Abstract：Microbial communities have different composition and distribution in different tissues of plants, In this study, ITS high-throughput sequencing was used to compare the differences in the composition and diversity of endophytic fungal communities in leaves, branches and fruits of Eucalyptus torelliana, E. citriodora, E. exserta and E. urophylla × E. grandis G9. The results of microbial community structure analysis of the four Eucalyptus species showed that Ascomycota and Basidiomycota were the dominant phyla in all samples, but the relative abundance varied in different samples. The biodiversity analysis showed that the endophytic fungal communities of E. torelliana and E. citriodora were similar in the same tissue and in different tissues, while E. exserta and G9 had similar endophytic fungal communities in the same tissue and more differences in endophytic fungal communities in different tissues. The diversity indices of the four eucalypts in branches were not significantly different, while the Chao1, Observed species and PD whole tree indices of endophytic fungal communities were significantly higher in the fruits of E. exserta and G9 than in E. torelliana and E. citriodora. LEfSe analysis showed that the differential species in E. citriodora (branches and fruits) and E. exserta (leaves and fruits) were distributed in the Ascomycota, while those in E. torelliana (fruits) and G9 (leaves and branches) were distributed in both Ascomycota and Basidiomycota. Eucalyptus contains abundant endophytic fungal community, which varies greatly depending on species and tissues. G9 leaves and E. exserta fruit parts possess more endophytic fungal communities, these studies provide an important basis for the subsequent development and utilization of endophytic fungal resources in Eucalyptus.
2023, Vol. 36 
