DOI: 10.36347/sajb.2016.v04i09.008

Pages: 738-744

Cyanobacteria are diverse group of oxygenic photosynthetic prokaryotes. Indole 3 acetic acid is one of the major phytohormones for plant growth. To explore the Indole 3 Acetic Acid (IAA) production by cyanobacteria from saline soil 11 non-heterocystous cyanobacteria isolated from saline soil of Baramati region of Maharashtra. These isolates were evaluated for production of Indole-3-acetic acid in the presence of L-tryptophan. Out of 11 isolates, 9 isolates were able to produce IAA. Productivity of IAA was detected spectrophotometrically. IAA production of isolated cyanobacteria was evaluated in different pH, light photoperiods and various concentration of L-tryptophan, salt and nutrients. During 3 week incubation period TCC-1, TCC-4 and TCC-5 were producing higher amount of IAA (10.65µg/ml). TCC-1 and TCC-4 were found to produce higher amount (10.65µg/ml) of IAA in presence of 500,750 & 1000µg/ml of L-tryptophan concentrations. At pH 8, TCC-1 isolate was producing high amount (9.97µg/ml) of IAA. In the presence of light (24:00, L: D) conditions TCC-4 produces higher amount (9.42µg/ml) of IAA. In the presence of 200 mM and 400mM concentration of NaCl TCC-1, TCC-3 and TCC-4 produces IAA in higher amount respectively. Isolate TCC-5 was produces higher amount of IAA in presence and in absence of NaNO3. TCC-1, TCC-4 and TCC-5 cyanobacterial isolates were producing higher amount of IAA in optimized conditions.