FN Archimer Export Format PT J TI Sharing Vitamin B12 between Bacteria and Microalgae Does Not Systematically Occur: Case Study of the Haptophyte Tisochrysis lutea BT AF Nef, Charlotte Dittami, Simon Kaas, Raymond Briand, Enora Noël, Cyril Mairet, Francis Garnier, Matthieu AS 1:1;2:2;3:1;4:3;5:4;6:5;7:3; FF 1:PDG-RBE-BRM-LPBA;2:;3:PDG-RBE-BRM-LPBA;4:PDG-ODE-PHYTOX-GENALG;5:PDG-IRSI-SEBIMER;6:PDG-ODE-PHYTOX-PHYSALG;7:PDG-ODE-PHYTOX-GENALG; C1 Physiologie et Biotechnologie des Algues, IFREMER, Rue de l’Ile d’Yeu, F-44311 Nantes, France Station Biologique de Roscoff, Integrative Biology of Marine Models Laboratory, CNRS, Sorbonne University, F-29680 Roscoff, France GENALG, PHYTOX, IFREMER, F-44000 Nantes, France SEBIMER, IRSI, IFREMER, F-29280 Brest, France PHYSALG, PHYTOX, IFREMER, F-44000 Nantes, France C2 IFREMER, FRANCE UNIV SORBONNE, FRANCE IFREMER, FRANCE IFREMER, FRANCE IFREMER, FRANCE SI NANTES BREST SE PDG-RBE-BRM-LPBA PDG-ODE-PHYTOX-GENALG PDG-IRSI-SEBIMER PDG-ODE-PHYTOX-PHYSALG IN WOS Ifremer UPR DOAJ copubli-france copubli-univ-france IF 4.5 TC 5 UR https://archimer.ifremer.fr/doc/00781/89341/94813.pdf https://archimer.ifremer.fr/doc/00781/89341/94814.zip LA English DT Article DE ;microbial interactions;vitamin B-12;cobalamin;haptophytes;Tisochrysis lutea;phytoplankton AB Haptophyte microalgae are key contributors to microbial communities in many environments. It has been proposed recently that members of this group would be virtually all dependent on vitamin B12 (cobalamin), an enzymatic cofactor produced only by some bacteria and archaea. Here, we examined the processes of vitamin B12 acquisition by haptophytes. We tested whether co-cultivating the model species Tisochrysis lutea with B12-producing bacteria in vitamin-deprived conditions would allow the microalga to overcome B12 deprivation. While T. lutea can grow by scavenging vitamin B12 from bacterial extracts, co-culture experiments showed that the algae did not receive B12 from its associated bacteria, despite bacteria/algae ratios supposedly being sufficient to allow enough vitamin production. Since other studies reported mutualistic algae–bacteria interactions for cobalamin, these results question the specificity of such associations. Finally, cultivating T. lutea with a complex bacterial consortium in the absence of the vitamin partially rescued its growth, highlighting the importance of microbial interactions and diversity. This work suggests that direct sharing of vitamin B12 is specific to each species pair and that algae in complex natural communities can acquire it indirectly by other mechanisms (e.g., after bacterial lysis). PY 2022 PD JUN SO Microorganisms SN 2076-2607 PU MDPI AG VL 10 IS 7 UT 000834403900001 DI 10.3390/microorganisms10071337 ID 89341 ER EF