Compréhension de la répartition et de la concentration des éléments traces dans les organes de plantes cultivées pour l'alimentation : influence de l'allométrie et du stade de développement

Abstract : This work is focuded on the accumulation of essential and non-essential elements, paying a special attention to the dible part of the plants, in terms of food safety and human health. The thesis work has been divided in two main parts. The first one is related to a field expeiment performed in open-air plots, where Swiss chards and tomato plants were grown from seedlings to maturity in a natural soil during five months, using organic or conventional agricultural practices. Plants were harvested at six different growth satges and the total concentrations of 27 elements were measured in all plants organs. The objective was to study the partitioning of elements between the plant organs, depending on the plant age on the cultivation practice. The second part of the thesis is devoted to the understanding and modelling of the partitioning of cadmium (Cd) in sunflowers at the reproductive stages. Sunflowers wre grown in nutrient solution at low Cd availability consistent with thaht found in the field, from germination toi maturity. During the reproductive period, five samplings were carried out to investigate the partitioning of the total Cd between plant organs and the origin of the Cd allocated to seeds (root uptake vs; remobilization from other plant organs). At the flower bud and grain filling stages, the partitioning of the Cd recently taken up between the different plant organs was followed and modelled by exposing several plants for the three days to a 111Cd enriched nutrient solution. The roles of the transpiration and of the plant allometry were specially investigated.
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Olaia Liñero Campo. Compréhension de la répartition et de la concentration des éléments traces dans les organes de plantes cultivées pour l'alimentation : influence de l'allométrie et du stade de développement. Ecotoxicology. Université de Bordeaux, 2016. English. ⟨NNT : 2016BORD0049⟩. ⟨tel-01344615⟩

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