Abstract
Currently, there is little knowledge of the establishment of repeatedly applied biological control agents (BCAs) in the phyllosphere of plants and, in particular, their interactions with the resident microbiome. Under field conditions, the BCA Aureobasidium pullulans was applied as a model organism to organically grown strawberries during two subsequent years (2011, 2012), either as single strain treatment or with the co-application of the entomopathogenic fungus Beauveria bassiana. Fungal and bacterial communities of strawberry leaves were investigated by means of plate counts and 454 pyrosequencing. The establishment of the introduced A. pullulans strains considerably differed between the two years, presumably due to distinct environmental conditions. Short-term and long-term effects of BCA applications on the composition and diversity of fungal communities could be observed as a result of successful establishment of A. pullulans, in 2011, showing, for instance, reduced diversity of fungal communities by competitive displacement shortly after BCA introduction. Due to considerable dynamics in untreated resident microbial communities in the phyllosphere in general, however, we suggest that even the effects caused by the applied BCA preparations in 2011 are negligible under practical conditions.
Highlights
Introduction of Aureobasidium pullulans to thePhyllosphere of Organically Grown Strawberries with Focus on ItsEstablishment and Interactions with the Resident MicrobiomeJustine Sylla 1,2,3*, Beatrix W
Cook et al [17] postulated that biological control agents should not competitively displace the resident microbiome associated with the BCAs’ site of introduction
The results of the present study suggest that the co-application of B. bassiana does not clearly affect the interactions between A. pullulans and the resident strawberry leaf microbiota
Summary
Introduction of Aureobasidium pullulans to thePhyllosphere of Organically Grown Strawberries with Focus on ItsEstablishment and Interactions with the Resident MicrobiomeJustine Sylla 1,2,3*, Beatrix W. Phyllosphere of Organically Grown Strawberries with Focus on Its. Establishment and Interactions with the Resident Microbiome. There is little knowledge of the establishment of repeatedly applied biological control agents (BCAs) in the phyllosphere of plants and, in particular, their interactions with the resident microbiome. The BCA Aureobasidium pullulans was applied as a model organism to organically grown strawberries during two subsequent years (2011, 2012), either as single strain treatment or with the co-application of the entomopathogenic fungus Beauveria bassiana. Various BCAs (e.g., Aureobasidium pullulans and Trichoderma harzianum) have shown good potential to control plant pathogens, such as Botrytis cinerea [3,4,15,16].
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