Accumulation and distribution of Zn in the shoots and reproductive structures of the halophyte plant species Kosteletzkya virginica as a function of salinity

Han, Ruiming;Quinet, Muriel;Andre, Emilie;van Elteren, Johannes Teun;Lutts, Stanley;et.al.
(2013) Planta : an international journal of plant biology — Vol. 238, n° 3, p. 441-457 (2013)

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Authors
  • Han, RuimingUCLouvain
    Author
  • Quinet, MurielUCLouvain
    Author
  • Andre, EmilieUCLouvain
    Author
  • van Elteren, Johannes TeunNational Institute of Chemistry, Ljubjana
    Author
  • Destrebecq, FlorenceUCLouvain
    Author
  • Cui, GuanglingUCLouvain
    Author
  • Lefèvre, Isabelle S.UCLouvain
    Author
  • Lutts, StanleyUCLouvain
    Author
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Abstract
Kosteletzkya virginica is a wetland halophyte that is a good candidate for rehabilitation of degraded salt marshes and production of oil as biodiesel. Salt marshes are frequently contaminated by heavy metals. The distribution of Zn in vegetative and reproductive organs of adult plants,and the NaCl influence on this distribution remain unknown and were thus explored in the present study. Plants were cultivated in a nutrient film technique system,from seedling stage until seed maturation in a control, Zn (100 lM), NaCl (50 mM) or Zn ? NaCl medium. Photosynthesis,ion nutrition, malondialdehyde and non-proteinthiol concentrations were quantified. Zinc distribution in reproductive organs was estimated by a laser ablationinductively coupled plasma-mass spectrometry procedure(LA-ICP-MS). Adult plants accumulated up to 2 mg g-1 DW Zn in the shoots. Zinc reduced plant growth, inhibited photosynthesis and reduced seed yield. Zinc accumulation in the seeds was only two times higher in Zn-treated plants than in controls. Exogenous NaCl neutralized the damaging action of Zn and modified the Zn distribution through a preferential accumulation of toxic ions in older leaves. Zinc was present in seed testa, endosperm and, to a lower extent, in embryo. Additional NaCl induced a chalazal retention of Zn during seed maturation and reduced final Zn seed content. It is concluded that NaCl 50 mM had a positive impact on the response of K. virginica to Zn toxicity and acts through a modification in Zn distribution rather than a decrease in Zn absorption.
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Han, R., Quinet, M., Andre, E., van Elteren, J. T., Destrebecq, F., Vogel-Mikus, K., Cui, G., Debeljak, M., Lefèvre, I. S., & Lutts, S. (2013). Accumulation and distribution of Zn in the shoots and reproductive structures of the halophyte plant species Kosteletzkya virginica as a function of salinity. Planta : an international journal of plant biology, 238(3), 441-457. https://doi.org/10.1007/s00425-013-1903-3 (Original work published 2013)