Gibberellin and IAA Production by Rhizobacteria from Various Private Forest

Abstract

Rhizobacterium is a bacterium that colonizes plant roots, known to produce gibberellin and Indol Acetic Acid (IAA) to spur plant growth. This study aims to isolate rhizobacteria from various stands of community forest and to know the ability of rhizobacterial isolates to produce gibberellin and IAA. Research methods included rhizosphere soil sampling, bacterial isolation, gibberellin content test, and IAA. Results of rhizobacterial isolation were obtained by 35 isolates having a gibberellin production capability of about 1,959-4,322 mgl−1 and IAA about 0.389-2.370 mgl−1. The highest gibberellin production was obtained on the isolates of BB1, BB2 and BB3 while the highest IAA was in JS9 and JB4 isolates.

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