Ecophysiologie de la phytoaccumulation du cadmium pour quelques populations de la plante hyperaccumulatrice Noccaea (Thlaspi) caerulescens

Abstract : The use of hyperaccumulator plants is a promising biological process of cleaning up contaminated soil in trace metals. This technique is not operational due to the small size of hyperaccumulator plants, the high intraspecific diversity of hyperaccumulation. The objective of this study is to participate in reasoned choice of a Noccaea caerulescens ecotype. For this, four populations were selected. The germination test and controlled crop in sand fertilized, contaminated or not cadmium, were performed. Morphometric, ecophysiological and chemical parameters were estimated at different time scales. Concentrations of metals and nutrients were determined in the leaf biomass and the corresponding solution of the sand, which allowed us to calculate relevant bioconcentration factors taking into account both the ecophysiology of metal phytoaccumulation and metal availability. The seeds from the nonmetalliferous soil and that of the nickel-rich soil have sprouted, the resolution of this problem can be seen with the addition of gibberellic acid. From the perspective of phytoremediation of contaminated soil in metals, it is much preferred the CAL2 metalliferous population compared to the CAL1 metalliferous population for its greater Zn and Cd phytoaccumulation in leaves due to (i) its better growth, correlated with better use of water for photosynthesis for the whole culture or at the short time of gas exchanges of the aerial part of the plant, and (ii) a predominance of higher active transport of Zn or Cd. These ecophysiological approaches could be used profitably in a significant number of Noccaea caerulescens ecotypes in order to select a limited number of these rational basis with a view to breeding.
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Master thesis
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http://docnum.univ-lorraine.fr/public/SCDSCI_M_2011_UBERSFELD_DIMITRI.pdf
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Dimitri Ubersfeld. Ecophysiologie de la phytoaccumulation du cadmium pour quelques populations de la plante hyperaccumulatrice Noccaea (Thlaspi) caerulescens. Sciences de l'environnement. 2011. ⟨hal-01877198⟩

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