WASHING OF HEAVY METAL-CONTAMINATED SOILS USING PYOVERDINE EXTRACTED FROM PLANT GROWTH-PROMOTING BACTERIA PSEUDOMONAS LACTIS AND P. ATACAMENSIS
Abstract
DOI: 10.26471/cjees/2024/019/288
Soil contamination by metallic trace elements (MTEs) poses a significant environmental challenge, with far-reaching implications for human health and biodiversity. In this context, the exploration of biological methods for chelating MTEs has emerged as a promising, environmentally sustainable approach. Notably, certain metallophores, particularly pyoverdine, demonstrate effective scavenging properties, offering a viable solution. This study involved screening forty-five Pseudomonas isolates for their potential to extract these metals from contaminated soils. Additionally, we monitored the synthesis of various metabolites, including siderophores, indole-3-acetic acid (IAA), ammonia, hydrogen cyanide (HCN), and phosphate solubilization. The purified siderophore fraction was characterized using Fourier Transform Infrared Spectroscopy (FT-IR). Results indicated a notably higher level of siderophore production in P. lactis, P. atacamensis, and Pseudomonas sp. PS11. Particularly, the pyoverdine from P. lactis demonstrated a higher binding affinity for bromine, tin, rhodium, and lead. Our findings conclude that pyoverdine extracted from P. atacamensis exhibited an enhanced capacity for copper ion removal (49.63%), surpassing that of P. lactis (47.65%) and the control agents (EDTA and citric acid, ranging from 43.11% to 27.58%).
- Soil
- contamination
- metallic
- trace
- elements
- pyoverdine
- remove
- PGPR
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© 2024 by the author(s). Licensee CJEES, Carpathian Association of Environment and Earth Sciences. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
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