Year: 2018 | Month: June | Volume 11 | Issue 3
Biosynthesis of Phytohormones by Potassium Solubilising Bacteria Isolated from Banana Rhizosphere
DOI:10.30954/0974-1712.06.2018.11
Abstract:
Phytohormones regulate plant growth in different stages of plants and occur in very low concentrations. Phytohormones are mainly signal molecules involved in cell elongation, apical dominance, tissue differentiation and cell division. Phytohormones can induce several reactions and based on the reactions they are divided into auxin, cytokinin , gibberellin , ethylene and abscisic acid. Production of phytohormones are not only associated with plants, occurrence of phytohormones are also involved with microorganisms mainly beneficial rhizobacteria. Rhizosphere microorganisms are naturally occurring beneficial bacteria which colonize the plant roots and promotes growth by enhancing nutrient availability and producing plant growth promoting substances. Potassium solubilizing bacteria are also rhizospheric microorganisms which produce different phytohormones. The present study has taken up to investigate the production of phytohormones by the potassium solubilizing bacteria isolated from banana rhizosphere. All the six isolates showed good amount of phytohormone production. Among the six KSB isolates, isolate SAF showed highest amount of cytokinin production, whereas SAM showed maximum content of gibberelic acid and SBF showed maximum IAA production. Hence, the present study indicates that potassium solubilizing bacteria which solubilizes insoluble potassium from the soil also have the capacity to produce phytohormones which can promote plant growth.
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