Effect of Glyphosate on Microbiota and Enzymatic Activity in Rhizosphere of Riparian Plants
Glyphosate is a foliar herbicide detected in soil, sediment, and water, causing non-visible damage to non-target organisms, potentially affecting the diversity, structure, and functioning of microbial communities associated with riparian vegetation that provide ecosystem services. The objective of the present work was 1) to determine the viable counts of microorganisms and 2) to analyze how the enzymatic activities associated with the metabolism of carbon, phosphorus, and nitrogen are affected in the riparian plants’ rhizosphere (Fimbristylis dichotoma, Ludwigia octovalvis, and Typha domingensis) exposed to glyphosate. The plants were collected with the same soil in which they lived to maintain the micro-habitat of the rhizosphere. Zero or fifty mg of glyphosate acid equivalent (ae)/L was applied to the plants at the ground level for 15 days. Actinomycetes, total bacteria (including actinomycetes), and fungi were then isolated and quantified, and the activity of 19 enzymes (metabolism of P, C, and N) were analyzed from rhizosphere samples. In the presence of the herbicide, it was found that 1) bacteria was most negatively affected compared to actinomycetes and fungi, and 2) microbial populations isolated from L. octovalvis were lesser than those from T. domingensis and F. dichotoma. Rhizosphere enzymatic activities showed that phosphorus and carbon metabolism were stimulated by glyphosate. The information obtained from this work allows us to identify the response of cultivable microbial diversity and functional diversity of the rhizosphere of ecologically important plants.
| Main Authors: | , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Departamento de Biología
2024
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| Online Access: | https://revistas.unal.edu.co/index.php/actabiol/article/view/108336 |
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