Phosphate solubilizing bacteria (PSB) are beneficial bacteria capable of solubilizing inorganic phosphorus from insoluble compounds. P-solubilization ability of rhizosphere microorganisms is considered to be one of the most important traits associated with plant phosphate nutrition. It is generally accepted that the mechanism of mineral phosphate solubilization by PSB strains is associated with the release of low molecular weight organic acids, through which their hydroxyl and carboxyl groups chelate the cations [an ion that have positive charge on it.] bound to phosphate, thereby converting it into soluble forms. PSB have been introduced to the Agricultural community as phosphate Biofertilizer. Phosphorus (P) is one of the major essential macronutrients for plants and is applied to soil in the form of phosphate fertilizers. However, a large portion of soluble inorganic phosphate which is applied to the soil as chemical fertilizer is immobilized rapidly and becomes unavailable to plants. Currently, the main purpose in managing soil phosphorus is to optimize crop production and minimize P loss from soils. PSB have attracted the attention of agriculturists as soil inoculums to improve the plant growth and yield. When PSB is used with rock phosphate, it can save about 50% of the crop requirement of phosphatic fertilizer. The use of PSB as inoculants increases P uptake by plants. Simple inoculation of seeds with PSB gives crop yield responses equivalent to 30 kg P2O5 /ha or 50 percent of the need for phosphatic fertilizers. Alternatively, PSB can be applied through fertigation or in hydroponic operations. Many different strains of these bacteria have been identified as PSB, including Pantoea agglomerans (P5), Microbacterium laevaniformans (P7) and Pseudomonas putida (P13) strains are highly efficient insoluble phosphate solubilizers. Recently, researchers at Colorado State University demonstrated that a consortium of four bacteria, synergistically solubilize phosphorus at a much faster rate than any single strain alone. Mahamuni and Patil (2012) isolated four strains of phosphate solubilizing bacteria from sugarcane (VIMP01 and VIMP02) and sugar beet rhizosphere (VIMP03 and VIMP 04). Isolates were strains of Burkholderia named as VIMP01, VIMP02, VIMP03 and VIMP04. VIMP (Vasantdada Sugar Institute Isolate by Mahamuni and Patil) cultures were identified as Burkholderia cenocepacia strain VIMP01 (JQ867371), Burkholderia gladioli strain VIMP02 (JQ811557), Burkholderia gladioli strain VIMP03 (JQ867372) and Burkholderia species strain VIMP04 (JQ867373)6].
Labrys soli is a Gram-negative, strictly aerobic, non-motile, non-spore-forming bacteria from the family Xanthobacteraceae which has been isolated from the rhizosphere of a ginseng plant.
Chryseobacterium ginsengisoli is a Gram-negative, strictly aerobic and non-motile bacteria from the genus Chryseobacterium which has been isolated from the rhizosphere of a ginseng plant.
Microbacterium barkeri is a bacterium from the genus Microbacterium which has been isolated from domestic sewage and from smear from a cheeses. Microbacterium barkeri has the ability to degrade polyvinyl alcohol.
Microbacterium ginsengisoli is a Gram-positive, heterotrophic, strictly aerobic bacterium from the genus Microbacterium which has been isolated from soil from a ginseng field in Daejeon, South Korea.
Microbacterium ginsengiterrae is a Gram-positive, heterotrophic, strictly aerobic and non-motile bacterium from the genus Microbacterium which has been isolated from soil from a ginseng field in Korea.
Microbacterium marinum is a Gram-positive and rod-shaped bacterium from the genus Microbacterium which has been isolated from seawater from the South-West Indian Ocean.
Microbacterium murale is a Gram-positive bacterium from the genus Microbacterium which has been isolated from an indoor wall in Giessen in Germany.
Microbacterium natoriense is a Gram-positive and rod-shaped bacterium from the genus Microbacterium which has been isolated from soil from Natori in Japan. Microbacterium natoriense produces D-aminoacylase.
Microbacterium neimengense is a Gram-positive, non-spore-forming, rod-shaped and non-motile bacterium from the genus Microbacterium which has been isolated from rhizosphere of a maize-plant in China.
Microbacterium paraoxydans is a Gram-positive bacterium from the genus Microbacterium which was first isolated from the fish Nile tilapia in Mexico. This bacterium can cause disease in fish. Microbacterium paraoxydans metabolize (RS)-mandelonitrile to (R)-(-)mandelic acid. Microbacterium paraoxydans is a plant growth-promoting bacteria.
Microbacterium petrolearium is a Gram-positive, rod-shaped and aerobic bacterium from the genus Microbacterium which has been isolated from oil-contaminated water from the Dagang Oilfield in China.
Microbacterium rhizomatis is a Gram-positive and rod-shaped bacterium from the genus Microbacterium which has been isolated from the rhizome of a ginseng root from the Hwacheon mountain in Korea. Microbacterium rhizomatis produces β-glucosidase.
Microbacterium soli is a Gram-positive, aerobic, rod-shaped and non-motile bacterium from the genus Microbacterium which has been isolated from soil from a ginseng field in Daejeon, South Korea.
Microbacterium thalassium is a bacterium from the genus of Microbacterium which has been isolated from the rhizosphere from mangrove trees on Japan.
Aeromicrobium panaciterrae is a Gram-positive, strictly aerobic, rod-shaped, and non-spore-forming bacterium from the genus Aeromicrobium which has been isolated from soil from a ginseng field in Pocheon, Korea.
Rhodanobacter panaciterrae is a Gram-negative, aerobic, non-spore-forming and non-motile bacterium from the genus of Rhodanobacter which has been isolated from soil from a ginseng field from Liaoning in China.
Rhodanobacter rhizosphaerae is a Gram-negative, aerobic, non-spore-forming and non-motile bacterium from the genus of Rhodanobacter which has been isolated from rhizospheric soil of a ginseng plant from Geumsan in Korea.
Phenylobacterium panacis is a Gram negative and rod-shaped bacterium from the genus of Phenylobacterium which has been isolated from the rhizosphere of a ginseng plant from the Hwacheon mountain in Korea.
Terrimonas rhizosphaerae is a Gram-negative, strictly aerobic and non-motile bacterium from the genus of Terrimonas which has been isolated from isolated from rhizospheric soil from a ginseng field from Geumsan in Korea.
