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@ARTICLE{Wang:877544,
      author       = {Wang, Yi and Wu, Bei and Berns, Anne E. and Xing, Ying and
                      Kuhn, Arnd J. and Amelung, Wulf},
      title        = {{M}agnesium isotope fractionation reflects plant response
                      to magnesium deficiency in magnesium uptake and allocation:
                      a greenhouse study with wheat},
      journal      = {Plant and soil},
      volume       = {455},
      issn         = {0032-079X},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {FZJ-2020-02280},
      pages        = {93–105},
      year         = {2020},
      abstract     = {Aims Magnesium (Mg) deficiency is detrimental to plant
                      growth. However, how plants respond to Mg deficiency via
                      regulation of Mg uptake and allocation is yet not fully
                      understood. In this study, we tested whether Mg isotope
                      compositions (δ26Mg) associated with Mg mass balance of the
                      plants could be used as an indicator to trace Mg uptake and
                      subsequent translocation processes under sufficient and
                      low-Mg supply conditions. We aimed at using stable isotope
                      fractionation as a novel proxy for nutrient uptake and
                      cycling in plants.MethodsWe grew wheat plants (Triticum
                      aestivum) in a greenhouse under control (1 mM Mg) and low-Mg
                      supply (0.05 mM Mg) conditions, respectively. The Mg
                      concentrations and isotope compositions in roots, stems,
                      leaves and spikes/grains at different growth stages were
                      analyzed.ResultsWheat plants were systematically enriched in
                      heavy Mg isotopes relative to the nutrient solution
                      regardless of Mg supply conditions. With crop growth, the
                      δ26Mg of the whole plants, as well as each plant organ,
                      gradually shifted towards higher values in the control.
                      However, the δ26Mg value of the whole plants in the low-Mg
                      supply did not vary significantly. In addition, the wheat
                      stems and spikes showed continuous enrichment of lighter Mg
                      isotopes in the low-Mg supply than those in the
                      control.ConclusionsAs reflected from Mg isotope
                      compositions, the Mg supply in the growth media could affect
                      the Mg uptake and subsequent translocation processes in
                      plants. Changes in δ26Mg indicated that wheat plants likely
                      regulated their Mg uptake strategy by switching between
                      active and passive pathways during their life cycle. When Mg
                      supply was low, a more negative δ26Mg value of the spikes
                      suggested a potentially enhanced remobilization of Mg from
                      leaves to spikes. Our results showed that Mg stable isotopes
                      can provide new insights into plants’ response to nutrient
                      shortage.},
      cin          = {IBG-2 / IBG-3},
      ddc          = {580},
      cid          = {I:(DE-Juel1)IBG-2-20101118 / I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000560907800003},
      doi          = {10.1007/s11104-020-04604-2},
      url          = {https://juser.fz-juelich.de/record/877544},
}