{"refrec":{"BRefID":36283,"RR":"<b>Vermeer, C.P.; Escher, M.; Portielje, R.; de Klein, J.J.M.</b> (2003). Nitrogen uptake and translocation by <i>Chara</i>. <i>Aquat. Bot. 76(3)</i>: 245-258. <a href=\"http://dx.doi.org/10.1016/s0304-3770(03)00056-1\" target=\"_blank\">http://dx.doi.org/10.1016/s0304-3770(03)00056-1</a>","BEntID":36283,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Aquat. Bot. 76(3)</i>: 245-258. <a href=\"https://dx.doi.org/10.1016/s0304-3770(03)00056-1\" target=\"_blank\">https://dx.doi.org/10.1016/s0304-3770(03)00056-1</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":1,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Vermeer, C.P.; Escher, M.; Portielje, R.; de Klein, J.J.M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Vermeer, C.P. <i>et al.</i>","Englishabstract":"The potential for above-ground and below-ground uptake and subsequent internal translocation of ammonium (NH<sub>4</sub><sup>+</sup>) and nitrate (NO<sub>3</sub><sup>-</sup>) by the macroalga <i>Chara</i> spp. was investigated. In a two compartment experimental set-up separating above-ground and below-ground algal parts, the charophytes were exposed to various combinations of <sup>15</sup>N-labelled NH<sub>4</sub><sup>+</sup> and NO<sub>3</sub><sup>-</sup>. Uptake in one compartment and translocation to the other were measured. <i>Chara</i> spp. was able to take up and translocate nitrogen between below-ground and above-ground parts. Uptake of <sup>15</sup>NH<sub>4</sub><sup>+</sup> in rhizoids was two-fold higher than that of <sup>15</sup>NO<sub>3</sub><sup>-</sup>, indicating a preferential uptake of <sup>15</sup>NH<sub>4</sub><sup>+</sup>. Translocation after 5 days was always less in the direction from above-ground to below-ground parts (on average 2% of total <sup>15</sup>N uptake), than in the below-ground to above-ground direction (on average 29%). Translocation occurred when the ratio of <sup>15</sup>N-atomic percentage in the algal material in the exposed compartment roughly exceeded 2%, and was thus more determined by the internal gradient in the <sup>15</sup>N content than by the nature of the N source (either NH<sub>4</sub><sup>+</sup> or NO<sub>3</sub><sup>-</sup>). Translocation of <sup>15</sup>N from the below-ground to the above-ground compartment also occurred when the charophytes were exposed to high concentrations of either NO<sub>3</sub><sup>-</sup> or NH<sub>4</sub><sup>+</sup> in the above-ground compartment. The results of this study are supportive for a mechanism with preferential uptake of NH<sub>4</sub><sup>+</sup> over NO<sub>3</sub><sup>-</sup>, and subsequent passive diffusion between cells as the dominant transport mechanism.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Nitrogen uptake and translocation by <i>Chara</i>","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Chara; nitrogen uptake; translocation; nitrate; ammonium","OtherDescriptors":null,"Notes":null,"AnaPub":2003,"MonPub":null,"DateUpdate":"2018-05-17","DateCreate":"2003-07-14","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000184319900006","VABBcode":null,"OpenAcc":1,"DOI":"10.1016/s0304-3770(03)00056-1"},"refs":null,"anarec":{"AnaID":36283,"PubliDate":2003,"Pagination":"245-258","XtraPublOfAnaID":null,"ISBN":null,"Volume":"76","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42195,"SerRR":"Aquatic Botany. 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