Oil-oxidizing potential of associative rhizobacteria of the genus Azospirillum

The oil-oxidizing potential of associative rhizobacteria of the genus Azospirillum was studied under laboratory conditions. After screening, A. brasilense strain SR80 was chosen for further investigation. The strain was capable of degrading 56.5% of crude oil (added in a concentration of 1%) over 14 days in a medium containing malate as an additional source of carbon and energy. Studies of associative properties showed that the strain had positive chemotaxis to wheat root exudates, colonized wheat roots, and produced indole-3-acetic acid. The synthesis of indole-3-acetic acid was not inhibited by oil. Under hydroponic conditions, crude oil stimulated growth of A. brasilense SR80, which promoted development of the wheat root system in the presence of oil and enhanced the level of oil degradation by the plant-microbial association.__________Translated from Mikrobiologiya, Vol. 74, No. 2, 2005, pp. 248–254.Original Russian Text Copyright © 2005 by Muratova, Turkovskaya, Antonyuk, Makarov, Pozdnyakova, Ignatov.