Plant growth promoting potential of pseudomonas sp. SP0113 isolated from potable water from a closed water well

Abstract

The Pseudomonas sp. SP0113 strain from a partially closed aquatic environment was identified as a plant growth promoting bacterium (PGPB). Laboratory tests revealed that PS0113 has multiple plant growth promoting traits, including mineral phosphate solubilizing ability, ammonifying ability that increases nitrogen availability for plants via the root system, and phosphatase activity that plays an important role in organic phosphorus mineralization. Tricalcium phosphate (Ca3(PO4)2) solubilizing ability was described as average (2-3 mm) after 7 days of incubation and as high (>3 mm) after 14 days of incubation. The analyzed bacterium was an antagonist of major crop pathogenic fungi. A high degree of pathogen growth inhibition was reported with regard to Rhizoctonia solani (38%), whereas the tested strain's ability to inhibit the growth of fungi of the genera Fusarium and Microdochium nivalis was somewhat lower at 20-29%. The bacterium proliferated in Roundup 360 SL solutions with concentrations of 0.1, 1 and 10 mg•ml-1.

Keywords

• PGPB
• plant growth promoting bacterium
• Pseudomonas sp.
• biocontrol
• glyphosate-tolerant bacterium