WHEAT GROWTH PROMOTING TRAITS OF FREE NITROGEN FIXING BACTERIA OBTAINED FROM A FIELD IN KERMAN DISTRICT

Background and Aim:Application of biofertilizers, especially nitrogen fixing bacteria, is one of the most important plant nutrition strategies for sustainable agriculture. Accordingly, the use of biofertilizers containing plant growth-promoting rhizobacteria (PGR), has been strongly considered recently.Methods:Nitrogen fixation tests, phosphate and zinc solubilization, indole acetic acid test, hydrogen cyanide production, ammonia production, nitrogen reduction, and resistance to salinity and temperature tolerance were checked about all isolated bacteria.Results:In this research, after sampling of wheat plant, 17 bacteria were identified and named with the codes as IAUK3011-3027. They all could grow from 5 to 43oC, salt tolerance was observed from 0.5 to 5%, and growth was from 4 to 8% NaCl. Pot experiment was performed about three rhizobacteria as 3018, 3021 and 3023 with three replications. Based on the results, it was found that stem length, root length, fresh and dry weight of the stem, and fresh and dry weight of the roots were significantly affected by isolated rhizosphere bacteria positively.Conclusion:The findings indicate that the selected rhizobacteria can be considered as putative alternatives for chemical fertilizers with potential to increase the growth of wheat or may be other plants.

کلیدواژه ها:

Wheat ، Nitrogen fixation ، Plant Growth promoting rhizobacteria ، pot experiment