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Risikofolgeabschätzung für den Einsatz mikrobieller Antagonisten: Gibt es Effekte auf Nichtzielorganismen?

Risk assessment for microbial antagonists: Are there effects on non-target organisms?

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Zusammenfassung

Die biologische Kontrolle phytopathogener Pilze auf der Basis antagonistischer Mikroorganismen stellt eine umweltfreundliche Alternative im Pflanzenschutz dar. Dennoch können unerwünschte Nebeneffekte, z. B. die Wirkung auf Nichtzielorganismen, verbunden mit dem Verlust ökologisch wichtiger Bodenfunktionen, nicht von vornherein ausgeschlossen werden. Ziel dieser Studie war es, die Untersuchung der Auswirkung von Biofungiziden (Biological Control Agents = BCAs) auf mikrobielle Nichtzielorganismen unter kommerziellen Anbaubedingungen zu untersuchen. In Freilandversuchen wurden die bakteriellen BCAs Serratia plymuthica HRO-C48 und Streptomyces sp. HRO-71 zur Kontrolle von Verticillium dahliae an Erdbeere und Kartoffel, die bakteriellen BCAs Pseudomonas trivialis 3Re2-7, P. fluorescens L13-6-12, S. plymuthica 3Re4-18 sowie die pilzlichen Antagonisten Trichoderma reesei G1/8 und T. viride G3/2 zur Unterdrückung von Rhizoctonia solani an Kopfsalat oder Kartoffel appliziert. Eine verallgemeinernde Interpretation der Ergebnisse ist aufgrund der Zugehörigkeit der selektierten BCAs zu verschiedenen Mikroorganismengruppen wie grampositiven (HRO-71) und gramnegativen (HRO-C48, L13-6-12, 3Re2-7, 3Re4-18) Bakterien oder den Ascomyceten (G1/8, G3/2) möglich. Die BCAs besiedeln sowohl die Rhizosphäre als auch die Endorhiza (3Re2-7, 3Re4-18). An keiner Kulturpflanze waren nach Applikation der BCAs langzeitige Veränderungen der pflanzenassoziierten Mikroflora festzustellen. Damit ist keine nachhaltige Gefährdung für die indigenen Mikroorganismenpopulationen gegeben. Die neu gewonnenen Erkenntnisse können zu einer schnelleren Entwicklung und Zulassung von potenziellen mikrobiellen Pflanzenschutzpräparaten beitragen.

Abstract

Biological control of phytopathogenic fungi using antagonistic microorganisms is an environmentally friendly alternative in plant protection. However, possible non-target effects of the applied antagonists on ecologically important soil-microbes need to be considered. Therefore, the aim of this study was to analyse the effect of biological control agents (BCAs) on non-target microbes in the field. Whereas the bacterial BCAs Serratia plymuthica HRO-C48 and Streptomyces sp. HRO-71 were applied to control the pathogen Verticillium dahliae on strawberry and potato, the bacterial strains Pseudomonas trivialis 3Re2-7, P. fluorescens L13-6-12, S. plymuthica 3Re4-18 and the fungal antagonists Trichoderma reesei G1/8 and T. viride G3/2 were introduced to control Rhizoctonia solani on lettuce and potato. As the analysed BCAs belong to different microbial groups like grampositive (HRO-71) and gramnegative (HRO-C48, L13-6-12, 3Re2-7, 3Re4-18) bacteria or the ascomycota (G1/8, G3/2) and originated from different micro-habitats like the rhizosphere or the endorhiza, general conclusion could be drawn from our results. After BCA treatment we did not observe any long-term effect on the plant-associated microbes in any tested pathosystem. Therefore, no sustainable risks could be seen for the indigenous micro-organisms. Our new findings may help to improve the development as well as the registration procedures of future microbial plant protection products.

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Die Arbeiten wurden durch die Bundesanstalt für Landwirtschaft und Ernährung unterstützt.

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Berg, G., Grosch, R. & Scherwinski, K. Risikofolgeabschätzung für den Einsatz mikrobieller Antagonisten: Gibt es Effekte auf Nichtzielorganismen?. Gesunde Pflanzen 59, 107–117 (2007). https://doi.org/10.1007/s10343-007-0155-1

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