Roots alterations in presence of phenanthrene may limit co-remediation implementation with Noccaea caerulescens - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Environmental Science and Pollution Research Année : 2017

Roots alterations in presence of phenanthrene may limit co-remediation implementation with Noccaea caerulescens

Résumé

Co-phytoremediation of both trace elements and polycyclic aromatic hydrocarbons (PAH) is an emerging technique to treat multi-contaminated soils. In this study, root morphological and structural features of the heavy metal hyperaccumulator Noccaea caerulescens, exposed to a model PAH phenanthrene (PHE) in combination with cadmium (Cd), were observed. In vitro cultivated seedlings were exposed to 2 mM of PHE and/or 5 mu M of Cd for 1 week. Co-phytoremediation effectiveness appeared restricted because of a serious inhibition (about 40%) of root and shoot biomass production in presence of PHE, while Cd had no significant adverse effect on these parameters. The most striking effects of PHE on roots were a decreased average root diameter, the inhibition of cell and root hair elongation and the promotion of lateral root formation. Moreover, endodermal cells with suberin lamellae appeared closer to the root apex when exposed to PHE compared to control and Cd treatments, possibly due to modified lateral root formation. The stage with well-developed suberin lamellae was not influenced by PHE whereas peri-endodermal layer development was impaired in PHE-treated plants. Many of these symptoms were similar to a water-deficit response. These morphological and structural root modifications in response to PHE exposition might in turn limit Cd phytoextraction by N. caerulescens in co-contaminated soils.
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Dates et versions

hal-01611449 , version 1 (05-10-2017)

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Ivan Zelko, Stéphanie Ouvrard, Catherine Sirguey. Roots alterations in presence of phenanthrene may limit co-remediation implementation with Noccaea caerulescens. Environmental Science and Pollution Research, 2017, 24 (24), pp.19653-19661. ⟨10.1007/s11356-017-9592-2⟩. ⟨hal-01611449⟩
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