Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 46, Issue -, Pages 16-27Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2015.08.029
Keywords
Metallic particles; Vegetables; Foliar uptake; Transfer kinetics and phytotoxicity
Categories
Funding
- Chinese government
- Ademe (the French Agency of Sustainable Development and Energy) through the DIMENSION project
- National Research Agency [ANR-12-0011-VBDU]
- National Polytechnic Institute in Toulouse (INPT)
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At the global scale, foliar metal transfer occurs for consumed vegetables cultivated in numerous urban or industrial areas with a polluted atmosphere. However, the kinetics of metal uptake, translocation and involved phytotoxicity was never jointly studied with vegetables exposed to micronic and sub-micronic particles (PM). Different leafy vegetables (lettuces and cabbages) cultivated in RHIZOtest (R) devices were, therefore, exposed in a greenhouse for 5, 10 and 15 days to various PbO PM doses. The kinetics of transfer and phytotoxicity was assessed in relation to lead concentration and exposure duration. A significant Pb accumulation in leaves (up to 7392 mg/kg dry weight (DW) in lettuce) with translocation to roots was observed. Lead foliar exposure resulted in significant phytotoxicity, lipid composition change, a decrease of plant shoot growth (up to 68.2% in lettuce) and net photosynthesis (up to 58% in lettuce). The phytotoxicity results indicated plant adaptation to Pb and a higher sensitivity of lettuce in comparison with cabbage. Air quality needs, therefore, to be considered for the health and quality of vegetables grown in polluted areas, such as certain megacities (in China, Pakistan, Europe, etc.) and furthermore, to assess the health risks associated with their consumption. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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