Glyphosate Biodegradation by Airborne Plant Growth-Promoting Bacteria: Influence on Soil Microbiome Dynamics

Beatriz Genoveva Guardado-Fierros, Miguel Angel Lorenzo-Santiago, Thiago Gumiere (), Lydia Aid, Jacobo Rodriguez-Campos () and Silvia Maribel Contreras-Ramos ()
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Beatriz Genoveva Guardado-Fierros: Unidad de Tecnología Ambiental, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco A.C. (CIATEJ), Normalistas No. 800, Colinas de la Normal, Guadalajara 44270, JA, Mexico
Miguel Angel Lorenzo-Santiago: Unidad de Tecnología Ambiental, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco A.C. (CIATEJ), Normalistas No. 800, Colinas de la Normal, Guadalajara 44270, JA, Mexico
Thiago Gumiere: Department of Soil and Agricultural Engineering, Laval University, Quebec City, QC G1V 0A6, Canada
Lydia Aid: Department of Soil and Agricultural Engineering, Laval University, Quebec City, QC G1V 0A6, Canada
Jacobo Rodriguez-Campos: Unidad de Servicios Analíticos y Metrológicos, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco A.C. (CIATEJ), Guadalajara 44270, JA, Mexico
Silvia Maribel Contreras-Ramos: Unidad de Tecnología Ambiental, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco A.C. (CIATEJ), Normalistas No. 800, Colinas de la Normal, Guadalajara 44270, JA, Mexico

Agriculture, 2025, vol. 15, issue 4, 1-28

Abstract: Due to its persistence, glyphosate contamination in soil poses environmental and health risks. Plant growth-promoting bacteria (PGPB) offer a potential solution for mitigating glyphosate pollution. This study assessed the glyphosate degradation capacity of three airborne PGPB isolates ( Exiguobacterium indicum AS03, Kocuria sediminis AS04, and Rhodococcus rhodochrous AS33) individually and in a consortium (CS) compared to natural attenuation in microcosms as the control (CTL), where soil autochthonous microorganisms (MS) were present. AS03 exhibited the highest glyphosate degradation (86.3%), followed by AS04 and AS33 at 14 days (61.6% and 64.7%). The consortium accelerated glyphosate removal, reaching 99.7%, while the control treatment removal was 94% at 60 days. Aminomethylphosphonic acid (AMPA) is the main metabolite in glyphosate degradation, and it had a maximum peak in concentration at 28 days in the CS + MS (1072 mg kg −1 ) and CTL (990 mg kg −1 ) treatments. Subsequently, a decrease in AMPA concentration was observed at 60 days up to 349 mg kg −1 and 390 mg kg −1 , respectively. These results suggested that soil autochthonous microorganisms and their interactions with a consortium have similar biotransformation of glyphosate, but the AMPA conversion to other intermedium metabolites through degradation was slow. A minimum AMPA concentration of 15–45 mg kg −1 over time was detected with the consortium. The microbiome analysis revealed shifts in microbial composition, with an increase in glyphosate-degrading genera like Psychrobacter and Lyzobacter . These changes enhance soil resilience and fertility, demonstrating the potential of airborne PGPB for bioremediation and environmental sustainability.

Keywords: AMPA; glyphosate; Kocuria sediminis; Rhodococcus rhodochrous; airborne bacteria (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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