Isolation and characterization of deleterious Pseudomonas aeruginosa KC1 from rhizospheric soils and its interaction with weed seedlings

The bacterial isolate KC1 was screened from the rhizosphere of castor plants (Ricinus communis) indigenous to agricultural fields of Bihar. The isolate was Gram negative, non-spore forming, and exhibited fluorescence under UV light. Its molecular characterization is based on the sequencing of 16S rDNA (1450bp) and alignment at GeneBank (NCBI, MaryLand). The strain has been validated as Pseudomonas aeruginosa (HM195190). The bacterium grew at 4–42°C, with a temperature optima of 30°C. The strain KC1 was found to produce cyanide (4.78nmoll−1) over a period of 36h. Data revealed enhanced cyanogenesis (6.98nmoll−1), when glycine was provided in the King’s B medium. Seed bacterization exhibited reduction in root length, shoot length of weed seedlings (Amaranthus spinosus, Portulaca oleracea), which was significant (p