Effect of Azospirillum strains on regulation of chemical markers activity in corn (Zea mays L.) under water deficit condition

The Azospirillum strains effects that would present direct (nutrient supply) and indirect (reduction water deficit effects) in agricultural systems. We evaluated the relative of Azospirillum on two chemical markers such as Dityrosine (Di-TY) and Dihydroxy-guanozine (8-oH-dg) to control water deficit effects in corn (Zea mays L. var SC 704). We found significant differences among the different Azospirillum strains (A. lipoferum, A. brasilense and A. irakiens) to reduction markers activity. The optimum yield was produced in water deficit situation at inoculated treatments. Seed inoculation with Azospirillum in drought stress condition decreased content of oxidative damage by biomarkers (Dityrosine and Dihydroxy-guanozine). It indicated the positive effect of strains in reduction of drought stress effects. A. lipoferum, A. brasilense and A. irakiens significantly increased grain yield about 16.3, 12.9 and 8.2% and decreased markers activity about 11.1, 7.6 and 5.8% than un-inoculated (control) treatments at 12% soil moisture, respectively. It seems that inoculated plants scavenge produced free radicals under water deficit stress. These results suggest that Azospirillum strains notably influenced the markers activity at environmental stresses.