiration and reducing photosynthetic energy fluxes. Although light-reactions, and genes involved in carbon capture and carbon storage were upregulated in summer, enzymes involved in CO2 fixation and chlorophyll-synthesis were upregulated in winter, suggesting that winter metabolism relies not only on stored energy resources but also on active use of dim light conditions. Eelgrass is unable to use excessive amounts of light during summer and demonstrates a significant reduction in photosynthetic performance under long daylengths, possibly to prevent photoinhibition constrains. Our study identified key mechanisms that allow eelgrass to survive under Arctic light conditions and paves the way for experimental research to predict whether and up to which latitude eelgrass can potentially migrate polewards in response to climate change. PY 2021 PD DEC SO Frontiers In Plant Science SN 1664-462X PU Frontiers Media SA VL 12 UT 000730869600001 DI 10.3389/fpls.2021.745855 ID 85024 ER EF