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Phosphate-solubilizing and phytate-mineralizing bacteria collectively termed as phosphobacteria provide a sustainable approach for managing P-deficiency in agricultural soils by supplying inexpensive phosphate to plants. A phosphobacterium  Bacillus subtilis  strain KPS-11 (Genbank accession no. KP006655) was isolated from potato ( Solanum tuberosum  L.) rhizosphere and characterized for potato plant growth promoting potential. The strain utilized both Ca-phosphate and Na-phytate  in vitro  and produced 6.48 μg mL -1  indole-3-acetic acid in tryptophan supplemented medium. P-solubilization after 240 h was 66.4 μg mL -1  alongwith the production of 19.3 μg mL -1  gluconic acid and 5.3 μg mL -1  malic acid. The extracellular phytase activity was higher (4.3 × 10 -10  kat mg -1  protein) than the cell-associated phytase activity (1.6 × 10 -10  kat mg -1  protein).  B. subtilis  strain KPS-11 utilized 40 carbon sources and showed resistance against 20 chemicals in GENIII micro-plate system demonstrating its metabolic potential. Phytase-encoding gene β-propeller (BPP) showed 92% amino acid similarity to BPP from  B. subtilis  (accession no.WP_014114128.1) and 83% structural similarity to BPP from  B. subtilis  (accession no 3AMR_A). Potato inoculation with  B. subtilis  strain KPS-11 increased the root/shoot length and root/shoot weight of potato as compared to non-inoculated control plants. Moreover, rifampicin-resistant derivative of KPS-11 were able to survive in the rhizosphere and on the roots of potato up to 60 days showing its colonization potential. The study indicates that  B. subtilis  strain KPS-11 can be a potential candidate for development of potato inoculum in P-deficient soils.

frontiers in microbiology

Isolation and characterization of a Î²-propeller gene containing phosphobacterium Bacillus subtilis strain KPS-11 for growth promotion of potato (Solanum tuberosum L.)