The traits of the plant growth promoting acetic acid bacterium, nguyenibacter vanlangensis

Abstract

To prove the role of acetic acid bacteria as an additional plant growth promoter, the two strains of Nguyenibacter vanlangensis (TN01LGIT and VTH-AC01), the family Acetobacteraceae, were examined for nitrogen fixing ability, phosphorus and zinc solubilizing capability, phytohormon auxin production, and inducing activity of an expression of encoding the pathogenic-related protein gene. The two strains were nitrogen fixers due to the observation of acetylene reduction, solubilized phosphorus and zinc in the presence of Ca3(PO4)2 or ZnO (1 %, w/v, respectively), and produced phytohormon auxin, i.e. indole acetic acid (IAA) in the presence of L-tryptophan. The indirect effect to the plant growth was also recognized, since the two strains induced an expression of pr-1 gene, an encoding pathogenic-related protein gene of Arabidopsis thaliana PR1::GUS. The two strains were plant growth promoters by direct and indirect mechanisms. The species is therefore an additional plant-growth promoting acetic acid bacterium.