Lead-induced oxidative stress triggers root cell wall remodeling and increases lead absorption through esterification of cell wall polysaccharide.

Autor: Zhang J; College of Resources and Environmental Science, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, PR China; Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, The Chinese Academy of Science, Wuhan, PR China., Qian Y; Shenzhen Key Laboratory of Environmental Chemistry and Ecological Remediation, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, PR China., Chen Z; Department of Applied Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Czech Republic., Amee M; Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, The Chinese Academy of Science, Wuhan, PR China., Niu H; College of Resources and Environmental Science, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, PR China., Du D; College of Resources and Environmental Science, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, PR China., Yao J; School of Water Resources & Environment, China University of Geosciences Beijing, Beijing, PR China., Chen K; College of Resources and Environmental Science, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, PR China. Electronic address: kechen@mail.scuec.edu.cn., Chen L; Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, The Chinese Academy of Science, Wuhan, PR China. Electronic address: chenliang1034@126.com., Sun J; College of Resources and Environmental Science, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, PR China. Electronic address: jetsun@mail.scuec.edu.cn.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2020 Mar 05; Vol. 385, pp. 121524. Date of Electronic Publication: 2019 Oct 31.
DOI: 10.1016/j.jhazmat.2019.121524
Abstrakt: Tall fescue (Festuca arundinacea Schreb) shows remarkable tolerance to lead (Pb), but the mechanisms involved in metal tolerance are not yet well understood. Here, tall fescue were firstly cultivated hydroponically with Pb 2+ (0, 50, 200 and 1000 mg/L) for 14 days. The results showed that remodeling of root architecture plays important roles in tolerance of tall fescue to Pb 2+ stress. Increased cell wall (CW) components contribute to restrict high amount of Pb 2+ in roots. Additionally, the uronic acid contents of pectin, hemicellulose 1 (HC1) and hemicellulose 2 (HC2) increased under Pb 2+ stress. We further observed that tall fescue cultivated with H 2 O 2 showed similar remodeling of root architecture as Pb 2+ treatment. Furthermore, pectin, HC1 and HC2 fractions were sequentially extracted from 0 and 10 mM H 2 O 2 treated roots, and Pb 2+ adsorption capacity and contents of carboxyl groups of pectin and HC2 fractions were steadily increased under H 2 O 2 treatment in vitro. Our results suggest that degrees of esterification of pectin and HC2 are regulated by H 2 O 2 . High amount of low-esterified pectin and HC2 offer more carboxyl groups, provide more Pb 2+ binding sites, and restrict more Pb 2+ in the CW, which may enhance tolerance of tall fescue to Pb 2+ stress.
(Copyright © 2019 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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