Bacteria mediated reclamation of Arsenic induced biochemical injuries in maize plant

Plant Science

Arsenic is the ubiquitous toxic metalloid causing severe hazard in crop production. Contaminated groundwater used in irrigation causing increase soil Arsenic level and ultimately move in the food chain through crop in several parts of West Bengal. Present study was conducted for authenticating the potentiality of a naturally occurring arsenic tolerant bacteria for utilizing arsenic induced stress management in the maize cultivation. Here, chlorophyll a and chlorophyll b contents showed significant reduction on exposure of arsenic that can be attributed to the earlier report where heavy metal inhibits biosynthesis of chlorophyll and leading to senescence. Lipid peroxidation ability of the leaf tissues increased on the stressed plants even more than control in the bacteria treated experimental sets. Both the stress induced antioxidant defense system indicators of the plant tissue, i.e. peroxidase or enzymatic antioxidant and secondary metabolites (polyphenolic compounds) were higher in the arsenic treatment. As observed in the bacterial treatment set, those stress indicators were significantly lowered. Therefore it might be considered to explain the fact that application of bacteria might be able to accumulate the arsenic components from soil, thereby cleanse the environment for a stress-free growth of the potted maize plants. Thus, current study directed the application of A10 bacterial strain for possible protection of the experimented maize plant from the arsenic induced biochemical injuries.

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