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Lactobacillus kunkeei impacts the health of honey bees, Apis mellifera scutellata, and protects the bees against the opportunistic pathogen Serratia marcescens

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Abstract

The honey bee, Apis mellifera, is the most critical managed agricultural pollinator and its recent colony losses is of global concern. Bacterial pathogens are one of the causes attributed to the decline of the bee population. Serratia marcescens is an opportunistic pathogen with a broad host range, capable of affecting various plants and animals. S. marcescens can invade various tissues of the honey bee, including the gut and hemolymph, leading to severe infections and compromising bee health. S. marcescens is often associated with secondary infections, and can rapidly multiply forming biofilms, making it particularly challenging to control and eliminate. Understanding the interactions between S. marcescens and the honey bee, as well as exploring potential solutions such as probiotics, is crucial for bee health improvement. In this study, we assessed the effect of Lactobacillus kunkeei, a bee gut associated bacterium on honey bee survival, protection against the opportunistic pathogen S. marcescens, and activation of bee immune responses. Newly emerged worker bees were divided into groups: MD- no treatment, GH-inoculated with hive bees’ gut homogenate and Lk- inoculated with L. kunkeei. After five days of inoculation, bees in each respective group were exposed to the opportunistic pathogen S. marcescens. Our results show that L. kunkeei increased bee survival after S. marcescens infection, inhibited its proliferation in the gut, and reduced antimicrobial peptide genes expression in the gut epithelium compared to microbe-deprived bees in a laboratory setting. Our findings highlight the potential use of the probiotic to enhance bee health.

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Acknowledgements

We are also grateful to Yosef Hamba and Marlin Udo for their support in the experimental setup in the laboratory and our field experts James Ng’ang’a and Joseph Kilonzo.

Funding

This research was funded by the Newton-Utafiti grant from the British Council (grant 275898413), the Swiss National Science Foundation Postdoc Mobility (grants P300PA_174329 and P2ELP3_165168) and icipe core funding provided by UK Aid from the UK Government, Swedish International Development Cooperation Agency (Sida), Swiss Agency for Development and Cooperation (SDC), Federal Democratic Republic of Ethiopia, and the Government of Kenya. The views expressed herein do not necessarily reflect the official opinion of the donors.

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Conceptualization, J.C.P.; investigation, M.C.; data curation, formal analysis, funding acquisition, methodology, visualization, and writing—original draft preparation M.C. and J.C.P., writing—review and editing M.C., J.K. and J.C.P., and project administration: J.C.P.; All authors have read and agreed to the published version of the manuscript.

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Correspondence to Mary Chege.

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The authors declare that they have no conflict of interest.

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Chege, M., Kinyua, J. & Paredes, J.C. Lactobacillus kunkeei impacts the health of honey bees, Apis mellifera scutellata, and protects the bees against the opportunistic pathogen Serratia marcescens. Int J Trop Insect Sci 43, 1947–1955 (2023). https://doi.org/10.1007/s42690-023-01103-6

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  • DOI: https://doi.org/10.1007/s42690-023-01103-6

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