LuoQinHeEtAl2013

Référence

Luo, J., Qin, J., He, F., Li, H., Liu, T., Polle, A., Peng, C., Luo, Z.-B. (2013) Net fluxes of ammonium and nitrate in association with H+ fluxes in fine roots of Populus popularis. Planta, 237(4):919-931. (Scopus )

Résumé

Poplar plants are cultivated as woody crops, which are often fertilized by addition of ammonium (NH4 +) and/or nitrate (NO3 -) to improve yields. However, little is known about net NH4 +/NO3 - fluxes and their relation with H+ fluxes in poplar roots. In this study, net NH4 +/NO3 - fluxes in association with H+ fluxes were measured non-invasively using scanning ion-selective electrode technique in fine roots of Populus popularis. Spatial variability of NH4 + and NO3 - fluxes was found along root tips of P. popularis. The maximal net uptake of NH4 + and NO3 - occurred, respectively, at 10 and 15 mm from poplar root tips. Net NH4 + uptake was induced by ca. 48 % with provision of NO3 - together, but net NO3 - uptake was inhibited by ca. 39 % with the presence of NH4 + in poplar roots. Furthermore, inactivation of plasma membrane (PM) H+-ATPases by orthovanadate markedly inhibited net NH4 +/NO3 - uptake and even led to net NH4 + release with NO3 - co-provision. Linear correlations were observed between net NH4 +/NO3 - and H+ fluxes in poplar roots except that no correlation was found between net NH4 + and H+ fluxes in roots exposed to NH4Cl and 0 mM vanadate. These results indicate that root tips play a key role in NH4 +/NO3 - uptake and that net NH4 +/NO3 - fluxes and the interaction of net fluxes of both ions are tightly associated with H+ fluxes in poplar roots. © 2012 Springer-Verlag Berlin Heidelberg.

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@ARTICLE { LuoQinHeEtAl2013,
    AUTHOR = { Luo, J. and Qin, J. and He, F. and Li, H. and Liu, T. and Polle, A. and Peng, C. and Luo, Z.-B. },
    TITLE = { Net fluxes of ammonium and nitrate in association with H+ fluxes in fine roots of Populus popularis },
    JOURNAL = { Planta },
    YEAR = { 2013 },
    VOLUME = { 237 },
    PAGES = { 919-931 },
    NUMBER = { 4 },
    NOTE = { cited By (since 1996)5 },
    ABSTRACT = { Poplar plants are cultivated as woody crops, which are often fertilized by addition of ammonium (NH4 +) and/or nitrate (NO3 -) to improve yields. However, little is known about net NH4 +/NO3 - fluxes and their relation with H+ fluxes in poplar roots. In this study, net NH4 +/NO3 - fluxes in association with H+ fluxes were measured non-invasively using scanning ion-selective electrode technique in fine roots of Populus popularis. Spatial variability of NH4 + and NO3 - fluxes was found along root tips of P. popularis. The maximal net uptake of NH4 + and NO3 - occurred, respectively, at 10 and 15 mm from poplar root tips. Net NH4 + uptake was induced by ca. 48 % with provision of NO3 - together, but net NO3 - uptake was inhibited by ca. 39 % with the presence of NH4 + in poplar roots. Furthermore, inactivation of plasma membrane (PM) H+-ATPases by orthovanadate markedly inhibited net NH4 +/NO3 - uptake and even led to net NH4 + release with NO3 - co-provision. Linear correlations were observed between net NH4 +/NO3 - and H+ fluxes in poplar roots except that no correlation was found between net NH4 + and H+ fluxes in roots exposed to NH4Cl and 0 mM vanadate. These results indicate that root tips play a key role in NH4 +/NO3 - uptake and that net NH4 +/NO3 - fluxes and the interaction of net fluxes of both ions are tightly associated with H+ fluxes in poplar roots. © 2012 Springer-Verlag Berlin Heidelberg. },
    AUTHOR_KEYWORDS = { Efflux; Fertilizer; Influx; Ion uptake; Poplar; Proton },
    CODEN = { PLANA },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1007/s00425-012-1807-7 },
    ISSN = { 00320935 },
    KEYWORDS = { ammonium derivative; nitrate; proton transporting adenosine triphosphatase, article; cell membrane; enzymology; metabolism; plant root; Populus; xylem, Ammonium Compounds; Cell Membrane; Nitrates; Plant Roots; Populus; Proton-Translocating ATPases; Xylem, Populus; Populus popularis },
    SOURCE = { Scopus },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-84875450267&partnerID=40&md5=f0efe8974cf8154095a825d2cdf73a73 },
}

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