Abstract:
Phosphate solubilizing bacteria (PSB) is a group of beneficial bacteria capable of solubilizing organic phosphate into inorganic phosphate and producing hormone that
enhances plant growth. Applications of PSB as biofertilizer agents can improve plant growth. The objective of this study was to screen the potential indigenus PSB isolated from peat soil in producing indole acetic acid(IAA). The PSB collection (152 isolates) were inoculated in Pikovskaya’s broth containing L-tryptophan as a precursor of IAA.
Furthermore, IAA produced by PSB was tested colorimetrically. The result indicated
that a number of 27 isolates were able to produce IAA, and isolate BB_K2 known
capable to produce the highest IAA concentration (65,33±6,10 ppm), whereas isolate
BB_K8 produced the lowest IAA concentration (2,75±0,65 ppm).
