National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Zinc deficiency in agricultural soils significantly limits crop productivity, particularly in saline and coastal environments. The present study aimed to isolate, characterize, and evaluate zinc-solubilizing bacteria (ZSB) from salt-affected coastal soils of Gir Somnath district, Gujarat, India. A total of twenty morphologically distinct bacterial isolates were obtained from non-rhizospheric soil samples collected from four coastal locations using standard serial dilution and plating techniques. All isolates exhibited growth on zinc solubilizing agar medium and were identified as Gram-positive bacteria, indicating their adaptation to saline and metal-stress environments. Morphological characterization revealed diversity in colony size, shape, elevation, and pigmentation. Quantitative evaluation demonstrated strain-specific zinc solubilization under varying pH (5, 7, and 9), salt concentrations (1% and 2.5% NaCl), and temperatures (20 °C, 37 °C, and 50 °C). Several isolates, particularly KOZ-01, SAZ-08, SAZ-10, and MUZ-16, showed superior solubilization efficiency and tolerance to environmental stress. Biochemical characterization confirmed metabolic versatility, including catalase activity, citrate utilization, and carbohydrate fermentation. Molecular identification revealed similarity to genera such as Bacillus, Paenibacillus, and Enterobacter, known for plant growth-promoting properties. The findings highlight the potential of these stress-tolerant zinc-solubilizing bacteria as promising bioinoculants for improving zinc availability and enhancing crop productivity in saline and coastal agricultural soils.
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