Production of the phytohormone Indole Acetic acid by some rhizospheric bacteria associated with the Egyptian flora

Dawwam, Ghada E.; Fathy, Manar H.; Emam, Tamer M.; AbdelMonem, Mohamed O.; Khalil, Radwan; Nagah, Aziza

doi:10.21608/jbes.2023.372265

Production of the phytohormone Indole Acetic acid by some rhizospheric bacteria associated with the Egyptian flora

Document Type : Original Article

Authors

¹ Botany and Microbiology Department, Faculty of Science, Benha University, Benha, 13518, Egypt.

² Soil Fertility and Microbiology Department, Water Resources and Desert Soils Division, Desert Research Center, El-Matariya, Cairo 4540031, Egypt.

³ Botany and Microbiology Department, Faculty of Science, Benha University, Benha, 13518, Egypt

10.21608/jbes.2023.372265

Abstract

The phytohormone indole acetic acid (IAA) is synthesized both by plants
and microorganisms. This phytohormone performs its activity on plant growth and
development by regulating cell elongation, enlargement, and division. The production of
IAA is one of the essential criteria that discriminate the plant growth-promoting
microorganisms. 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.

Keywords