Isolated bacteria from saline-sodic soils alter the response of wheat under high adsorbed sodium and salt stress

Soleimani, R.; Alikhani, H.; Towfighi, H.; Khavazi, K.; Pourbabaee, A.
January 2017
International Journal of Environmental Science & Technology (IJE;Jan2017, Vol. 14 Issue 1, p143
Academic Journal
This investigation was carried out for evaluation of indole-3-acetic acid production by bacteria under salinity and salinity-sodicity stress. A total of 298 bacteria were isolated from soils with different levels of electrical conductivity and sodium adsorption ratio. Then, ability of indole-3-acetic acid production under salinity, salinity-sodicity and l-tryptophan concentrations was analyzed. The results indicated that the ability of growth and indole-3-acetic acid production among bacteria was significantly affected by salinity, salinity-sodicity and l-tryptophan concentration. The one of the bacterial species, Arthrobacter siccitolerans, that were isolated from saline-sodic soils can adjust its indole-3-acetic acid production to different levels of salinity and salinity-sodicity stress conditions. Also, its l-TRP use efficiency under salinity-sodicity stress was 5.01% and reported as the most efficient bacterium. Seed inoculation of A. siccitolerans enhanced wheat aerial and root dry matter under salinity-sodicity stress with respect to control by 10.03 and 15.17%, respectively. The study indicates the different effects of salinity-sodicity on indole-3-acetic acid indole-3-acetic acid production and the potential of A. siccitolerans for production of indole-3-acetic acid and enhancing growth of wheat under salinity and salinity-sodicity stress.


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