Production of the phytohormone Indole Acetic acid by some rhizospheric bacteria associated with the Egyptian flora
Ghada E. Dawwam ,Manar H. Fathy, Tamer M. Emam, Mohamed O. Abdel-Monem, Radwan Khalil, Aziza Naga
Indole acetic acid (IAA) is a phytohormone that regulates plant growth and development via cell elongation, cell enlargement, and cell division. IAA is synthesized both in plants and microorganisms. For microorganisms, the production of phytohormone IAA is one of the essential criteria for plant growth promotion. The present work involves the isolation of bacteria from the rhizosphere of different localities of the Egyptian flora and screening these isolates for the production of Indole acetic acid. Thirty-three bacterial isolates were obtained from clay and sandy soils. 67% of bacterial isolates were obtained from clay soil while 33% were obtained from sandy soil. The isolated bacteria produced a high amount of IAA in the range of 6.36 and 62.59 μg /ml. Thus, these bacteria are recommended as sustainable biofertilizers for their high production of IAA.