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Do Botanical Pesticides Alter the Structure of the Soil Microbial Community?

  • Environmental Microbiology
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Abstract

The effects of synthetic pesticides on the soil microbial community have been thoroughly investigated in the past mostly by culture-dependent methods and only few recent studies have used culture-independent approaches for this purpose. However, it should be noted that most of these studies have been conducted in microcosms where the soil microbial community is exposed to unrealistic concentrations of the pesticides, providing an unrealistic exposure scheme for soil microorganism. On the other hand, little is known regarding the potential impact of botanical pesticides on the soil microbial community. Therefore, a laboratory study and a field study were conducted to investigate the effects of synthetic (metham sodium [MS], sodium tetrathiocarbonate [SoTe], and fosthiazate) and botanical pesticides (azadirachtin, quillaja, and pulverized Melia azedarach fruits [PMF]) on the soil microbial community using phospholipid fatty acids (PLFA) analysis. Principal component analysis (PCA) on the results of the laboratory study indicated that the application of PMF resulted in significant changes in the soil microbial community. This was obvious by the proportional increase in the abundance of fatty acids 18:1ω9cis, 18:1ω9trans, which are common in gram-negative bacteria and saprotrophic fungi, and 18:2ω6,9, which is a fungal indicator. This response was attributed to the release of copious amounts of organic carbon and nutrients in the soil by the PMF. On the other hand, MS inhibited fungi and gram-negative bacteria, while fosthiazate and the botanical pesticides quillaja and azadirachtin did not impose significant changes in the soil microbial community. Similar results were obtained by the field study where application of the fumigants MS and SoTe significantly altered the structure of the soil microbial community with the former having a more prominent effect. Fosthiazate imposed mild changes in the soil microbial community, whereas quillaja and azadirachtin again did not show a significant effect. Overall, botanical pesticides, at their recommended dose, did not alter the structure of the soil microbial community compared to synthetic nonfumigant and fumigant pesticides which induced significant changes.

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Authors and Affiliations

  1. Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos and Aiolou Street, Larisa, 41221, Greece

    Dimitrios G. Karpouzas

  2. School of Agriculture, Laboratory of Pesticide Science, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece

    Ioanna M. Spyrou & Urania Menkissoglu-Spiroudi

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  1. Ioanna M. Spyrou
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  2. Dimitrios G. Karpouzas
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  3. Urania Menkissoglu-Spiroudi
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Correspondence to Dimitrios G. Karpouzas.

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Spyrou, I.M., Karpouzas, D.G. & Menkissoglu-Spiroudi, U. Do Botanical Pesticides Alter the Structure of the Soil Microbial Community?. Microb Ecol 58, 715–727 (2009). https://doi.org/10.1007/s00248-009-9522-z

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