Optimization Studies on Gibberellic Acid Production by Fungal Strains Isolated from Chilli Rhizosphere

Author(s): Darsi Phebe Sarah Koti Ratnam*

Abstract: A total of 10 fungal strains were isolated from the chilli rhizospheric soils collected from in and around the Guntur, Andhra Pradesh, India. All the ten strains were observed for the gibberellic acid production. Among them the strain DS5 showed maximum gibberellic acid production of 45.8 μg/ml. environmental factors like incubation period, pH and temperature were observed for gibberellic acid production. Maximum production was recorded at 96 h of incubation and pH 8.0 at 40⁰C. Carbon and nitrogen sources greatly influenced the gibberellic acid production. Among them sucrose and yeast extract influenced the maximum gibberellic acid production. Results reveals that the fungal strain DS5 was proved to exhibit the best plant growth promoting characterises and it was suggesting for sustainable agriculture.

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