Soil bacterial community affected by aggregate size under agro-management in vineyard grounds

Soil micro-organisms are an indispensable component of natural ecosystems, as well play an important role in agro-management modified ecosystems. Although metagenomics is currently used to explore microbial communities, its application has not been as extensive in terrestrial ecosystems. Microbial taxonomic profiles and phylogenetic studies had improved greatly our knowledge on community composition and its diversity however, the functional potential of microbial communities associated with is still a black box espectial in terrestrial systems. Predicting functional profiles through 16S rDNA gene-based metagenomics analysis is perhaps one of the most promising tools to elucidate the metabolic capabilities of soil microbial communities. The aim of the present study was to validate the effect of two agro management practices e.g organic and conventional in a vineyard field on soil bacteria community and its composition in three different soil aggregate size. In addition to comparing community composition, applying functional gene prediction tools for assessment and comparison of community functionality among the two managements and aggregate size. The obtained results show, clear distinction between the two-field management. Twelve phyla and 45 order had been found in the soil samples were the Proteobacteria was the most common phyla in all treatments. The Proteobacteria phyla in the conventional treatments (Ba) reached over 99 % in the near vine plants (B) and 1 and 0,5 mm and Ba open space between the vine plant rows (R), 1 mm aggregate size. Twenty-three functional profiles had been obtained for both treatments and aggregate size showing similarity in their function, suggesting that functionality is due to the community composition and a wide range of environmental conditions. These results elucidate that organic farming system have beneficial effect on microbial diversity that encourage ecosystem multifunctionality.