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Soil type and growing conditions influence uptake and translocation of organochlorine (chlordecone) by cucurbitaceae species

Clostre F., Letourmy P., Turpin B., Carles C., Lesueur Jannoyer M.. 2014. Water, Air and Soil Pollution, 225 (ID 2153) : 11 p..

Chlordecone (CLD), an organochlorine insecticide, and other persistent organic pollutants continue to contaminate the environment worldwide and have adverse effects on human health through food exposure. Cucurbitaceae take up weathered hydrophobic pollutants from the soil and translocate them to their shoots. As Cucurbitaceae are an important part of the diet in the French West Indies, they are among the main contributors to total dietary intake of CLD. We analyzed the contamination by CLDs (CLD and 5b-hydroCLD) of four cucurbits grown in the field and/or in the greenhouse. Different physiological (crop species) and environmental (soil type, growth conditions) variables were shown to influence uptake of the pollutant from the soil by the crop. Cucurbita species (zucchini and pumpkin) were more contaminated than Cucumis sativus (cucumber), and Sechium edule (christophine or chayote) translocated CLDs to fruits very poorly compared with cucumber and pumpkin. Greenhouse conditions and non-allophanic (nitisols and ferralsols) soils favored plant contamination more than field conditions and allophanic soils (andosols). (Résumé d'auteur)

Mots-clés : cucurbitaceae; cucurbita; cucumis sativus; sechium edule; contamination chimique; composé organohalogène; absorption; sol pollué; chlordécone; type de sol; martinique

Thématique : Chimie et physique du sol; Culture des plantes; Physiologie et biochimie végétales; Pollution

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