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14 páginas, 6 figuras, Ips typographus (European spruce bark beetle) is the most destructive pest of spruce forests in Europe. As for other animals, it has been proposed that the microbiome plays important roles in the biology of bark beetles. About the bacteriome, there still are many uncertainties regarding the taxonomical composition, insect-bacteriome interactions, and their potential roles in the beetle ecology. Here, we aim to deep into the ecological functions and taxonomical composition of I. typographus associated bacteria., This research was cofounded by Czech Science Foundation (GAČR), grant number GAČR-Senior 19-09072 S and the Regional Government of Castile and Leon (Escalera de Excelencia CLU-2018-04), co-funded by the Operational Program of the European Regional Development Fund for Castile and Leon 2014–2020. E.P.-A. received a grant co-financed by the Regional Government of Castille and Leon and the FEDER funds. Z.S-S also received a grant co-financed by the European NextGenerationEU, Spanish “Plan de Recuperación, Transformación y Resiliencia”, Spanish Ministry of Universities, and University of Salamanca (“Ayudas para la recualificación del sistema universitario español 2021–2022”)

14 páginas, 1 figura, 1 tabla Symbiosis between microbes and insects has been raised as a promising area for understanding biological implications of microbe–host interactions. Among them, the association between fungi and bark beetles has been generally recognized as essential for the bark beetle ecology. However, many works investigating bark beetle bacterial communities and their functions usually meet in a common finding: Pseudomonas is a broadly represented genus within this holobiont and it may provide beneficial roles to its host. Thus, we aimed to review available research on this microbe–host interaction and point out the probable relevance of Pseudomonas strains for these insects, in order to guide future research toward a deeper analysis of the importance of these bacteria for the beetle’s life cycle This research was funded by the Czech Science Foundation (GACR), grant number GACR Senior 19-09072S. The researchers also thank the Excellence Unit of the Spanish-Portuguese Institute for Agricultural Research (CIALE) (CLU-2018-04) for the provision of research facilities. ZSS received a grant from the Junta de Castilla y León, Spanish Regional Government