Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 733, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.139383
Keywords
Perfluoroalkyl substances; Wetland plants; Uptake mechanism; Subcellular distribution; Symplastic route
Categories
Funding
- National Natural Science Foundation of China [NSFC U1701242, U1401235, 51909107]
- Guangzhou Municipal Science and Technology Project [201504010007]
- Guangdong Provincial High-Level University Program [8s1001]
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Perfluoroalkyl substances (PFASs) are of particular environmental concern due to their environmental persistence and potential toxicity. Phytoremediation may be used to remove PFASs from wastewater. Here we investigated the uptake mechanism, subcellular distribution, and uptake process of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate acid (PFOS) in the wetland plant Alisma orientale by using a series of hydroponic experiments. Active uptake facilitated by water transporters and anion channels was involved in the uptake of PFASs by plant roots. PFOA and PFOS were mainly distributed in the water-soluble fraction (46.270.8%) and in cell walls (45.658.4%), respectively. The uptake process was proposed as follows: PFOS and PFOA were first distributed in the soluble fraction; a proportion of PFOS and PFOA were adsorbed gradually by the cell wall, and a proportion of PFOS and PFOA in the cell wall passed through the cell wall and plasmalemma and bind with organelles. PFOS and PFOA were transported from the external solution to the vascular bundle of the plant root through both symplastic and apoplastic routes.
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