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Start Over Author "Chuifan Zhou" Journal ecotoxicology and environmental safety
2 results on '"Chuifan Zhou"'

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

Author

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

Subjects
Antioxidants, Cadmium stress, Dissolved organic matter, FT-ICR MS, Proline, Environmental pollution, TD172-193.5, Environmental sciences, GE1-350
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 μmol 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.

Published
2021
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2. Bioaccumulation and detoxification mechanisms for lead uptake identified in Rhus chinensis Mill. seedlings

Author

Jiaoda Yu, Meiying Huang, Jiamei Wu, Huijun Ren, Xiangqing Ma, and Chuifan Zhou

Subjects
China, Health, Toxicology and Mutagenesis, Rhus, 0211 other engineering and technologies, 02 engineering and technology, 010501 environmental sciences, Photosynthesis, 01 natural sciences, Plant Roots, Cell wall, Soil, Cell Wall, Malondialdehyde, Botany, Phytochelatins, Soil Pollutants, Cellular compartment, 0105 earth and related environmental sciences, 021110 strategic, defence & security studies, Rhus chinensis, biology, Plant Stems, Public Health, Environmental and Occupational Health, General Medicine, biology.organism_classification, Pollution, Plant Leaves, Biodegradation, Environmental, Lead, Catalase, Seedlings, Bioaccumulation, Inactivation, Metabolic, biology.protein, Phytochelatin, Peroxidase
Abstract

A greenhouse experiment was conducted to assay the bioaccumulation and tolerance characteristics of Rhus chinensis Mill. to lead (Pb). The effects of exposing R. chinensis Mill seedlings to increasing Pb concentrations (0, 250, 500, 100mgkg-1) in the soil were assessed by measuring Pb accumulation, subcellular distribution, ultrastructure, photosynthetic characteristics, antioxidative enzyme activity, malondialdehyde content, and phytochelatin content. The majority of Pb taken up by R. chinensis Mill was associated with the cell wall fraction in the roots, where the absorption of Ca increased to maintain cell wall stability, and Pb deposits were found in the intercellular space or in the cell wall structures. In leaves, Pb was primarily stored in the cell wall, while it was compartmentalized into the vacuolar structures in the stem. Pb concentrations adversely affected the morphology of Rhus chinensis Mill cellular substructures. Furthermore, increased Peroxidase (POD) and catalase (CAT) activity was observed in plants grown in Pb-amended soil, and this may have led to reduced ROS to maintain the function of the membrane. Changes in phytochelatin levels (PCs) that were observed in Pb treated plants suggest that PCs formed complexes with Pb in the cytoplasm to reduce Pb2+ toxicity in the metabolically active cellular compartment. This mechanism may allow for the plant to accumulate higher concentrations of toxic Pb and survive for a longer period of time. Our study provides a better understanding of how Rhus chinensis Mill detoxifies Pb.

Published
2016

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