Integrated screening and bioformulation of plant growth–promoting bacteria for sustainable Agriculture
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Abstract
Plant growth-promoting microbes are isolated and screened for a total of ten representative isolates as the potential for ammonia, acetoin siderophore production, nitrogen fixation, and indole-3-acetic acid synthesis and phosphate solubilization. These isolates are identified as Streptomyces albido flavus KA18, Streptomyces spectabilis NBB36, Streptomyces nigra SAN20, Streptomyces violaceus SAN35, Brevibacillus borstelensis VERB6, Streptomyces rochei VCIB11, Bacillus licheniformis VCIB2, Paracoccus sanguinis VCOB5, Brevundimonas subvibrioides VCOB6, and Neotabrizicola shimadae VCOB8. All tested isolates exhibited the multiple actions which found to be strongly enhanced available plant nutrients for the growth of plants. These strains are found to be tolerance to potassium dichromate up to 1000 ppm which applicability under the contaminated soil conditions and abiotic stress. S. rochei VCIB11, S. spectabilis NBB36, S. violaceus SAN35, S. albidoflavus KA18 expressed antimicrobial activity against plant pathogen (Ralstonia solanacearum). Moreover, all selected strains are prove to be synergistic interaction with no antagonistic effects. It is supported their suitability for consortium-based formulations. The highlighted result is proved for the multifunctional potential of these strains to be an eco-friendly biofertilizer and bio-bacteriocide to decrease the toxic chemical contaminants in soil and water incorporated for decreasing heavy metals to revitalize soil and bioremediation.
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