Abstract
Microbial scavenging of soil contaminants is one of the benign ways of turning such soils into cultivation. In this study , as many fifty isolates were isolated from vermiwash and screened for plant growth promotion (PGP), biocontrol attributes and hexavalent chromium Cr (VI) tolerance. Out of 50 bacterial isolates, three isolates were identified as Pseudomonas luteola (Vi1), Pseudomonas aeruginosa (Vi2) and Bacillus tequilensis (Vi4) which showed strong PGP properties such as phosphorus, potassium and zinc solubilization. The isolates Vi1 and Vi2 exhibited higher phosphorous solubilization quantified in range of 317-487 µg/ml. Zinc solubilization estimates of Vi1 and Vi2 were 14- 75 µg/ml, respectively .The isolates, Vi2and Vi4 displayed the antagonistic property against two pathogens viz., Ceratocystis fimbriata (MTCC 2281) and Fusarium oxysporum (MTCC 284), evident from their respective reduced growth by 51% and 46%. The other two test strains, Vi1and Vi2 showed consistent growth in nutrient agar amended with 200 ppm Cr (VI). These observations indicate that vermiwash has beneficial microbes and it can be used for polluted Cr (VI) environment or bioremediation in addition to PGP and biocontrol action.
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