Abstract
The connection between soil and microbes plays a critical role in soil health and quality and can be elastic with the application of soil amendments and/or crop rotations. Inappropriate management of soil and application of impermissible levels of fertilizers ruptures the overriding connection between the soil and microbes. This is currently evidenced in the degraded soils (i.e., saline soils of India) which are caused by modern agricultural practices. Reclamation of saline soils with a saturated package of practices and conventional breeding methods requires biological intervention. Shortfall of nutrients is one of the chief constraints for plant growth in salt-affected soils. In the present investigation, we have observed an arsenal of fifty halophilic bacteria carrying an absolute requirement of 3% NaCl for solubilizing the insoluble minerals (ZnCO3, ZnO, Mica and tri-calcium phosphate) under in vitro conditions; however, increasing the amount of NaCl over and above resulted in loss of solubilization capacity. Of the isolates solubilizing zinc carbonate and zinc oxide at 3% NaCl concentration, there were 29 isolates; at 10% concentration, 10 isolates were positive for the presence of zinc carbonate. At 3% NaCl concentration, HB-5 showed 23.16 mm zinc carbonate solubilization, HB-20 showed 13.3 mm Zinc oxide solubilization, and HB-7 showed 13.4 mm tri-calcium phosphate solubilization. Mica solubilization was peaked at 6% NaCl and maximum solubilization was observed in HB-27 (18.03 mm). When compared to the zinc carbonate solubilization, zinc oxide solubilization was slow to reach desired levels. Solubilization lasted for up to 9 days and ceased thereafter in all the tests. Eight elite isolates were identified as Bacillus albus, Bacillus safensis, Pseudomonas stutzeri (2), Lysinibacillus sphaericus, Staphylococcus xylosus, and Bacillus cereus (2) based on 16S rRNA analysis.
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Nagaraju, Y., Gundappagol, R.C. & Mahadevaswamy Mining Saline Soils to Manifest Plant Stress-Alleviating Halophilic Bacteria. Curr Microbiol 77, 2265–2278 (2020). https://doi.org/10.1007/s00284-020-02028-w
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DOI: https://doi.org/10.1007/s00284-020-02028-w