Exploring of Biosurfactant Producing Bacterial Isolates Combined with Plant Growth Promoting Activities

Author: Arati, Tamilvendan, K., G. Selvakumar, P. S. Benherlal, N. Earanna and Y. A. Nanja Reddy

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Abstract

The biosurfactants are the pool of secondary metabolites that are bounteously extravasated by multifarious microorganisms either extracellularly into the culture broth or anchored to the cell surface where from they are released. These biosurfactants are engrossed in crop growth and improvement as an appealing alternative to synthetic surfactants. There is paucity of information on biosurfactant having plant growth promoting activities. Hence, the present investigation was taken up to uncover the plant growth stimulating potential of efficient biosurfactant producers chosen after rigorous screening by qualitative and quantitative assays in particular oil spreading test, drop collapse assay, penetration assay, emulsification assay, bacterial adhesion to hydrocarbon (BATH) assay and surface tension reduction test. The seven bacterial isolates (BPB-17, BPB-34, BPB-48, BPB-49, BSB-18 and BSB-24) which were screened and selected from the previous study were evaluated for plant growth-promoting properties viz., PO4 solubilization, siderophore production, ammonia production, zinc and potassium solubilization, N2- fixation and ACC deaminase activity. Significant increases in plant growth-promoting traits were registered by isolate BPB-17 mainly phosphate solubilization (2.4 mg/L), ammonia production (1.98 mg/L) and K- solubilization (2.46 mg/L). While the isolate BPB-48 recorded significant siderophore production (76.88 %) and Zn solubilization (2.71 mg/L).

Keywords

Microorganisms, Biosurfactant, plant growth promoting potential, solubilization

Conclusion

Biosurfactants are amphiphilic compound that possesses the ability to reduce surface tension between solids, liquids, and gases interface in addition these are found to induce the production of plant growth-promoting substances. The present study illustrates the significance of biosurfactant producers screening for plant growth-promoting traits under in vitro conditions. These biosurfactant producers having a plant growth-promoting activity is an additional advantage for enhanced crop productivity in contaminated areas. The isolates BPB-17 and BPB-48 showed significant PGP activities and these isolates can be used for the inoculant development for enhancing crop growth and yield.

References

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How to cite this article

Arati, Tamilvendan, K., G. Selvakumar, P. S. Benherlal, N. Earanna and Y. A. Nanja Reddy (2023). Exploring of Biosurfactant Producing Bacterial Isolates Combined with Plant Growth Promoting Activities. Biological Forum – An International Journal, 15(7): 338-348.