{"refrec":{"BRefID":28507,"RR":"<b>Heredia, M.A.; Zapico, R.; García-Sánchez, M.J.; Fernández, J.A.</b> (2002). Effect of calcium, sodium and pH on uptake and accumulation of radiocesium by <i>Riccia fluitans</i>. <i>Aquat. Bot. 74(3)</i>: 245-256. <a href=\"http://dx.doi.org/10.1016/s0304-3770(02)00107-9\" target=\"_blank\">http://dx.doi.org/10.1016/s0304-3770(02)00107-9</a>","BEntID":28507,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Aquat. Bot. 74(3)</i>: 245-256. <a href=\"https://dx.doi.org/10.1016/s0304-3770(02)00107-9\" target=\"_blank\">https://dx.doi.org/10.1016/s0304-3770(02)00107-9</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":1,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Heredia, M.A.; Zapico, R.; García-Sánchez, M.J.; Fernández, J.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Heredia, M.A. <i>et al.</i>","Englishabstract":"The effect of external Ca<sup>2+</sup>, Na<sup>+</sup> and H<sup>+</sup> concentrations on radiocesium uptake and concentration factor (CF) was analysed in<i> Riccia fluitans</i> plants grown in K<sup>+</sup>-deficient and K<sup>+</sup>-sufficient conditions. The kinetics of the high-affinity K<sup>+</sup>/Cs<sup>+</sup> transporter were also analysed in K<sup>+</sup>-deficient plants. The K<sup>+</sup> regime determined Cs<sup>+</sup> uptake rates and CF: both variables were higher in K<sup>+</sup>-deficient plants than in K<sup>+</sup>-sufficient plants irrespective of the Ca<sup>2+</sup>, Na<sup>+</sup> or H<sup>+</sup> concentrations. The effect of Ca<sup>2+</sup> depended on the K<sup>+</sup> regime. Cesium uptake rates and CF increased in K<sup>+</sup>-sufficient plants, 6- and 12-fold, respectively, at decreasing Ca<sup>2+</sup> concentrations, whereas the Cs<sup>+</sup> uptake rate decreased by 50% in K<sup>+</sup>-deficient plants and CF showed a maximum at intermediate Ca<sup>2+</sup> concentrations (0.1mM). The observed effect of Cs<sup>+</sup> uptake rates in K<sup>+</sup>-deficient plants can be explained by a decrease in the maximum velocity and the affinity of the transporter at low Ca<sup>2+</sup> concentrations. Cesium uptake rates decreased by 75% at alkaline pH in K<sup>+</sup>-deficient plants, as did (by 40%) the maximum velocity of the transporter, while CF reached almost zero values. CF declined by 90% at acid pH but Cs<sup>+</sup> uptake rates only decreased by 20% and the maximum velocity of the transporter was relatively constant. Both Cs<sup>+</sup> uptake rates and CF showed a maximum at pH 7.5. No significant pH effect was found in K<sup>+</sup>-sufficient plants. Cesium uptake rates increased by almost three-fold at low Na<sup>+</sup> concentrations in both K<sup>+</sup> regimes. The increase in uptake rates in K<sup>+</sup>-deficient plants paralleled the increment in both the maximum velocity of the transporter and its affinity for K<sup>+</sup> and Cs<sup>+</sup>. CF also increased with low Na<sup>+</sup> concentrations at both K<sup>+</sup> regimes but less so in K<sup>+</sup>-deficient (three-fold) than in K<sup>+</sup>-sufficient plants (30-fold). In conclusion, both Cs<sup>+</sup> uptake and accumulation would show a maximum in K<sup>+</sup>-deficient<i> R. fluitans</i> plants in media with neutral pH, very low Na<sup>+</sup> and intermediate (0.1mM) Ca<sup>2+</sup> concentrations.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Effect of calcium, sodium and pH on uptake and accumulation of radiocesium by <i>Riccia fluitans</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":"calcium; pH; sodium; radiocesium uptake; cesium accumulation; membranepotential; Riccia fluitans","OtherDescriptors":null,"Notes":null,"AnaPub":2002,"MonPub":null,"DateUpdate":"2018-05-17","DateCreate":"2002-10-16","SecASFANote":"Effect of Ca, Na and pH on Cs-uptake by <i>Riccia fluitans</i>","ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000178558100005","VABBcode":null,"OpenAcc":1,"DOI":"10.1016/s0304-3770(02)00107-9"},"refs":null,"anarec":{"AnaID":28507,"PubliDate":2002,"Pagination":"245-256","XtraPublOfAnaID":null,"ISBN":null,"Volume":"74","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42195,"SerRR":"Aquatic Botany. 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