Research Article
Characterisation of the Endophytic and Rhizospheric Bacillus licheniformis Strains Isolated from Sweet Potato with Plant Growth-Promoting and Yield Enhancing Potential
Figure 4
IAA production of the B. licheniformis strains on solid YEG media amended with L-tryptophan. The ability to produce IAA was confirmed by the pink halo zone around the colonies.