Effects of different exogenous cadmium compounds on the chemical composition and adsorption properties of two gram-negative bacterial EPS

Lian, Zeyang; Yang, Zhen; Song, Weifeng; Sun, Mengge; Gan, Yu; Bai, Xiaoyong

doi:10.1016/j.scitotenv.2021.150511

Cited by 40 publications

(4 citation statements)

References 53 publications

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“…K32 showed Cd-induced exopolysaccharide secretion for metal chelation onto cells [77]. Likewise, under the optimal cadmium stress conditions, Pseudomonas aeruginosa EPS, especially the proteins, had the most significant increase, which was more than 40% compared with the non-stress treatment [80].…”

Section: Discussionmentioning

confidence: 93%

Bioremediation Potential of Native Bacillus sp. Strains as a Sustainable Strategy for Cadmium Accumulation of Theobroma cacao in Amazonas Region

et al. 2022

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Cacao plant cadmium accumulation has become a major concern, especially for small Amazonian producers. A sustainable alternative to address its toxicity is the use of cadmium removal bacteria. In this regard, 138 rhizosphere isolates from cacao were examined. Supported by their phenotypic characterization and in vitro cadmium tolerance, three hypertolerant bacteria were selected and identified as members of the Bacillus (S1C2, R1C2) and Pseudomonas (V3C3) genera. They were able to grow normally and reduce the cadmium content under in vitro conditions. However, only S1C2 and R1C2 evidenced to employ intracellular Cd2+ accumulation, suggesting the variability of bacterial detoxification mechanisms. Their bioremediation capacity for Theobroma cacao CCN51 was also analyzed. Surprisingly, we found high detectable levels of Cd2+ in the non-cadmium supplemented control, suggesting an extra source of cadmium in the pot. Moreover, despite their cadmium reduction performance under in vitro conditions, they exerted highly variable outcomes on stem cadmium accumulation. While S1C2 and R1C2 showed a considerable reduction of Cd content in cacao stems, the strain V3C3 did not show any effect on Cd content. This highlights the complexity of the plant–bacteria interactions and the importance of the in vivo test for the selection of promising PGPR bacteria. Overall, our results suggest the cadmium alleviation potential and promising prospects of native Bacillus strains associated with Amazonian cacao.

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Section: Discussionmentioning

confidence: 93%

Bioremediation Potential of Native Bacillus sp. Strains as a Sustainable Strategy for Cadmium Accumulation of Theobroma cacao in Amazonas Region

et al. 2022

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“…However, when the concentration of NaCl is too high, the activity of the bacteria gradually decreases, 32 leading to a decrease in EPS synthesis, which in turn results in a decrease in the number of binding sites for Na + adsorption. Lian et al 33 reported that when the cadmium compound concentration was increased from 0 to 50 mg•L −1 , the adsorption capacity of EPS gradually increased. However, the adsorption capacity of EPS did not increase when the EPS concentration increased above 50 mg• L −1 .…”

Section: Adsorption Of Sodium Ions By Eps From P Simiae Mhr6 Under Di...mentioning

confidence: 99%

Adsorption of Sodium Ions by Exopolysaccharides from Pseudomonas simiae MHR6 and Its Improvement of Na⁺/K⁺ Homeostasis in Maize under Salt Stress

Liu,

Yao,

Chai

et al. 2023

J. Agric. Food Chem.

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“…Burkholderia cepacia (belonging to the genus Pseudomonas) isolated from TMs-contaminated soil can produce EPS and bind nonspecifically to cations. This results in the adsorption of extracellular Cd by EPS, and thus the ability of EPS to chelate metal ions reduces the bioavailability of Cd [ 142 , 143 ]. In addition to this, it has been reported that under the stimulation of Zn 2+ ions, Rhizobium produces EPS and other biofilms, which enhances the cellular hydrophobicity [ 144 ].…”

Section: Detoxification Regulation Strategies Of Rhizobium Symbiosis ...mentioning

confidence: 99%

Signaling and Detoxification Strategies in Plant-Microbes Symbiosis under Heavy Metal Stress: A Mechanistic Understanding

Liu

et al. 2022

Microorganisms

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Plants typically interact with a variety of microorganisms, including bacteria, mycorrhizal fungi, and other organisms, in their above- and below-ground parts. In the biosphere, the interactions of plants with diverse microbes enable them to acquire a wide range of symbiotic advantages, resulting in enhanced plant growth and development and stress tolerance to toxic metals (TMs). Recent studies have shown that certain microorganisms can reduce the accumulation of TMs in plants through various mechanisms and can reduce the bioavailability of TMs in soil. However, relevant progress is lacking in summarization. This review mechanistically summarizes the common mediating pathways, detoxification strategies, and homeostatic mechanisms based on the research progress of the joint prevention and control of TMs by arbuscular mycorrhizal fungi (AMF)-plant and Rhizobium-plant interactions. Given the importance of tripartite mutualism in the plant-microbe system, it is necessary to further explore key signaling molecules to understand the role of plant-microbe mutualism in improving plant tolerance under heavy metal stress in the contaminated soil environments. It is hoped that our findings will be useful in studying plant stress tolerance under a broad range of environmental conditions and will help in developing new technologies for ensuring crop health and performance in future.

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Effects of different exogenous cadmium compounds on the chemical composition and adsorption properties of two gram-negative bacterial EPS

Cited by 40 publications

References 53 publications

Bioremediation Potential of Native Bacillus sp. Strains as a Sustainable Strategy for Cadmium Accumulation of Theobroma cacao in Amazonas Region

Bioremediation Potential of Native Bacillus sp. Strains as a Sustainable Strategy for Cadmium Accumulation of Theobroma cacao in Amazonas Region

Adsorption of Sodium Ions by Exopolysaccharides from Pseudomonas simiae MHR6 and Its Improvement of Na⁺/K⁺ Homeostasis in Maize under Salt Stress

Signaling and Detoxification Strategies in Plant-Microbes Symbiosis under Heavy Metal Stress: A Mechanistic Understanding

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Effects of different exogenous cadmium compounds on the chemical composition and adsorption properties of two gram-negative bacterial EPS

Cited by 40 publications

References 53 publications

Bioremediation Potential of Native Bacillus sp. Strains as a Sustainable Strategy for Cadmium Accumulation of Theobroma cacao in Amazonas Region

Bioremediation Potential of Native Bacillus sp. Strains as a Sustainable Strategy for Cadmium Accumulation of Theobroma cacao in Amazonas Region

Adsorption of Sodium Ions by Exopolysaccharides from Pseudomonas simiae MHR6 and Its Improvement of Na+/K+ Homeostasis in Maize under Salt Stress

Signaling and Detoxification Strategies in Plant-Microbes Symbiosis under Heavy Metal Stress: A Mechanistic Understanding

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Adsorption of Sodium Ions by Exopolysaccharides from Pseudomonas simiae MHR6 and Its Improvement of Na⁺/K⁺ Homeostasis in Maize under Salt Stress