Production and Metabolism of Indole Acetic Acid in Root Nodules and Symbiont (Rhizobium undicola) Isolated from Root Nodule of Aquatic Medicinal Legume Neptunia oleracea Lour.

Table 7

Effect of phenolic acids on growth and IAA production by the strain Rhizobium undicola with the most effective supplements. The pairwise comparison showed significant difference under different phenolic compounds, growth, and indole acetic acid production of the strain N37 and between their interactions.

Phenolic acid (0.5 μg/mL)	Growth OD at 540 nm	IAA production (μg/mL)
Control
Salicylic acid
Catechuic acid
Gallic acid
4-Hydroxybenzaldehyde
Ferulic acid

The vitamin sources were supplemented at 1 (μg/mL) level individually in the experimental sets for 24 h at 30 ± 2°C. Results presented are the mean of 3 individual experimental setups.