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Research article - Peer-reviewed, 2021

Tolerance and detoxification mechanisms to cadmium stress by hyperaccumulator Erigeron annuus include molecule synthesis in root exudate

Zhang, Hong; Heal, Kate; Zhu, Xiangdong; Tigabu, Mulualem; Xue, Yanan; Zhou, Chuifan

Abstract

Cadmium (Cd) is one of the most toxic environmental pollutants affecting the growth and reproduction of various plants. Analysis of the biological adaptation and tolerance mechanisms of the hyperaccumulator Erigeron annuus to Cd stress may help identify new plant species for phytoremediation and in optimizing the process. This study is to the first to analyze the molecular composition and diversity of dissolved organic matter (DOM) secreted by roots using FT-ICR MS, and multiple physiological and biochemical indexes of E. annuus seedlings grown in solutions containing 0-200 Cd mu mol L-1. The results showed that E. annuus had strong photosynthetic adaptation and protection ability under Cd stress. Cd was immobilized or compartmentalized by cell walls and vacuoles in the plant, thus alleviating Cd stress. Activation of anti-oxidation defense mechanisms also played an important role in alleviating or eliminating Cd toxicity in E. annuus. High Cd stress promoted production of a higher proportion of new molecules in DOM secreted by E. annuus roots compared to low Cd stress. DOM secreted by roots contributed to plant resistance to Cd-induced stress via producing more carbohydrates, aromatic structures and tannins. Results indicate the mechanisms underpinning the potential use of E. annuus as a phytoremediator in environments with moderate Cd pollution.

Keywords

Antioxidants; Cadmium stress; Dissolved organic matter; FT-ICR MS; Proline

Published in

Ecotoxicology and Environmental Safety
2021, volume: 219, article number: 112359
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE

Authors' information

Zhang, Hong
Fujian Agriculture and Forestry University
Heal, Kate
University of Edinburgh
Zhu, Xiangdong
Fudan University
Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre
Xue, Yanan
Fujian Agriculture and Forestry University
Zhou, Chuifan
Fujian Agriculture and Forestry University

UKÄ Subject classification

Environmental Sciences

Publication Identifiers

DOI: https://doi.org/10.1016/j.ecoenv.2021.112359

URI (permanent link to this page)

https://res.slu.se/id/publ/112211