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Metalliferous soils are characterized by a high content of metal compounds that can hamper plant growth. The pseudometallophyte  Noccaea caerulescens  is able to grow on metalliferous substrates by implementing both tolerance and accumulation of usually toxic metal ions. Expression of particular transmembrane transporter proteins (e.g., members of the ZIP and NRAMP families) leads to metal tolerance and accumulation, and its comparison between hyperaccumulator  N. caerulescens  with non-accumulator relatives  Arabidopsis thaliana  and  Thlaspi arvense  has deepened our knowledge on mechanisms adopted by plants to survive in metalliferous soils. In this work, two transporters,  ZNT1  and  NRAMP4,  expressed in a serpentinic population of  N. caerulescens  identified on the Monte Prinzera (Italy) are considered, and their expression has been induced in yeast and in  A. thaliana . In the latter, single transgenic lines were crossed to test the effect of the combined over-expression of the two transporters. An enhanced iron and manganese translocation towards the shoot was induced by overexpression of  NcZNT1 . The combined overexpression of  NcZNT1  and  NcNRAMP4  did perturb the metal accumulation in plants.

international journal of molecular sciences

Overexpression of ZNT1 and NRAMP4 from the Ni Hyperaccumulator Noccaea caerulescens Population Monte Prinzera in Arabidopsis thaliana Perturbs Fe, Mn, and Ni Accumulation