Exploration of bacteria associated with chili peppers' rhizosphere and their capacity to absorb and produce gibberellin hormone

Abstract

Plant rhizospheric zone is a narrow soil region were rich in microbes. Microbes are of capacity to dissolve phosphate. Phosphate (P) is the second essential component after N, which plays a crucial part in photosynthesis and root development. P is difficult to dissolve due to strong bonding with compounds in the soil. Here, we explored rhizospheric bacteria around chili peppers' roots area. The bacteria were isolated and purified on solid media. The bacterial isolates were then quantitatively assayed for their capacity to dissolve phosphate using Pikovskaya liquid medium consisted of Ca3(PO4)2 as Phosphate source. Moreover, the capacity to produce Gibberellin hormone was also evaluated using Borrow et al. method. The assays revealed that phosphate concentration produced by rhizospheric bacteria of chili pepper ranged from 19.0 to 58.8 μg/L. Meanwhile, gibberellin concentration ranged from 5.81 - 12.79 μg/L. Our results present that bacteria inoculated from roots and roots area of chili pepper are potential as Plant Growth Promoting Bacteria.vThe first section in your paper.