| Summary: | In this paper, the composition profiles of bacterial endophytes in wild-growing Amur grape <i>Vitis amurensis</i> Rupr. grown in the south of the Russian Far East were analyzed using both a cultivation-dependent (sowing bacteria) and a cultivation-independent (next generation sequencing, NGS) approach. Both methods revealed the prevalent endophytes in <i>V. amurensis</i> were represented by <i>Gammaproteobacteria</i>—40.3–75.8%, <i>Alphaproteobacteria</i>—8.6–18.7%, <i>Actinobacteria</i>—9.2–15.4%, and <i>Bacilli</i>—6.1–6.6%. NGS also showed a large proportion of <i>Bacteroidia</i> (12.2%) and a small proportion of other classes (less than 5.7%). In general, NGS revealed a greater variety of classes and genera in the endophytic bacterial community due to a high number of reads (574,207) in comparison with the number of colonies (933) obtained after the cultivation-dependent method. A comparative analysis performed in this study showed that both wild grape <i>V. amurensis</i> from Russia and domesticated cultivars of <i>V. vinifera</i> from Germany and California (USA) exhibit the same basic composition of endophytic bacteria, while the percentages of major taxa and minor taxa showed some differences depending on the plant organ, grape individuals, environmental conditions, and sampling time. Furthermore, the obtained data revealed that lower temperatures and increased precipitation favored the number and diversity of endophytic bacteria in the wild Amur grape. Thus, this study firstly described and analyzed the biodiversity of endophytic bacteria in wild grapevine <i>V. amurensis</i>.
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