Tight control of nitrate acquisition in a plant species that evolved in an extremely phosphorus-impoverished environment

M. Asaduzzaman Prodhan, Ricarda Jost, Mutsumi Watanabe, Rainer Hoefgen, Hans Lambers, Patrick M. Finnegan

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    17 Citations (Scopus)
    263 Downloads (Pure)

    Abstract

    Hakea prostrata (Proteaceae) has evolved in an extremely phosphorus (P)-limited environment. This species exhibits an exceptionally low ribosomal RNA (rRNA) and low protein and nitrogen (N) concentration in its leaves. Little is known about the N requirement of this species and its link to P metabolism, despite this being the key to understanding how it functions with a minimal P budget. H. prostrata plants were grown with various N supplies. Metabolite and elemental analyses were performed to determine its N requirement. H. prostrata maintained its organ N content and concentration at a set point, independent of a 25-fold difference nitrate supplies. This is in sharp contrast to plants that are typically studied, which take up and store excess nitrate. Plants grown without nitrate had lower leaf chlorophyll and carotenoid concentrations, indicating N deficiency. However, H. prostrata plants at low or high nitrate availability had the same photosynthetic pigment levels and hence were not physiologically compromised by the treatments. The tight control of nitrate acquisition in H. prostrata retains protein at a very low level, which results in a low demand for rRNA and P. We surmise that the constrained nitrate acquisition is an adaptation to severely P-impoverished soils.

    Original languageEnglish
    Pages (from-to)2754-2761
    Number of pages8
    JournalPlant Cell and Environment
    Volume39
    Issue number12
    Early online date2 Nov 2016
    DOIs
    Publication statusPublished - 1 Dec 2016

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