{"refrec":{"BRefID":119747,"RR":"<b>Van Leeuwe, M.A.; Stefels, J.</b> (2007). Photosynthetic responses in <i>Phaeocystis antarctica </i>towards varying light and iron conditions. <i>Biogeochemistry 83(1-3)</i>: 61-70. <a href=\"https://dx.doi.org/10.1007/s10533-007-9083-5\" target=\"_blank\">https://dx.doi.org/10.1007/s10533-007-9083-5</a>","BEntID":113973,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Biogeochemistry 83(1-3)</i>: 61-70. <a href=\"https://dx.doi.org/10.1007/s10533-007-9083-5\" target=\"_blank\">https://dx.doi.org/10.1007/s10533-007-9083-5</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Van Leeuwe, M.A.; Stefels, J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Van Leeuwe, M.A.; Stefels, J.","Englishabstract":"The effects of iron limitation on photoacclimation to a dynamic light regime were studied in <i>Phaeocystis antarctica</i>. Batch cultures were grown under a sinusoidal light regime, mimicking vertical mixing, under both iron-sufficient and -limiting conditions. Iron-replete cells responded to changes in light intensity by rapid xanthophyll cycling. Maximum irradiance coincided with maximum ratios of diatoxanthin/diadinoxanthin (dt/dd). The maximum quantum yield of photosynthesis (Fv/Fm) was negatively related to both irradiance and dt/dd. Full recovery of Fv/Fm by the end of the light period suggested successful photoacclimation. Iron-limited cells displayed characteristics of high light acclimation. The ratio of xanthophyll pigments to chlorophyll a was three times higher compared to iron-replete cells. Down-regulation of photosynthetic activity was moderated. It is argued that under iron limitation cells maintain a permanent state of high energy quenching to avoid photoinhibition during exposure to high irradiance. Iron-limited cells could maintain a high growth potential due to an increased absorption capacity as recorded by in vivo absorption, which balanced a decrease in Fv/Fm. The increase in the chlorophyll a-specific absorption cross section was related to an increase in carotenoid pigments and a reduction in the package effect. These experiments show that <i>P. antarctica</i> can acclimate successfully to conditions as they prevail in the Antarctic ocean, which may explain the success of this species. 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Springer: Dordrecht; Lancaster; Boston.  ISSN 0168-2563; e-ISSN 1573-515X","StandardTitleSer":"Biogeochemistry","ISSN":"0168-2563","AbbrevSer":"Biogeochemistry","StandardTitleMon":null,"StartPage":61,"Pages":10,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":[{"YBRefID":120024,"RefStrFull":"<b>Van Leeuwe, M.A.; Stefels, J.; Belviso, S.; Lancelot, C.; Verity, P.G.; Gieskes, W.W.C. (Ed.)</b> (2007). <i>Phaeocystis</i>, major link in the biogeochemical cycling of climate-relevant elements. <i>Biogeochemistry</i>, 83(1-3). Springer: Dordrecht. 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