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. 2023 Mar 14;86(3):1455–1486. doi: 10.1007/s00248-023-02190-1

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Fig. 2 — Categorization of endophytic bacteria based on their lifestyle. Opportunistic endophytes: they are bacteria which occasionally enter plants for their own needs. Passenger endophytes: they are bacteria which enter the plant by chance. Obligate endophytes: they are bacteria which are strictly bound to life inside a plant. Facultative endophytes: they are bacteria which can live inside plants and in other habitats also