Influence of fine process particles enriched with metals and metalloids on Lactuca sativa L. leaf fatty acid composition following air and/or soil-plant field exposure

Eva Schreck (1, 2) , Christophe Laplanche (1) , Marina Le Guédard (3) , Jean-Jacques Bessoule (3) , Annabelle Austruy (1) , Tiantian Xiong (1) , Yann Foucault (1) , Camille Dumat (1)

1 LEFE - Laboratoire Ecologie Fonctionnelle et Environnement
2 GET - Géosciences Environnement Toulouse
3 LBM - Laboratoire de biogenèse membranaire

We investigate the effect of both foliar and root uptake of a mixture of metal(loid)s on the fatty acid composition of plant leaves. Our objectives are to determine whether both contamination pathways have a similar effect and whether they interact. Lactuca sativa L. were exposed to fine process particles enriched with metal(loid)s in an industrial area. Data from a first experiment were used to conduct an exploratory statistical analysis which findings were successfully cross-validated by using the data from a second one. Both foliar and root pathways impact plant leaf fatty acid composition and do not interact. Z index (dimensionless quantity), weighted product of fatty acid concentration ratios was built up from the statistical analyses. It provides new insights on the mechanisms involved in metal uptake and phytotoxicity. Plant leaf fatty acid composition is a robust and fruitful approach to detect and understand the effects of metal(loid) contamination on plants.

Mots clés: Mixture of metal(loid)s; Leaf fatty acid composition; Statistical index; Uptake pathways

Domaines: Ecologie, Environnement

Eva Schreck, Christophe Laplanche, Marina Le Guédard, Jean-Jacques Bessoule, Annabelle Austruy, et al.. Influence of fine process particles enriched with metals and metalloids on Lactuca sativa L. leaf fatty acid composition following air and/or soil-plant field exposure. Environmental Pollution, 2013, 179, pp.242-249. ⟨10.1016/j.envpol.2013.04.024⟩. ⟨hal-00862290⟩