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While phosphorus (P) soil content varies widely only a small proportion of P is available to plants (Banach et al., 2015). Water insoluble inorganic P forms are found as P bearing constituent soil minerals like apatite and strengite (Brogowski and Kwasowski, 2009; Belgaroui et al., 2016). Unavailable organic P is contained in various organic substances such as inositol phosphate, esters, phospholipids, nucleic acids and some derivatives of phosphonic acid (Abbasi et al., 2015; Banach et al., 2015; Delfim et al., 2018). In some soil types, significant P amounts remain unavailable due to the chemical fixation and organic colloids sorption. About 50% of adsorbed P is organic matter bound (Brogowski and Kwasowski, 2009; Banach et al., 2015; Belgaroui et al., 2016). Soil microbes has been widely known to be capable of P solubilizing, including the following bacterial genera Pseudomonas, Bacillus and Escherichia, the fungal genera Aspergillus, Penicillium and Culvularia and the Actinomicetes genus Streptomyces (Gao et al., 2016; Rathi and Gaur, 2016). Soil bacteria capable of enhancing P soil bioavailability adsorbed through production of organic acids (citric, malic, oxalic, gluconic and acetic acids); chelation of Al, Fe and Ca cations by organic acids containing carboxyl and hydroxyl anions; ligand exchange between organic anions and Al, Fe and Ca-bound phosphate; and colloid adsorbtion sites blocking by organic acids and charged cells surfaces; produce phosphatase and phytase improve P availability through organic P mineralization (Castagno et al., 2011; Azeem et al., 2014; Abbasi et al., 2015; Belgaroui et al., 2016; Stella and Sahren, 2016). Microbe gene expression as a response to the surrounding environment is largely governed by their population density which can be detected by autoinducing substances referred to as quorum sensing (QS) signaling molecules (Palmer et al., 2014; Barriuso, 2015; Mahmoudi, 2015). Generally, gram negative bacteria produce autoinducers N-Acyl Homoserine Lactone (N-AHL) form, the derivatives of which include N-butanoyl (BHL; C4), N-hexanoyl (HHL; C6), N-octanoyl (OHL; C8), N-decanoyl (DHL; C10) and N-dodecanoyl (dDHL; C12) Homoserine Lactones (Rani et al., 2011; Ransome et al., 2013; Zhang et al., 2016). These QS signaling molecules are also produced by plant roots. In the rhizosphere, there are species or microbial populations as a form of mutual interactions between plants and microbes (Badura, 2004; Palmer et al., 2014; Rathi et al., 2016). In soils, microbes can transfer genetic materials not only to the other microbes, but also to the plant as a way of communication between the soil, plant and microbes (Kobus, 1999; Gao et al.,

The biochemical characteristics of phosphate bacteria capable of increasing soil phosphorus bioavailability in Andisols