Kinetic study of phytotoxicity induced by foliar lead uptake for vegetables exposed to fine particles and implications for sustainable urban agriculture  

作　　者：TianTian Xiong Annabelle Austruy Antoine Pierart Muhammad Shahid Eva Schreck Stéphane Mombo Camille Dumat 

机构地区：[1]Université de Toulouse, Institut National Polytechnique de Toulouse-Ecole Nationale Supérieure Agronomique de Toulouse (INP-ENSAT) [2]Centre National de la Recherche Scientifique [3]Institut Ecocitoyen, Centre de Vie la Fossette RD 268 [4]Department of Environmental Sciences, COMSATS Institute of Information Technology [5]Géosciences Environnement Toulouse (GET),Observatoire Midi Pyrénées, Université de Toulouse [6]Centre d'Etude et de Recherche Travail Organisation Pouvoir (CERTOP),UMR5044, Universite J. Jaurès - Toulouse II

出　　处：《Journal of Environmental Sciences》2016年第8期16-27,共12页环境科学学报（英文版）

基　　金：financial support from Ademe(the French Agency of Sustainable Development and Energy)through the"DIMENSION"project;the National Research Agency under reference ANR-12-0011-VBDU;the National Polytechnic Institute in Toulouse(INPT)

摘　　要：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？ devices were, therefore, exposed in a greenhouse for 5, 10 and 15 days to various Pb O 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.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？ devices were, therefore, exposed in a greenhouse for 5, 10 and 15 days to various Pb O 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.

关 键 词：Metallic particles Vegetables Foliar uptake Transfer kinetics and phytotoxicity 

分 类 号：X56[环境科学与工程—环境工程]