Coleoptile elongation and seed germination assays (Chutima
and Lumyong, 2012; Kumla et al., 2014) were used to investigate
the biological activity of crude fungal IAA. Crude fungal IAA was
dissolved in 0.5 ml of 0.1 N NaOH, then diluted with 40 lg mL1
of sterile distilled water before use. An IAA standard stock solution