NDLI: Cropping practices modulate the impact of glyphosate on arbuscular mycorrhizal fungi and rhizosphere bacteria in agroecosystems of the semiarid prairie.

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Cropping practices modulate the impact of glyphosate on arbuscular mycorrhizal fungi and rhizosphere bacteria in agroecosystems of the semiarid prairie.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sheng, Min Hamel, Chantal Fernandez, Myriam R.
Spatial Coverage	Canada
Description	Author Affiliation: Sheng M ( Northwest A&F University, Yangling, Shaanxi, 712100, People's Rebublic of China.)
Abstract	A growing body of evidence obtained from studies performed under controlled conditions suggests that glyphosate use can modify microbial community assemblages. However, few studies have examined the influence of glyphosate in agroecosystems. We examined 4 wheat-based production systems typical of the Canadian prairie over 2 years to answer the following question: Does preseeding of glyphosate impact soil rhizosphere microorganisms? If so, do cropping practices influence this impact? Glyphosate caused a shift in the species dominating the arbuscular mycorrhizal fungal community in the rhizosphere, possibly through the modification of host plant physiology. Glyphosate stimulated rhizobacterial growth while having no influence on saprotrophic fungi, suggesting a greater abundance of glyphosate-tolerant 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) in bacteria than in fungi. Glyphosate stimulated rhizosphere bacteria in pea but not in urea-fertilized durum wheat, which is consistent with inhibition of EPSPS tolerance to residual glyphosate through high ammonium levels. Mitigation of the effects of glyphosate on rhizosphere bacteria through tillage suggests a reduction in residual glyphosate activity through increased adsorption to soil binding sites upon soil mixing. The influence of glyphosate on Gram-negative bacteria was mitigated under drought conditions in 2007. Our experiment suggests that interactions between soil fertility, tillage, and cropping practices shape the influence of glyphosate use on rhizosphere microorganisms.
File Format	HTM / HTML
ISSN	00084166
e-ISSN	14803275
Journal	Canadian Journal of Microbiology
Issue Number	8
Volume Number	58
Language	English
Publisher	Canadian Science Publishing
Publisher Date	2012-08-01
Publisher Place	Canada
Access Restriction	Open
Subject Keyword	Discipline Microbiology Agriculture Bacteria Drug Effects Ecosystem Glycine Analogs & Derivatives Mycorrhizae Rhizosphere Soil Microbiology 3-phosphoshikimate 1-carboxyvinyltransferase Metabolism Growth & Development Canada Fungi Pharmacology Peas Microbiology Triticum Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Molecular Biology Immunology Microbiology Applied Microbiology and Biotechnology

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Cropping practices modulate the impact of glyphosate on arbuscular mycorrhizal fungi and rhizosphere bacteria in agroecosystems of the semiarid prairie.

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