“…Currently, many reports employ NGS to reveal fundamental and new understanding of the rhizomicrobiome structure and diversity (Metzker, 2010;Mendes et al, 2013;Knief, 2014;Lopez et al, 2017). Among bacteria and whatever the soil type studied, whether contaminated with metals (Kim et al, 2006) or non-contaminated (Smalla et al, 2001;Miethling et al, 2003), the phylum Proteobacteria generally represents the dominant members of the rhizosphere microbiome (Uroz et al, 2010;Johnston-Monje et al, 2016;Yang et al, 2017) followed by other phyla such as Actinobacteria, Acidobacteria, Bacteroidetes, Firmicutes, Verrucomicrobia and Planctomycetes (Buée et al, 2009b;Turner et al, 2013;Prashar et al, 2014;Yang et al, 2017). In the ultramafic soils of Halmahera, the microbial community composition consisted of high proportions of Proteobacteria and Acidobacteria phyla that are abundant in many other soil types (Janssen, 2006;Lauber et al, 2009;Yang et al, 2017).…”