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Microorganisms play a crucial role in plant growth and development. NitrogenFixing Bacteria (NFB), for instance, are essential to plant nitrogen nutrition. However, few studies have been evaluated this important bacterial community in coffee agrosystems. Therefore, this study aims to evaluate the diversity of NFB in soil and fruits sampled from eight coffee farms. After DNA extraction, the V4 hypervariable region of 16S rDNA was amplified and sequenced in Illumina MiSeq sequencer. The prediction of potential nitrogenfixing bacteria was performed by PICRUSt2. One hundred and eighteen ASVs were predicted as potential nitrogen-fixing. Among them, only four were found in fruits. The most abundant phylum was Proteobacteria (71 %), followed by Firmicutes (23 %). The relative abundance of the NFB concerning the whole bacterial community ranged from three to almost six percent. Only one ASV of the Rhizobiaceae family was found simultaneously in fruits and soil. The Bradyrhizobium genus was found in all soil samples. We conclude that important NFB are part of the microbiota present in the soil and coffee fruit and that there is a sharing ASV between them. There also is evidences that Bradyrhizobium genus can be considered a crucial component of the core microbiota in coffee soil.

DIVERSITY OF NITROGEN-FIXING BACTERIA IN COFFEE CROPS (Coffea arabica L.)