Mohy-Ud-Din Waqas, Chen Feng, Bashir Safdar, Akhtar Muhammad Javed, Asghar Hafiz Naeem, Farooqi Zia Ur Rahman, Zulfiqar Usman, Haider Fasih Ullah, Afzal Aneeqa, Alqahtani Mashael Daghash
Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan.
Department of Soil and Environmental Sciences, Ghazi University, Dera Ghazi Khan, Pakistan.
Front Microbiol. 2023 Dec 20;14:1285566. doi: 10.3389/fmicb.2023.1285566. eCollection 2023.
Glyphosate [N-(phosphonomethyl)-glycine] is a non-selective herbicide with a broad spectrum activity that is commonly used to control perennial vegetation in agricultural fields. The widespread utilization of glyphosate in agriculture leads to soil, water, and food crop contamination, resulting in human and environmental health consequences. Therefore, it is imperative to devise techniques for enhancing the degradation of glyphosate in soil. Rhizobacteria play a crucial role in degrading organic contaminants. Limited work has been done on exploring the capabilities of indigenously existing glyphosate-degrading rhizobacteria in Pakistani soils. This research attempts to discover whether native bacteria have the glyphosate-degrading ability for a sustainable solution to glyphosate contamination. Therefore, this study explored the potential of 11 native strains isolated from the soil with repeated glyphosate application history and showed resistance against glyphosate at higher concentrations (200 mg kg). Five out of eleven strains outperformed in glyphosate degradation and plant growth promotion. High-pressure liquid chromatography showed that, on average, these five strains degraded 98% glyphosate. In addition, these strains promote maize seed germination index and shoot and root fresh biomass up to 73 and 91%, respectively. Furthermore, inoculation gave an average increase of acid phosphatase (57.97%), alkaline phosphatase (1.76-fold), and dehydrogenase activity (1.75-fold) in glyphosate-contaminated soil. The findings indicated the importance of using indigenous rhizobacteria to degrade glyphosate. Therefore, by maintaining soil health, indigenous soil biodiversity can work effectively for the bioremediation of contaminated soils and sustainable crop production in a world facing food security.
草甘膦[N-(膦酰基甲基)甘氨酸]是一种具有广谱活性的非选择性除草剂,常用于控制农田中的多年生植被。草甘膦在农业中的广泛使用导致土壤、水和粮食作物受到污染,从而对人类和环境健康造成影响。因此,必须设计出增强草甘膦在土壤中降解的技术。根际细菌在降解有机污染物方面起着关键作用。在探索巴基斯坦土壤中本土存在的草甘膦降解根际细菌的能力方面,所做的工作有限。本研究试图发现本地细菌是否具有草甘膦降解能力,以寻求草甘膦污染的可持续解决方案。因此,本研究探索了从具有反复草甘膦施用历史且对高浓度(200 mg/kg)草甘膦具有抗性的土壤中分离出的11株本地菌株的潜力。11株菌株中有5株在草甘膦降解和促进植物生长方面表现出色。高压液相色谱分析表明,这5株菌株平均降解了98%的草甘膦。此外,这些菌株分别使玉米种子发芽指数以及地上部和根部鲜生物量提高了73%和91%。此外,接种这些菌株使草甘膦污染土壤中的酸性磷酸酶活性平均提高了57.97%,碱性磷酸酶活性提高了1.76倍,脱氢酶活性提高了1.75倍。研究结果表明利用本土根际细菌降解草甘膦的重要性。因此,在一个面临粮食安全问题的世界中,通过维持土壤健康,本土土壤生物多样性能够有效地用于污染土壤的生物修复和可持续作物生产。