NGUYEN, Christophe; SOULIER, Anne-Julie; MASSON, Pierre; BUSSIERE, Sylvie; CORNU, Jean-Yves

doi:10.1007/s11356-015-5782-y

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NGUYEN, Christophe
Interactions Sol Plante Atmosphère [UMR ISPA]

SOULIER, Anne-Julie
Interactions Sol Plante Atmosphère [UMR ISPA]

MASSON, Pierre
Unité de service et de recherches en analyses végétales et environnementales [USRAVE]

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Environmental Science and Pollution Research. 2016, vol. 23, n° 4, p. 3152-3164

Springer Verlag

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This work focuses on the exposure of maize plants to nanomolar concentrations of Cd, which is relevant for agricultural soils cropped with food and feed plants. Maize plants were cultivated in nutrient solution at 0.8 or 20 nM Cd during the vegetative growth stages. No significant hormesis or toxic effects of Cd were observed on maize growth, but a decrease in the allocation of Cd to shoots between the 0.8 and 20 nM Cd exposures revealed that the plants already responded to these low concentrations of Cd according to a shoot Cd excluder strategy. The Cd, Cu and Zn concentrations in shoots decreased with time as the result of an early decrease in the root/shoot ratio and of a decrease in the coefficient of allocation to aboveground for Zn and Cd at 20 nM. As a consequence, shoots of young plants were richer in micronutrients Cu and Zn but also in toxic Cd. The rate of delivery of Cd, Cu and Zn from xylem sap was successfully used to predict the time course of concentrations of Cd, Cu and Zn in the shoot. However, it overestimated the actual concentrations of Cd in the shoot, presumably because the reallocation of this trace element from shoots back to roots was not taken into account.< Réduire

Mots clés en anglais

trace elements

zinc

partitioning

xylem sap

cadmium

dilution

copper

growth

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Accumulation of Cd, Cu and Zn in shoots of maize (Zea mays L.) exposed to 0.8 or 20 nM Cd during vegetative growth and the relation with xylem sap composition

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