Root-zone regulation and longitudinal translocation cause intervarietal differences for phthalates accumulation in vegetables

Selecting and cultivating low-accumulating crop varieties (LACVs) is the most effective strategy for the safe utilization of di-(2-ethylhexyl) phthalate (DEHP)-contaminated soils, promoting cleaner agricultural production. However, the adsorption-absorption-translocation mechanisms of DEHP along the...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2024-07, Vol.359, p.142322-142322, Article 142322
Main Authors: Pan, Bogui, Zhu, Xiaoqiong, Huang, Li, Cai, Kunzheng, Li, Yan-Wen, Cai, Quan-Ying, Feng, Nai-Xian, Mo, Ce-Hui
Format: Article
Language:English
Subjects:
Adsorption-absorption-translocation
Food safety
Phthalate esters (PAEs)
Variety difference
Vegetable
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Summary:Selecting and cultivating low-accumulating crop varieties (LACVs) is the most effective strategy for the safe utilization of di-(2-ethylhexyl) phthalate (DEHP)-contaminated soils, promoting cleaner agricultural production. However, the adsorption-absorption-translocation mechanisms of DEHP along the root-shoot axis remains a formidable challenge to be solved, especially for the research and application of LACV, which are rarely reported. Here, systematic analyses of the root surface ad/desorption, root apexes longitudinal allocation, uptake and translocation pathway of DEHP in LACV were investigated compared with those in a high-accumulating crop variety (HACV) in terms of the root-shoot axis. Results indicated that DEHP adsorption was enhanced in HACV by root properties, elemental composition and functional groups, but the desorption of DEHP was greater in LACV than HACV. The migration of DEHP across the root surface was controlled by the longitudinal partitioning process mediated by root tips, where more DEHP accumulated in the root cap and meristem of LACV due to greater cell proliferation. Furthermore, the longitudinal translocation of DEHP in LACV was reduced, as evidenced by an increased proportion of DEHP in the root apoplast. The symplastic uptake and xylem translocation of DEHP were suppressed more effectively in LACV than HACV, because DEHP translocation in LACV required more energy, binding sites and transpiration. These results revealed the multifaceted regulation of DEHP accumulation in different choysum (Brassica parachinensis L.) varieties and quantified the pivotal regulatory processes integral to LACV formation. [Display omitted] •Root traits determined the DEHP adsorption capacity on root surfaces.•DEHP showed high affinity for the root cap and meristem of root apexes.•The low-accumulating crop variety (LACV) had a greater root retention capacity for DEHP.•DEHP translocation in the LACV depends more on energy, binding sites and transpiration.•The fate of DEHP on the root-shoot axis caused variation formation.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2024.142322