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Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI
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Rezumat: Bacillus marisflavi has the ability to grow at extreme conditions such as high salt, temperature and pH. In the present study, we isolated Bacillus marisflavi K7SpZMAO002 from the rhizhosphere of Spinifex littoreus, a Coastal Sand Dune (CSD) pioneer grass present at the foredune of Keri beach, Goa-India. The foredune of CSD is constantly affected by salt spray and is also under constant tidal effect, due to which it is a potential source of halophilic bacteria. During this study it was discovered that Bacillus marisflavi K7SpZMAO002 exhibits potential plant growth promoting attributes such as solubilization of inorganic phosphate at alkaline pH, production of indole-3-acetic acid, siderophore, exopolysaccharide (EPS), 1-aminocyclopropane-1-carboxylate (ACC) deaminase and antifungal activity against phytopathogens. Seed germination and seedling development of cowpeas (Vigna unguiculata) bacterized with Bacillus marisflavi K7SpZMAO002 exhibited 30% higher vigor index than the control seeds without inoculum. The in-vitro studies of bio-inoculum on cowpea seeds in salt-affected coastal sand revealed 45% and 22% higher vigor index than negative (without inoculum) and positive (commercial biofertilizer) control, respectively. Bacillus marisflavi has the potential of increasing the growth of plants under the saline conditions and could be successfully used as biofertilizer in areas of high salinity where their non halophilic counterparts used in biofertilizer formulations might not be effective.
Keywords: Bacillus marisflavi, biofertilizer, coastal sand dune. |
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