Influence of root exudation of white lupine (Lupinus albus L.) on uranium phytoavailability in a naturally uranium-rich soil

Abstract

To cite this version:Pascale Henner, Félix Bredoire, Antoine Tailliez, Frederic Coppin, Sylvie Pierrisnard, et al.. Influence of root exudation of white lupine (Lupinus albus L.) on uranium phytoavailability in a naturally uranium-rich soil . Journal of Environmental Radioactivity, Elsevier, 2018Elsevier, , 190-191, pp.39-50. 10.1016Elsevier, /j.jenvrad.2018 Influence of root exudation of white lupine (Lupinus albus L.) on uranium 1 phytoavailability in a naturally uranium-rich soil 2 Mechanisms of uranium (U) transfer from soil to plants remain poorly understood. The 35 kinetics of supply of U to the soil solution from solid phases could be a key point to 36 understand its phytoavailability and implications for environmental risk assessment. Root 37 activity, particularly the continuous release of organic acids in the rhizosphere, could have an 38 effect on this supply. We tested the impact of citrate exudation by roots of Lupinus albus, 39 either P-sufficient (P+) or P-deficient (P-), on the phytoavailability of U from a naturally 40 contaminated soil (total content of 413 mg U kg -1 ) using a rhizotest design. Combined effects 41 of P (P-/P+ used to modulate plant physiology) and citrate (model exudate) on the 42 solubilization of U contained in the soils were tested in closed reactors (batch). The batch 43 experiment showed the existence of a low U available pool (0.4% total U) and high 44

Efficiency of dihydroxamic and trihydroxamic siderochelates to extract uranium and plutonium from contaminated soils

“…Both elements are known to be poorly mobile in soils and our results confirmed this finding. The amount of U in solution is comparable with the value found by Henner et al (2018) for the same soils (slightly less than 0.5%) after an extraction period of 5 days with a mineral plant nutrient solution. It also falls within the ranges observed for a natural Belgian soil (Vandenhove et al, 2014), for samples collected at a waste disposal site in India (Rout et al, 2015), at the Oak Ridge (USA) contaminated area (Zheng and Wan, 2005), and at U mill tailings (Liu et al, 2017).…”

“…Two samples, denoted hereafter as soil 1 and soil 2, have been collected in the A horizon of the soils (0-15 cm following removal of the OL horizon, according to the classification proposed by Jabiol et al, 2013), homogenized, dried at room temperature, and sieved at 2 mm before use. The essential physico-chemical characteristics of both samples are reported in Table 1 (Henner et al, 2018).…”

Expression of Cytochrome c3 from Desulfovibrio vulgaris in Plant Leaves Enhances Uranium Uptake and Tolerance of Tobacco

“…There, pictures of the control root cells have black needle-shaped and flaky crystals. These are apparently made from uranyl ion complexes with organic acids secreted by cells [ 9 ] and these crystals are located at or near the plasma membranes ( Figure 4 a). Untransformed leaves had neither crystals of any kind, nor any dark areas between chloroplast membranes ( Figure 4 b).…”

“…Uranium, however, is an especially difficult metal to bioremediate. Uranium uptake by plants is greatly dependent on either secreted [ 9 ] or externally added [ 10 ] organic anions, citrate or lactate. Specific pathways of uranium uptake and translocation by plants remain to be elucidated.…”

Benzotriazole Uptake and Removal in Vegetated Biofilter Mesocosms Planted with Carex praegracilis

“…The steady decrease of both BT pore water concentration and pore water mass distribution over the course of the study suggests that the bioavailability of BT should decrease. However, the steady in planta concentrations of BT and GBT indicate that C. praegracilis increases the phytoavailability of BT, perhaps by releasing exudates into the rhizosphere that facilitate the desorption of BT, a phenomenon commonly observed with nutrients [56,57]. While plants typically release exudates in order to facilitate the uptake of deficient nutrients, the released exudates can impact chemistry in the rhizosphere, often allowing for the increased phytoavailability of contaminants including metals [58,59] and PAHs [60].…”