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Probiotic properties of an indigenousPediococcus pentosaceus strain onTenebrio molitor larval growth and survival

in Journal of Insects as Food and Feed
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A. Lecocq Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark.

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M.E. Natsopoulou Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark.

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I.E. Berggreen Danish Technological Institute, Life Sciences, Kongsvang Allé 29, 8000 Aarhus, Denmark.

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J. Eilenberg Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark.

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L.-H. Lau Heckmann Danish Technological Institute, Life Sciences, Kongsvang Allé 29, 8000 Aarhus, Denmark.

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H.V. Nielsen Department of Bacteria, Parasites & Fungi, Statens Serum Institut, Artillerivej 5, 2300 Copenhagen, Denmark.

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C.R. Stensvold Department of Bacteria, Parasites & Fungi, Statens Serum Institut, Artillerivej 5, 2300 Copenhagen, Denmark.

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A.B. Jensen Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark.

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Optimising the production of insects for food and feed and ensuring their health are growing concerns for producers. Insects suffer from a range of insect pathogenic microorganisms, and the management of such diseases is essential. One solution is the introduction of beneficial probiotic bacteria into the diet of the insects. Here, we show that a lactic acid bacterial strain,Pediococcus pentosaceus, isolated from the gut of the mealworm,Tenebrio molitor, was able to inhibit the growth of selected insect pathogensin vitro. Usingin vivo assessments of the host’s fitness benefits conferred by the lactic bacterium we show a significant effect ofP. pentosaceus on larval growth rate and survival into adulthood. Gut microbiota analysis focusing on bacterial composition based on 16S rRNA gene amplicon sequencing suggests thatP. pentosaceus could have successfully colonised the guts, or altered their bacteria, of the larvae that received it. Finally, we discuss our results in the context of mass insect production systems and outline the remaining work needed to explore and secure the role of beneficial bacterial additives in the field.

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