Isolation and Identification of Arsenic Hyper-Tolerant Bacterium with Potential Plant Growth Promoting Properties from Soil

The soil and groundwater of the Bhagobangola I block Murshidabad district, West Bengal, India is severely arsenic-contaminated. A bacterium was isolated from garden Mahishasthali village, which could tolerate 36.49 mM arsenic (III), 280.44 (V) 63 chromium makes it (III V) (III) hyper-tolerant bacterium. growth pattern this does not show much alteration in presence 10 emphasizing its resistance to these heavy metals. Scanning electron microscopic analysis depicted be rod-shaped with a size ~1.45 µm. 16S rDNA sequencing, followed by subsequent phylogenetic analysis, established identity as Microbacterium paraoxydans. This capable bioremediation showed 30.8% 35.2% for 1mM 22.6%, 30.5% 4mM arsenite, over period 24 48 h, respectively. paraoxydans also exhibits potential plant growth-promoting properties such nitrogen fixation, phosphate solubilization, indole-3-acetic acid production siderophores. Therefore, metal resistance, utilized only reduction toxicity but promotion.