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Contrasting microbial diversity in conducive and putative suppressive soils to garlic white rot

Valdir Lourenço, Jr.: Embrapa

<div>White rot, caused by <em>Stromatinia cepivorum</em>, is a devastating disease on garlic in Brazil. As disease-suppressive soils provide a valuable resource for studying beneficial microbial communities, the objective of this study was to analyze the microbiota diversity from fields with no record of white rot in Minas Gerais state, Brazil. Five samples were collected from putative suppressive soils in the municipalities of Gouveia (GO, 06, and 06B) and Campos Altos (SH1 and SH2). Three samples from conducive soils were collected in the municipalities of Capim Branco (02 and 02B) and Rio Paranaíba (CO). A total of 218 and 291 fungal and bacterial OTUs were detected, respectively. The alpha diversity values of the samples ranged as follows: richness estimate (12-94), Shannon diversity (3.4-80.7), and Simpson diversity (2.3-66.5). Members of the phyla Acidobacteria and Proteobacteria were more abundant in all locations. The highest bacterial diversity was estimated in CO, 02, 06, SH1, and SH2 samples. For fungi, specimens of the Ascomycota and Basidiomycota phyla were more frequent. Interestingly, the highest diversity and number of unclassified fungi were found in the putative suppressive soils GO, SH2, and 06, suggesting that suppressiveness to white rot is related to microbial abundance and variability. Additional studies should be conducted to identify functional biological entities that can contribute to white rot suppression.</div>