PngTurnerAlbornozEtAl2017

Référence

Png, G.K., Turner, B.L., Albornoz, F.E., Hayes, P.E., Lambers, H. and Laliberté, E. (2017) Greater root phosphatase activity in nitrogen-fixing rhizobial but not actinorhizal plants with declining phosphorus availability. Journal of Ecology, 105(5):1246-1255. (Scopus )

Résumé

The abundance of nitrogen (N)-fixing plants in ecosystems where phosphorus (P) limits plant productivity poses a paradox because N fixation entails a high P cost. One explanation for this paradox is that the N-fixing strategy allows greater root phosphatase activity to enhance P acquisition from organic sources, but evidence to support this contention is limited. We measured root phosphomonoesterase (PME) activity of 10 N-fixing species, including rhizobial legumes and actinorhizal Allocasuarina species, and eight non-N-fixing species across a retrogressive soil chronosequence showing a clear shift from N to P limitation of plant growth and representing a strong natural gradient in P availability. Legumes showed greater root PME activity than non-legumes, with the difference between these two groups increasing markedly as soil P availability declined. By contrast, root PME activity of actinorhizal species was always lower than that of co-occurring legumes and not different from non-N-fixing plants. The difference in root PME activity between legumes and actinorhizal plants was not reflected in a greater or similar reliance on N fixation for N acquisition by actinorhizal species compared to co-occurring legumes. Synthesis. Our results support the idea that N-fixing legumes show high root phosphatase activity, especially at low soil P availability, but suggest that this is a phylogenetically conserved trait rather than one directly linked to their N-fixation capacity. © 2017 The Authors. Journal of Ecology © 2017 British Ecological Society

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@ARTICLE { PngTurnerAlbornozEtAl2017,
    AUTHOR = { Png, G.K. and Turner, B.L. and Albornoz, F.E. and Hayes, P.E. and Lambers, H. and Laliberte, E. },
    TITLE = { Greater root phosphatase activity in nitrogen-fixing rhizobial but not actinorhizal plants with declining phosphorus availability },
    JOURNAL = { Journal of Ecology },
    YEAR = { 2017 },
    VOLUME = { 105 },
    NUMBER = { 5 },
    PAGES = { 1246-1255 },
    NOTE = { cited By 0 },
    ABSTRACT = { The abundance of nitrogen (N)-fixing plants in ecosystems where phosphorus (P) limits plant productivity poses a paradox because N fixation entails a high P cost. One explanation for this paradox is that the N-fixing strategy allows greater root phosphatase activity to enhance P acquisition from organic sources, but evidence to support this contention is limited. We measured root phosphomonoesterase (PME) activity of 10 N-fixing species, including rhizobial legumes and actinorhizal Allocasuarina species, and eight non-N-fixing species across a retrogressive soil chronosequence showing a clear shift from N to P limitation of plant growth and representing a strong natural gradient in P availability. Legumes showed greater root PME activity than non-legumes, with the difference between these two groups increasing markedly as soil P availability declined. By contrast, root PME activity of actinorhizal species was always lower than that of co-occurring legumes and not different from non-N-fixing plants. The difference in root PME activity between legumes and actinorhizal plants was not reflected in a greater or similar reliance on N fixation for N acquisition by actinorhizal species compared to co-occurring legumes. Synthesis. Our results support the idea that N-fixing legumes show high root phosphatase activity, especially at low soil P availability, but suggest that this is a phylogenetically conserved trait rather than one directly linked to their N-fixation capacity. © 2017 The Authors. Journal of Ecology © 2017 British Ecological Society },
    AFFILIATION = { School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley (Perth), WA, Australia; Smithsonian Tropical Research Institute, Apartado, Balboa, Ancon, Panama; Centre sur la Biodiversité, Institut de Recherche en Biologie Végétale, Département de Sciences Biologiques, Université de Montréal, 4101 Sherbrooke Est, Montréal, QC, Canada },
    AUTHOR_KEYWORDS = { Fabaceae; nitrogen paradox; nutrient-acquisition strategies; organic phosphorus; phosphomonoesterase; plant–soil (below-ground) interactions; soil chronosequence },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1111/1365-2745.12758 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85016622793&doi=10.1111%2f1365-2745.12758&partnerID=40&md5=4ddd329418d727b01490606a7babaa3a },
}

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