Er, FKilic, MBrohi, AROgut, M2020-03-262020-03-2620040002-1857https://hdl.handle.net/20.500.12395/19137Azospirillum co-inoculation with the wild type Rhizobium strains increased the nodulation and growth in bean plants compared to plants inoculated with Rhizobium alone. The two genetically modified bacteria were producing strain, R. etli TFX, with enhanced competitiveness and a sodium azide A trifolitoxin resistant strain, R. etli CFN030, with nitrogen fixation ability. The objective of this study was to test whether the Azospirillum co-inoculation with either genetically modified rhizobial strain affects plant growth. A completely randomized pot experiment with 5 replications was conducted. The plant growth medium was a mixture of soil, sand, and perlite. Five plants were each harvested at 15, 30, and 45 days after inoculation (DAI). There was not a significant difference in nodule number between treatments (p = 0.05). Nodules incited by R. etli CFN030 weighed more nodules incited by than the R. etli TFX. Azospirillum co-inoculation did not significantly change the nodule weights. The plants inoculated with R. etli CFN030 accumulated the highest root, shoot, and total weights at each sampling date except for root mass at 30 DAI There was significant difference in shoot and root N content between some bacterial treatments and control at 15 and 30 DAI, but this was less pronounced at 45 DAI Azospirillum co-inoculation effect on nodulation and plant growth of bean is not as straightforward for the genetically engineered rhizobia as it is for wild type rhizobia.eninfo:eu-repo/semantics/closedAccessArticle4803.04.2020124131Q4WOS:000233142600005Q4