Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 66, Issue 50, Pages 13096-13106Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.8b04548
Keywords
perfluorooctanesulfonate (PFOS); lettuce (Lactuca sativa L.); cultivar variation; low-PFOS accumulator; transpiration; protein
Funding
- National Natural Science Foundation of China [41573093, 41807339]
- NSFC-Guangdong Joint Fund [U1501233]
- Research Team Project of the Natural Science Foundation of Guangdong Province [2016A030312009]
- Science and Technology Project of Guangzhou City [20170420074]
- Program of the Guangdong Science and Technology Department [2016B020242005, 2017B020238002]
- Special Fund of Guangdong Province for Science, Technology, and Innovation [2018A030310629]
- Science and Technology Project of Guangzhou Water Resources Bureau [GZCPJ/YB-2016-15]
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Perfluorooctanesulfonate (PFOS) is a toxic and persistent organic pollutant that can be widely detected in agricultural soils. In this study, two lettuce cultivars with low PFOS accumulation were screened out to reduce the exposure of PFOS to the human body via vegetable consumption. The screened low-PFOS cultivars may help to ensure food safety, despite planting in highly PFOS-polluted soils (1.0 mg/kg), due to their high tolerance to PFOS and 4.4-5.7 times lower shoot PFOS concentration than the high-PFOS cultivars. Protein content and protein-mediated transpiration played key roles in regulating PFOS accumulation in the lettuce cultivars tested. Lower protein content, lower stomatal conductance, and lower transpiration rate resulted in low PFOS accumulation. This study reveals the mechanism of forming low-PFOS accumulation of lettuce cultivars at physiological and biochemical levels and lays a foundation for developing a cost-effective and safe approach to grow vegetables in PFOS-polluted soils.
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