{"refrec":{"BRefID":98309,"RR":"<b>Huovinen, P.; Matos, J.; Pinto, I.S.; Figueroa, F.L.</b> (2006). The role of ammonium in photoprotection against high irradiance in the red alga <i>Grateloupia lanceola</i>. <i>Aquat. Bot. 84(4)</i>: 308-316. <a href=\"https://dx.doi.org/10.1016/j.aquabot.2005.12.002\" target=\"_blank\">https://dx.doi.org/10.1016/j.aquabot.2005.12.002</a>","BEntID":93663,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Aquat. Bot. 84(4)</i>: 308-316. <a href=\"https://dx.doi.org/10.1016/j.aquabot.2005.12.002\" target=\"_blank\">https://dx.doi.org/10.1016/j.aquabot.2005.12.002</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Huovinen, P.; Matos, J.; Pinto, I.S.; Figueroa, F.L.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Huovinen, P. <i>et al.</i>","Englishabstract":"Combined and/or interactive effects of inorganic nitrogen (as ammonium) and irradiance on the accumulation of nitrogenous compounds, like UV-absorbing mycosporine-like amino acids (MAAs), chlorophyll a and phycobiliproteins, were examined in the red alga <i>Grateloupia lanceola</i> (J. Agardh) J. Agardh in a high irradiance laboratory exposure and a subsequent recovery period under low light. Also, photosynthetic activity as in vivo chlorophyll fluorescence of photosystem II, i.e. optimum quantum yield (<i>F</i><sub>v</sub>/<i>F</i><sub>m</sub>), electron transport rate (ETR) and quantum efficiency, were examined. Photosynthetic activity, phycobiliproteins and internal nitrogen content declined during the 3-day PAR (photosynthetically active radiation; 600 μmol s<sup>−1</sup> m<sup>−2</sup>) and PAR + UVR (ultraviolet radiation; UVB 280–315 nm 0.8 W m<sup>−2</sup>, UVA 315–400 nm 16 W m<sup>−2</sup>) exposure. Ammonium supplied in the culture medium (0, 100 and 300 μM NH<sub>4</sub>Cl) modified the responses of the alga to high irradiance exposures in a concentration dependent manner, mainly with respect to recovery, as the highest recovery during a 10-day low light period was produced under elevated concentration of ammonium (300 μM). The recovery of photosynthetic activity and phycobiliproteins was enhanced in the algae previously incubated under PAR + UVR as compared to exposure to only PAR, suggesting a beneficial effect of UVR on recovery or photoprotective processes under enriched nitrogen conditions. However, the content of MAAs did not follow the same pattern and thus it could not be concluded as the cause of observed enhanced recovery.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"The role of ammonium in photoprotection against high irradiance in the red alga <i>Grateloupia lanceola</i>","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-14 01:31:12.562845","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2006,"MonPub":null,"DateUpdate":"2020-10-19","DateCreate":"2006-04-25","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000236617300005","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.aquabot.2005.12.002"},"refs":null,"anarec":{"AnaID":98309,"PubliDate":2006,"Pagination":"308-316","XtraPublOfAnaID":null,"ISBN":null,"Volume":"84","Issue":"4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42195,"SerRR":"Aquatic Botany. 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