{"refrec":{"BRefID":367558,"RR":"<b>Gain, G.; Berne, N.; Feller, T.; Godaux, D.; Cenci, U.; Cardol, P.</b> (2023). Induction of photosynthesis under anoxic condition in <i>Thalassiosira pseudonana</i> and <i>Euglena gracilis</i>: interactions between fermentation and photosynthesis. <i>Front. Plant Sci. 14</i>: 1186926. <a href=\"https://dx.doi.org/10.3389/fpls.2023.1186926\" target=\"_blank\">https://dx.doi.org/10.3389/fpls.2023.1186926</a>","BEntID":365283,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Front. Plant Sci. 14</i>: 1186926. <a href=\"https://dx.doi.org/10.3389/fpls.2023.1186926\" target=\"_blank\">https://dx.doi.org/10.3389/fpls.2023.1186926</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Gain, G.; Berne, N.; Feller, T.; Godaux, D.; Cenci, U.; Cardol, P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gain, G. <i>et al.</i>","Englishabstract":"<strong>Introduction:</strong> In their natural environment, microalgae can be transiently exposed to hypoxic or anoxic environments. Whereas fermentative pathways and their interactions with photosynthesis are relatively well characterized in the green alga model <i>Chlamydomonas reinhardtii</i>, little information is available in other groups of photosynthetic micro-eukaryotes. In <i>C. reinhardtii</i> cyclic electron flow (CEF) around photosystem (PS) I, and light-dependent oxygen-sensitive hydrogenase activity both contribute to restoring photosynthetic linear electron flow (LEF) in anoxic conditions.&nbsp;<strong>Methods:</strong> Here we analyzed photosynthetic electron transfer after incubation in dark anoxic conditions (up to 24&nbsp;h) in two secondary microalgae: the marine diatom <i>Thalassiosira pseudonana</i> and the excavate <i>Euglena gracilis</i>.<strong>Results:</strong> Both species showed sustained abilities to prevent over-reduction of photosynthetic electron carriers and to restore LEF. A high and transient CEF around PSI was also observed specifically in anoxic conditions at light onset in both species. In contrast, at variance with <i>C. reinhardtii</i>, no sustained hydrogenase activity was detected in anoxic conditions in both species.<strong>Discussion:</strong> Altogether our results suggest that another fermentative pathway might contribute, along with CEF around PSI, to restore photosynthetic activity in anoxic conditions in <i>E. gracilis</i> and <i>T. pseudonana</i>. We discuss the possible implication of the dissimilatory nitrate reduction to ammonium (DNRA) in <i>T. pseudonana</i> and the wax ester fermentation in <i>E. gracilis</i>.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Induction of photosynthesis under anoxic condition in <i>Thalassiosira pseudonana</i> and <i>Euglena gracilis</i>: interactions between fermentation and photosynthesis","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-05-04 01:32:45.739253","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Euglena gracilis;Thalassiosira pseudonana;fermentation;photosynthesis;hydrogenase;cyclic electron flow (CEF);WAX-ESTER FERMENTATION;CYCLIC ELECTRON FLOW;MULTIPLE SEQUENCE ALIGNMENT;CHLAMYDOMONAS-REINHARDTII;PYRUVATE-NADP(+) OXIDOREDUCTASE;CHLOROPHYLL FLUORESCENCE;PHOTOSYSTEM-II;CO2 FIXATION;METABOLISM;HYDROGENASE","OtherDescriptors":null,"Notes":null,"AnaPub":2023,"MonPub":null,"DateUpdate":"2025-09-18","DateCreate":"2023-10-02","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:001042609300001","VABBcode":null,"OpenAcc":1,"DOI":"10.3389/fpls.2023.1186926"},"refs":null,"anarec":{"AnaID":367558,"PubliDate":2023,"Pagination":"1186926","XtraPublOfAnaID":null,"ISBN":null,"Volume":"14","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":258967,"SerRR":"Frontiers in Plant Science. 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