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.
Isolation and characterization of a β-propeller gene containing phosphobacterium Bacillus subtilis strain KPS-11 for growth promotion of potato (Solanum tuberosum L.)
M. Hanif,S. Hameed,A. Imran,Tahir Naqqash,Muhammad Shahid,J. V. van Elsas
Published 2015 in Frontiers in Microbiology
ABSTRACT
PUBLICATION RECORD
- Publication year
2015
- Venue
Frontiers in Microbiology
- Publication date
2015-06-09
- Fields of study
Agricultural and Food Sciences, Medicine, Biology, Environmental Science
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- bacillus subtilis strain kps-11
A phosphobacterium isolated from the potato rhizosphere and used as the test strain in this work.
Aliases: KPS-11
- geniii micro-plate system
A phenotype microarray assay used to profile carbon-source utilization and chemical resistance.
Aliases: GENIII
- gluconic acid
An organic acid detected in the culture medium during phosphate-solubilizing activity.
- phosphate solubilization
The in vitro process by which the strain released soluble phosphate from insoluble calcium phosphate.
Aliases: P-solubilization
- phytate mineralization
The in vitro breakdown of Na-phytate by the strain, measured through phytase activity.
Aliases: phytase activity
- potato inoculation
The experimental application of the bacterial strain to potato plants to assess growth promotion.
- rhizosphere colonization
The persistence of the rifampicin-resistant derivative on potato roots and in surrounding soil over time.
- β-propeller gene
The phytase-encoding β-propeller gene identified in strain KPS-11 and compared with known Bacillus sequences.
Aliases: BPP
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