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From the same journal

Uptake kinetics and accumulation of pesticides in wheat (Triticum aestivum L.): Impact of chemical and plant properties

Research output: Contribution to journalArticlepeer-review

Published copy (DOI)

Author(s)

  • Qianyu Liu
  • Yingchao Liu
  • Fengshou Dong
  • J. Brett Sallach
  • Xiaohu Wu
  • Xingang Liu
  • Jun Xu
  • Yongquan Zheng
  • Yuanbo Li

Department/unit(s)

Publication details

JournalEnvironmental Pollution
DateAccepted/In press - 29 Jan 2021
DateE-pub ahead of print - 4 Feb 2021
DatePublished (current) - 15 Apr 2021
Volume275
Early online date4/02/21
Original languageEnglish

Abstract

Plant uptake is an important process in determining the transfer of pesticides through a food chain. Understanding how crops take up and translocate pesticides is critical in developing powerful models to predict pesticide accumulation in agricultural produce and potential human exposure. Herein, wheat was selected as a model plant species to investigate the uptake and distribution of eleven widely used pesticides in a hydroponic system as a function of time for 144 h. The time-dependent uptake kinetics of these pesticides were fitted with a first-order 1-compartment kinetic model. During 144 h, flusilazole and difenoconazole, with relative high log Kow (3.87 and 4.36, respectively), displayed higher root uptake rate constants (k). To clarify the role of root lipid content (flip) in plant accumulation of pesticides, we conducted a lipid normalization meta-analysis using data from this and previous studies, and found that the flip value was an important factor in predicting the root concentration factor (RCF) of pesticides. An improved correlation was observed between log RCF and log flipKow (R2 = 0.748, N = 26, P < 0.001), compared with the correlation between log RCF and log Kow (R2 = 0.686, N = 26, P < 0.001). Furthermore, the hydrophilic pesticides (e.g. log Kow < 2) were found to reach partition equilibrium faster than lipophilic pesticides (e.g. log Kow > 3) during the uptake process. The quasi-equilibrium factor (αpt) was inversely related to log Kow (R2 = 0.773, N = 11, P < 0.001) suggesting a hydrophobicity-regulated uptake equilibrium. Findings from this study could facilitate crop-uptake model optimization. Integrating the pesticide Kow with plant root lipid content (flipKow) is better for predicting the root concentration factors of pesticides than just Kow.

Bibliographical note

© 2021 Elsevier Ltd. All rights reserved. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.

Funding Information:
This works was supported by the National Key Research and Development Program of China ( 2019YFC1604503 ), National Natural Science Foundation of China ( 31872004 ), and Hebei Provincial Department of Education’s Graduate Student Innovative Ability Training Funding Project ( CXZZBS2020100 ).

Publisher Copyright:
© 2021 Elsevier Ltd

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

    Research areas

  • Pesticides, Root concentration factor, Root lipid content, Translocation, Uptake kinetics

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