LuoLiLiuEtAl2013

Référence

Luo, J., Li, H., Liu, T., Polle, A., Peng, C., Luo, Z.-B. (2013) Nitrogen metabolism of two contrasting poplar species during acclimation to limiting nitrogen availability. Journal of Experimental Botany, 64(14):4207-4224. (Scopus )

Résumé

To investigate N metabolism of two contrasting Populus species in acclimation to low N availability, saplings of slow-growing species (Populus popularis, Pp) and a fast-growing species (Populus alba × Populus glandulosa, Pg) were exposed to 10, 100, or 1000 µM NH4NO 3. Despite greater root biomass and fine root surface area in Pp, lower net infuxes of NH4 + and NO3 - at the root surface were detected in Pp compared to those in Pg, corresponding well to lower NH4 + and NO3 - content and total N concentration in Pp roots. Meanwhile, higher stable N isotope composition (δ15N) in roots and stronger responsiveness of transcriptional regulation of 18 genes involved in N metabolism were found in roots and leaves of Pp compared to those of Pg. These results indicate that the N metabolism of Pp is more sensitive to decreasing N availability than that of Pg. In both species, low N treatments decreased net infuxes of NH 4 + and NO3 -, root NH 4 + and foliar NO3 - content, root NR activities, total N concentration in roots and leaves, and transcript levels of most ammonium (AMTs) and nitrate (NRTs) transporter genes in leaves and genes involved in N assimilation in roots and leaves. Low N availability increased fine root surface area, foliar starch concentration, δ15N in roots and leaves, and transcript abundance of several AMTs (e.g. AMT1;2) and NRTs (e.g. NRT1;2 and NRT2;4B) in roots of both species. These data indicate that poplar species slow down processes of N acquisition and assimilation in acclimation to limiting N supply. © The Author 2013.

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@ARTICLE { LuoLiLiuEtAl2013,
    AUTHOR = { Luo, J. and Li, H. and Liu, T. and Polle, A. and Peng, C. and Luo, Z.-B. },
    TITLE = { Nitrogen metabolism of two contrasting poplar species during acclimation to limiting nitrogen availability },
    JOURNAL = { Journal of Experimental Botany },
    YEAR = { 2013 },
    VOLUME = { 64 },
    PAGES = { 4207-4224 },
    NUMBER = { 14 },
    ABSTRACT = { To investigate N metabolism of two contrasting Populus species in acclimation to low N availability, saplings of slow-growing species (Populus popularis, Pp) and a fast-growing species (Populus alba × Populus glandulosa, Pg) were exposed to 10, 100, or 1000 µM NH4NO 3. Despite greater root biomass and fine root surface area in Pp, lower net infuxes of NH4 + and NO3 - at the root surface were detected in Pp compared to those in Pg, corresponding well to lower NH4 + and NO3 - content and total N concentration in Pp roots. Meanwhile, higher stable N isotope composition (δ15N) in roots and stronger responsiveness of transcriptional regulation of 18 genes involved in N metabolism were found in roots and leaves of Pp compared to those of Pg. These results indicate that the N metabolism of Pp is more sensitive to decreasing N availability than that of Pg. In both species, low N treatments decreased net infuxes of NH 4 + and NO3 -, root NH 4 + and foliar NO3 - content, root NR activities, total N concentration in roots and leaves, and transcript levels of most ammonium (AMTs) and nitrate (NRTs) transporter genes in leaves and genes involved in N assimilation in roots and leaves. Low N availability increased fine root surface area, foliar starch concentration, δ15N in roots and leaves, and transcript abundance of several AMTs (e.g. AMT1;2) and NRTs (e.g. NRT1;2 and NRT2;4B) in roots of both species. These data indicate that poplar species slow down processes of N acquisition and assimilation in acclimation to limiting N supply. © The Author 2013. },
    COMMENT = { Export Date: 3 December 2013 Source: Scopus CODEN: JEBOA doi: 10.1093/jxb/ert234 },
    ISSN = { 00220957 (ISSN) },
    KEYWORDS = { Gene expression, Glutamate synthase, Glutamine synthetase, Net flux, Nitrate reductase, Nitrite reductase, Plasma membrane H+-ATPase, Poplar, Stable carbon isotope },
    OWNER = { Luc },
    TIMESTAMP = { 2013.12.03 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-84887972588&partnerID=40&md5=6f6149c64f6d7c79bb460d1c661a7df7 },
}

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