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https://doi.org/10.5194/soil-2020-11
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/soil-2020-11
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: original research article 31 Mar 2020

Submitted as: original research article | 31 Mar 2020

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A revised version of this preprint is currently under review for the journal SOIL.

Acute glyphosate exposure does not condition the response of microbial communities to a dry–rewetting disturbance in a soil with longhistory of glyphosate–based herbicides

Marco Allegrini1, Elena del Valle Gomez1, and María Celina Zabaloy2 Marco Allegrini et al.
  • 1Laboratorio de Biodiversidad Vegetal y Microbiana, IICAR–CONICET–UNR, Zavalla, 2125, Argentina
  • 2Centro de Recursos Naturales Renovables de la Zona Semiárida (CERZOS–CONICET), Departamento de Agronomía, Universidad Nacional del Sur, Bahía Blanca, 8000, Argentina

Abstract. Dry–rewetting perturbations are natural disturbances in the edaphic environment and particularly in dryland cultivation areas. The interaction of this disturbance with glyphosate–based herbicides (GBHs) deserves special attention in the soil environment due to the intensification of agricultural practices and the acceleration of climate change with an intensified water cycle. The objective of this study was to assess the response of microbial communities in a soil with long history of GBHs to a secondary imposed perturbation (a single dry–rewetting event). A factorial microcosm study was conducted to evaluate the potential conditioning effect of an acute glyphosate exposure on the response to a following dry–rewetting event. A Respiratory Quotient (RQ) based on an ecologically relevant substrate (p–coumaric acid) and basal respiration was used as physiological indicator. Similarly, DNA–based analyses were considered, including quantitative PCR (qPCR) of functional sensitive microbial groups linked to cycles of carbon (Actinobacteria) and nitrogen (ammonia–oxidizing microorganisms), qPCR of total bacteria and denaturing gradient gel electrophoresis (DGGE) of ammonia–oxidizing bacteria (AOB). Significant effects of Herbicide and of Dry–rewetting perturbations were observed in the RQ and in the copy number of amoA gene of AOB, respectively. However, no significant interaction was observed between them when analyzing the physiological indicator and the copy number of the evaluated genes. PCR–DGGE results were not conclusive regarding a potential effect of Dry–rewetting × Herbicide interaction on AOB community structure, suggesting further analysis by deep sequencing of amoA gene.

Marco Allegrini et al.

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Marco Allegrini et al.

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Short summary
A research was conducted to assess the response of microbial communities in a soil with long history of glyphosate-based herbicides to a secondary imposed perturbation (dry-rewetting event). Both perturbations could increase their frequency under current agricultural practices and climate change. The results of this study demonstrates that acute exposure to a glyphosate-based herbicide does not have a conditioning effect on the response of microbial communities to the dry-rewetting event.
A research was conducted to assess the response of microbial communities in a soil with long...
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