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Growth enhancement of maize by the use of selenium resistant bacteria under selenium stress


International Journal of Molecular Biology: Open Access
Hafiz Suboor ul Hassan,1 Anam,2 Mubashra Yasin,3 Muhammad Faisal2

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Abstract

Purpose: Heavy metal accumulation in environment is potentially creating problems to life especially to plants. Two selenium resistant bacteria, Bacillus pumils strain CrK08 and Bacillus licheniformis strain AsK03 were checked for their role in growth promotion of Zea mays in pot experiment under selenium stress. Methods: The two bacterial strains Bacillus pumils strain CrK08 and Bacillus licheniformis strain AsK03 were assessed for their ability to promote plant in pot experiment and growth parameters were measured. Results: Both strains significantly promoted root length (13%) in control and (51%) in autoclaved soil. Number of roots was reduced to 28% and 35% in control and autoclave soil respectively. Fresh weight and dry weight were reduced up to 2%, 1% and 28% and 25% in control and autoclave soil plants. In treated plants fresh weight was 35% and 16 % high than non-treated plants. Strains also produced an increase in soluble protein content. Indole acetic acid (IAA) content was enhanced to 10% and 65% while acid phosphatase activity was 13.3% and 50% lower in inoculated plants than respective controls. Peroxidase content reduced up to 2%. Selenium content in control plants was high as compared to treated plants. Conclusion: On the whole these strains promote plant growth under Se stress (17mg/kg) in soil.

Keywords

selenium resistant bacteria, heavy metal, Zea mays, biochemical parameters, selenium content in plant

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